Substance - May 03 2006Incandescent vs. CFL vs. LED Light Bulb Challenge
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For anyone out there dragging their feet about switching to Compact Fluorescent (CFL) or LED light bulbs in the home, we’ve put together some data about long-term usage in comparison to incandescent bulbs. As anyone paying attention has noticed, incandescent bulbs are rapidly becoming a thing of the past in terms of price, output, and performance. In an attempt to [forgive us, but we couldn’t pass it up] shed some light on the issue, we’ve crunched some numbers and put together an Excel sheet that compares various facets of incandescent, CFL and LED bulbs. Read the rest of our analysis after the jump, and feel free to download our Light Bulb Comparison Spreadsheet, which you can customize for your own home bulb comparisons. Next time you’re out looking for light bulbs for your home, consider your options and bear in mind a few factors that go into differentiating your options: individual bulb price, lifespan, lumens (brightness), and wattage/electricity cost (how much electricity it takes to light the bulb). Before you try to figure out which bulb you want to buy, consider what your goals are. Do you want to the longest-lasting bulb you can find? Do you want the most efficient bulb? Do you want to stop changing bulbs for 15 years? These days, there’s an option for each of these concerns.
Like we said, the incandescent bulb is a dinosaur. About the only thing it has going for it in comparison to more efficient and longer-lasting options is that the price of an individual bulb is still comparatively low. But if you use a little foresight, you’ll realize there are better options out there that cost just a little more. If you want a bulb that’s going to last for extended periods between replacements, you’ll want to go with the LED. The bulb features a lifespan of 60,000 hours versus the CFL’s 10,000 hours and the incandescent bulb’s 1,500 hours. Considering the bulb’s low energy expenditure, the cost (over its 60,000-hour lifespan) is significantly lower than either of the other bulbs. Simply put, if using as little energy as possible is your goal, the LED bulb is for you.
Of course, the standard LED is generally less bright than a traditional bulb. We tested the Spotlight LED bulb, which is made by the same manufacturer as the bulb we compared in our analysis (but with a lower lumen count), and we found it to have only a slightly less brightness than the traditional bulb. The LED also has the major drawback of featuring a very direct field of light, which makes it most useful only when aimed directly at what you want to light. Standard floor and table lamps equipped with an LED tend to offer streams of light aimed at the ceiling, which may not help with that book you're reading.
As a versatile bulb that burns comparably bright to a standard incandescent, but still costs less over the long term and burns more efficiently, the CFL Bulb may be your best bet. An advantage the CFL has over the LED is an upfront-cost that is considerably lower and far closer to the incandescent. In fact, if overall cost is your only concern, the cost of new LED bulbs may be more than you want to spend. Over the life of an LED, you are only going to see dramatic savings over the CFL if you are in an area that has high energy costs. For example, we compared LED and CFL bulbs at a standard $0.10 rate, and found that you would save about $11 over 60,000 hours. We also compared the two at $0.33 (what a friend pays) where the savings jumps to $120 over the life of an LED. While the CFL is twice as expensive as the incandescent upfront, the former buries the latter in a pile of long-term cost. Each individual setting—not to mention the user’s view’s on energy conservation—is going to call for a unique bulb. We’ve tried to give you basic data and tools to figure out which bulb is right for you. Download the Excel spreadsheet and consider the best options for you. Excel Sheet: LightBulb_Comparison.xls By: robert o'neill |
(NR) |
Compact Fluorescent bulbs are definitely the way to go! Not only are you going to save on your annual electric bill, but you will also lower your personal power waste. |
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Eric97 (1) |
That was a good attempt to compare LED light bulbs to CFL's to Incandescents. But the problem with LED lighting is that it is like comparing Apples to Oranges as the saying goes. Also the cost of the LED bulb used in the comparison ($54.95) really squews the results. Much better priced LED light bulbs can be found at DonsGreenStore.com . CFL's really are the only practical option currently available to adequatly replace regular light bulbs and save you some real money, both in energy and replacement bulbs. LED bulbs are really only good as small reading lights or night and saftey lighting. Or in a fixture where you don't need the light output of a normal bulb. Then and only then will they save you some real GREEN, with their 50,000 hour life and 1 watt to 3 watt power usage. In 10 years the results will be different as some really inproved LED's should be available in most Hardware stores. Just hage tight till then, or try some now for a taste of what is coming. |
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(NR) |
Alternative lighting systems are a good idea for general illumination, but the drive to ban incandescent bulbs is misguided. There are some troubles with the new lighting technologies intended to save energy: - Compact fluorescents burn out in about 6 months in motion-detector security lights. - Light dimmers don't work right with LED bulbs, unless at least one incandescent bulb is in the circuit. - Compact fluorescents burn out really fast if on a dimmer circuit. - None of the new technologies produces a flat spectral distribution. This makes them useless for spectrometry, colorimetry, and color matching. - None of the alternative lighting systems are usable for stage lighting. - Rock-band light-show systems won't work without incandescent lamps. |
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John F. (NR) |
"Also the cost of the LED bulb used in the comparison ($54.95) really squews the results. Much better priced LED light bulbs can be found at DonsGreenStore.com ." I just checked DonsGreenStore.com on your suggestion. Using the price of their LED lights, $54.95 is indeed skewed, but not in the direction you're thinking. Look at the lumen output of those LED bulbs. Their highest output bulb produces 90 lumens. A 75 watt incandescent puts out 1055 lumens. To produce the same amount of light, you'd have to install about 12 of those LED bulbs. That's $192.00, almost 4 times as high as the amount used in this comparison. One can't be faulted for missing that point. Their website doesn't go out of their way to point out that these are basically night lights. I'm sure they have a lot of disappointed customers. |
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Andy Clark (NR) |
I want to replace about a dozen 60 watt incandescent floods - some of which are on a dimmer switch - with CFLs. Any suggestions? Wattage, type, etc. |
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Adam M (NR) |
They have to be specially disposed of as CFL's (like their full sized counterparts) contain the highly toxic and ever unpopular mercury. Just throwing them away leaches mercury into ground water and obviously is not desireable, so in order to be truely "green" about it you need to make sure to dispose of them properly |
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Martin Reynolds (NR) |
The main problem with LED bulbs is that the wattage is say 9w but an CFL light is also 9w so what's the point With the CFL's you can tell the difference between a CFL and a normal light bulb but a LED's light is very sterlie and the range is no where near as strong also the intensity isn't there An LED will only project light in one direction so you need LED pointed in all directions Just get a torch with both an LED and normal bulb in it turn on the LED and then turn on the normal bulb notice the difference The LED light is cold sertile not very powerful or strong particulary when you are aiming it at an object and the light just shines on that object but with a normal bulb the light is soft strong powerful witha verygood beam on it also I can never see LED's replacing CFL as lighting devices as the very prinicles that make a LED a LED mean that it can never be used for general lighting It's very good for say tv's backlights brakes etc but not for general lighting |
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(NR) |
Thanks for the great article and spread sheet. We've been using CFLs exclusively for about the last 10 years. We just bought a couple of LED strips to use in areas we need a lot of focused light. In an off grid application the savings may be even larger that when paying by the kw as lower usage = smaller number of solar panel needs. We've been living off grid for 5 years and loving it. And we don't live in the dark. This message was composed using electricity generated by the sun. |
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(NR) |
There are two faults with CFL lights that haven't been adequately addressed. 1. CFLs (as everything else) are made in China and their quality control is not there yet (if ever). I bought four lamps - 2 from Ikea and 2 from Home Depot and one of each pair failed in less than one month. 2. Plans for disposal of dead CFLs are also not there yet and, without them, the only proper way is to take them to a hazzardous waste collection site. (Yeah, sure!) |
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Bruce Bennett (NR) |
Some points: A) CFL's don't do really cold temperatures very well (wait for the light... wait for it...) B) LED power supplies make or break the end product (and are the most likely failure point ) - LED's are a current-controlled DC device plugging into 120VAC power source, and C) my mouth is full of mercury (fillings are safe... aren't they?) |
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Jeanette H (Oregon) (NR) |
LED technology for replacing incandescents and CFLs is still a few years off. Let's just be patient--remember how CFLs started off with the slow flicker and awful color rendering? Now they're all across the color spectrum, some are dimmable, many are instant-on, and some are even suitable for outdoors now. Time is all that is needed-- folks are working on LEDs as the new incandescent for a fraction of the CFL wattage. Light OUTPUT or lumens is what needs to be comparable between the CFLs and the LEDs. Stay tuned... |
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(NR) |
LED bulbs are actually still quite hard to find since they haven't been readily adopted. They can't replace general lighting applications because of the fact that they give out directed light. However, for what they do - there are niche applications that they can be used for right now. i.e. decorative lighting, spot lighting, accent lighting I've been doing research and they DO sell LED bulbs now that can replace a 100W halogen bulb but these bulbs cost $100 EACH. I don't know how badly you want to save money, but $100 is too steep for me. What do you guys think? You can also buy LED bulbs on Ebay for cheap (not the $100 bulbs) but quality is inconsistent. Here's a good site I found that has a decent selection, isn't overpriced and has a 3 year warranty: LED Light Bulbs |
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Jeff (NR) |
Oops, bad link.Here's a link to one of the better sites for buying LED light bulbs. here '>Buy LED Light Bulbs |
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(NR) |
Comparisons between LED Light Bulbs and other lighting types are also made onhereIt is a research site, covering advantages, disadvantages, environmental benefits, applications, manufacture, sale and distribution. |
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(NR) |
I have also changed all the bulbs with the LED, which are also called energy savers. the output of light is definitely less than the old bulbs, but I can still do my work in this light. |
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(NR) |
i think my products are cheaper and better quality, anyone who wants buy please contact me. |
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(NR) |
I run a company that is focused strictly on LED Lighting. This technology has come a long way in the past few years. We now offer bulbs that are the best quality and most efficient in the marketplace today. Check us out save money and the environment. |
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Ally (NR) |
"Some points: A) CFL's don't do really cold temperatures very well (wait for the light... wait for it...) B) LED power supplies make or break the end product (and are the most likely failure point ) - LED's are a current-controlled DC device plugging into 120VAC power source, and C) my mouth is full of mercury (fillings are safe... aren't they?) " no, silver fillings are NOT safe. |
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Justin Thomas (NR) |
It looks like there are finally some products out there that could give traditional incandescents and CFL's a run for their money. Check outherethey have a direct replacement for a 100watt spotlight. |
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(NR) |
Contrary to a previous post, I feel CFLs do just fine in the cold. Ours just braved a Chicago winter w/ some extremely low temps. True, they take a little longer (a whole minute! <--sarcasm) to reach full brightness when extremely cold--but studies have shown that the boogie man takes a full three minutes to materialize-- thus rendering you far from any real danger. |
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(NR) |
Our company offers LED bulbs that are priced to compete in todays market. PAR 20's @ $22.50 Go to www.hendersonwholesalelamps.com |
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Michael (NR) |
I agree that to be a true comparison you have to provide the same amount of light across the board. Otherwise I could just buy luminescent paint and beat them all. |
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hypervisionaryrealm (1) |
This is going too far for legislation to tell WHAT you can install? There is nothing that beats the WARMTH of the yellow light spectrum of EDISION bulbs. Your not going to find too many eateries switching. people expect and want warm aesthetics while dining. I am for energy conservation. But so far the EDISION cannot be beat. Yes stage productions, (any) movie theathers, resturants, retailers.(at least quality ones) never use these! The LED's are AWESOME.... if they can get them brighter and difussed - and the cost down - they will be great........And the real problem with CFL's??It is not just the coldness. The stark cold light. And not only the eye strain, or the hum...here is what most forget.......but once they are reminded of it..The CFL vibration upon your pitutiary gland is WHAT CAUSES THOSE ENDLESS HEAD ACHES. The real reason many people detest Florescent lighting! The lighting is stark, and mess's with the natural aura and vibration of the function of the human being. They may be "green". But for earthy holistic spiritually sensitive people,( and really the majority of people period hate Florescent lighting!) CFL's are NOT the way to go! |
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Michael Chugg (NR) |
Watch out for the unscrupulous bulb sellers on this website!!! Lumens are the only measure of light intensity and the LEDS are typically 1/4th to 1/5 th as bright as regular bulbs. You will spend a lot of money for very little light, even if you do save on energy costs. These lights will put you back in the days of candles!! |
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(NR) |
On average it takes 8-12 years for an equivalent LED to break even with the cost of using CFLs. This includes the cost of the replacement CFLs every 2-4 years or so (which is sooner than they should need to be replaced). This is largely because LED lights are so dim, that the truly 75W equivalents run in the $40/bulb range. This is compared with $2.50/CFL. Despite what you might hear the cheaper LED lights do NOT produce 75W worth of light. |
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k west (NR) |
Led's are nearly 30 times more efficient than incandescent. Incandescent lights are 12% energy efficient and florescent no more that 18% and are toxic waste. Most of the energy used by them goes to heat. LED’s will pay for themselves in less than a year maybe in a few months depending on your use. They are bright. I have a led work light that is blinding if you look at it directly. They are using them as head lights in cars and motorcycle and the rest of the auto bulbs, backup, turn signal etc. http://www.theautochannel.com/news/2003/04/28/160176.html LED will replace Incandescent and florescent in the next 10 years. Congress signed a bill phasing out Incandescent in the next 4 to 12 years, If everyone had LED bulbs we would be able to shut down power plants. New white LED http://advancedfuturetechnology.blogspot.com/2007/12/100-lumenswatt-led-bulbs.html 120 v LED’s http://www.ccrane.com/lights/led-light-bulbs/index.aspx Auto and motorcycle LED’s http://www.lightlens.com/ledbulbs.htm Phase out of Incandescent http://www.environmentalleader.com/2007/12/18/us-energy-bill-phases-out-incandescent-light-bulb/ The problem is typical. The light bulb makers do not want to sell LED’s. You make money by selling bulbs, continuously. Power companies do not like LED’s, you replace all your bulbs and you will use on the average a 1/30 of the energy used. So the big money has been fighting LED’s for decades, hence the high price. Is GE and Westinghouse making LED bulbs, not that I am aware off because there is not enough money it! They are trying to make efficient florescent bulbs, there is more money it they break easily. It has taken the Congress to get LED’s out there. |
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k west (NR) |
Led's are nearly 30 times more efficient than incandescent. Incandescent lights are 12% energy efficient and florescent no more that 18% and are toxic waste. Most of the energy used by them goes to heat. LED’s will pay for themselves in less than a year maybe in a few months depending on your use. They are bright. I have a led work light that is blinding if you look at it directly. They are using them as head lights in cars and motorcycle and the rest of the auto bulbs, backup, turn signal etc. http://www.theautochannel.com/news/2003/04/28/160176.html LED will replace Incandescent and florescent in the next 10 years. Congress signed a bill phasing out Incandescent in the next 4 to 12 years, If everyone had LED bulbs we would be able to shut down power plants. New white LED http://advancedfuturetechnology.blogspot.com/2007/12/100-lumenswatt-led-bulbs.html 120 v LED’s http://www.ccrane.com/lights/led-light-bulbs/index.aspx Auto and motorcycle LED’s http://www.lightlens.com/ledbulbs.htm Phase out of Incandescent http://www.environmentalleader.com/2007/12/18/us-energy-bill-phases-out-incandescent-light-bulb/ The problem is typical. The light bulb makers do not want to sell LED’s. You make money by selling bulbs, continuously. Power companies do not like LED’s, you replace all your bulbs and you will use on the average a 1/30 of the energy used. So the big money has been fighting LED’s for decades, hence the high price. Is GE and Westinghouse making LED bulbs, not that I am aware off because there is not enough money it! They are trying to make efficient florescent bulbs, there is more money it they break easily. It has taken the Congress to get LED’s out there. |
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k west (NR) |
Led's are nearly 30 times more efficient than incandescent. Incandescent lights are 12% energy efficient and florescent no more that 18% and are toxic waste. Most of the energy used by them goes to heat. LED’s will pay for themselves in less than a year maybe in a few months depending on your use. They are bright. I have a led work light that is blinding if you look at it directly. They are using them as head lights in cars and motorcycle and the rest of the auto bulbs, backup, turn signal etc. http://www.theautochannel.com/news/2003/04/28/160176.html LED will replace Incandescent and florescent in the next 10 years. Congress signed a bill phasing out Incandescent in the next 4 to 12 years, If everyone had LED bulbs we would be able to shut down power plants. New white LED http://advancedfuturetechnology.blogspot.com/2007/12/100-lumenswatt-led-bulbs.html 120 v LED’s http://www.ccrane.com/lights/led-light-bulbs/index.aspx Auto and motorcycle LED’s http://www.lightlens.com/ledbulbs.htm Phase out of Incandescent http://www.environmentalleader.com/2007/12/18/us-energy-bill-phases-out-incandescent-light-bulb/ The problem is typical. The light bulb makers do not want to sell LED’s. You make money by selling bulbs, continuously. Power companies do not like LED’s, you replace all your bulbs and you will use on the average a 1/30 of the energy used. So the big money has been fighting LED’s for decades, hence the high price. Is GE and Westinghouse making LED bulbs, not that I am aware off because there is not enough money it! They are trying to make efficient florescent bulbs, there is more money it they break easily. It has taken the Congress to get LED’s out there. |
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(NR) |
A theater I work for recently bought 20 PAR can lighting units that run with LEDs. We've found that the light is a little less intense thrown over long distances, but not by much... where we used to hang 4 Pars per pipe for a full stage wash we now hang 5... but the savings on electricity and on gels are both huge. (The new Pars use DMX color mixing so we never need to buy "gel" color for these lights again.) The color light coming out of these (when pure light is the goal) is MUCH closer to white than our older PAR cans. And the icing on the cake is that these don't get hot, so you don't burn yourself when focusing when they've been on a lot. CFLs have never been an option for theatrical lighting because of their inability to dim accurately and predictably. We've been really excited about this new technology. |
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Ann Kaarlela` (NR) |
I have antique fixtures in my house with Edison sockets. I can't find an attractive LED or CFL bulb. There is an attractive candelabra type LED bulb which I can't use (socket is wrong) and in any case it's seems to be only a Christmas tree light with 1 watt. We are only going to save approximately 1 per cent of the electricity we now use by banning the use of incandescents (light bulbs account for only 2% of our electrical useage). Am I supposed to throw away my beautiful old light fixtures for that? Man made global warming is only an unproven theory after all. I'm thinking I should stuff my attic with the incandescents while I still can. |
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(NR) |
Very interesting that Japan and China mass produce the LED 120V with E27 base for $3.05. Any body smart on how much air/UPS&freight postage from China for under 7lbs? Some LED bulbs in America cost 50.00$. NO WAY shipping is THAT much!! The LED is useful b/c the filamant does not get hot and the bulb pulls less coal energy...thats what we pay for to generate electricity, |
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dan (NR) |
One of the biggest advantages of LED bulbs over CFLs, is that they don't have mercury inside of them. Also, what's often forgotten is that mercury is produced when electricity is generated (at least in coal fired power plants, which supply 49% of the US's electricity). This website ( here ) has a good explanation. Also, they have a comparison of CO2 production on their main page. |
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hotelguy (NR) |
Incandescents are still the best overall because of those darned physics rules that people forget about: the supposed "wasted electricity" is not wasted at all; the reason they use more electricity is because of the heat they produce; majority of the country uses heat the majority of the year; therefore when we caclulate the extra heat required for homes and businesses to make up for less heat produced by the lights, all the arguments against incandescents go away. Oops. |
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Cedric J. McKeever (NR) |
Do incandescent bulbs actually generate enough heat to slightly warm room? |
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(NR) |
LEDs are very good for emergency lighting. No source of lighting should be completely phased out, but the gov't should give small tax credits for using efficient lighting...???...... |
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(NR) |
Approximately 90% of the power consumed by an incandescent light bulb is emitted as heat, rather than as visible light. So as an example a 100 watt bulb would generate 90 watts of heat. And that's quite a bit of heat. A full blow resistance heater set on high converts 1500 watts of electrical power into heat. So yes, the buld doesn't make as much heat as the heater, however it is just as efficient at producing heat as the heater. |
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(NR) |
It is classical comparison from all the angles. Technical and Feasibility comparison is special. The Excel Sheet given for the users is an added advantage for common man/ lay man. Great work on this issue, from a Technical Expert for the common citizens around the world. +Dr. Ashish Manohar Urkude |
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Erik (NR) |
I am a musician and use new LED lighting for stage. They are bright, dimmable, low power and wash the whole stage with light without heat. The technology is already here. I want to find some for my home that screw into standard sockets. |
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+Gordon Howell (NR) |
The lightbulb comparison spreadsheet does not compare the economics of the lighting options properly. Firstly the lighting output in lumens should be quantified. LEDs are less efficient than CFLs at this point -- CFLs are around 70 lumens/W and LEDs are around 40... LEDs are heading in the direction of being over 100 lm/W but they are not there yet... When they do then there will be a huge lighting revolution. So comparing a LED that puts out 150 lm with a CFL that puts out 1100 is not correct. In addition, ***all*** electricity used within a home ends up supplying heat to the home. So if you reduce the electricity consumption by using energy efficient light bulbs (which is good) then your home heating bill (gas or electricity) goes up, and the economics of the energy efficient light bulb decreases (though is still very doo). The economics then also depends on what the energy price difference is between natural gas and electricity. If you also live in a climate with summer cooling then your cooling load can go down, which improves the economics. These are very important factors to consider. |
stevenmontain (2) |
Well I haven't really done my homework and have only lightly skimmed the comments but I need to go on the record for saying, I believe there have been drastic improvements in LED lighting. Whether these improvements are available in products currently, I don't know. I only recall reading of this several months ago in which it was reported a significantly cheaper and less harsh(color) LED had been developed. Does a micro-dimpled surface sound familiar? ...I don't know. |
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Derek (NR) |
People need to stop buying CFL's. They suck and there Toxic. First off I replaced every bulb with CFL's not doing any research. It turns out I'm not the only person that has had CFL's fry. I had more then six of them burn in less then six months. I witnessed twice in the shower when they start flickering and then they shut off. Three seconds later they pop and a small flame comes out and hisses for about 5 seconds! Second, They contain mercury!!! These things are anything but green. I would recommend LED lites or if you can't afford them just go old school tell they drop in price. |
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(NR) |
I have to agree CFL bulbs are the only way to go. I have used them in my house since 1998 and I have only had 2 go out. 1 after 9 years and one a week after I got it but it was a cold cathode CFL which is new technology. I know I saved about $8 dollars a month not a whole lot but times that by 80 months and i've saved $640 |
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(NR) |
I have to agree CFL bulbs are the only way to go. I have used them in my house since 1998 and I have only had 2 go out. 1 after 9 years and one a week after I got it but it was a cold cathode CFL which is new technology. I know I saved about $8 dollars a month not a whole lot but times that by 80 months and i've saved $640 |
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(NR) |
While I am new to the concept of LED lighting it does seem like a very encouraging green technology. For those that were looking for residential LED lighting I just saw an article in the LA Times about a company called CREE which is launching LED downlight retroifts. They are quite expensive at the moment, (about $130 each), but I am sure the price will come down over time. I am really excited because I have tried CFL's in my downlights and the lighting quality was not very good. The brightness of CFL's also seem to dull over time. |
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Melinda (NR) |
CFLs can trigger migraines and seizures in people who are susceptible to them. I can't stand fluorescent light of any kind. I hate that so many businesses are switching to CFLs. LED lights on the other hand don't cause any reaction at all. I'll be going with the LEDs, thank you. |
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(NR) |
Indeed LEDs are coming and innovative developments for LED Lights were made to limit all the drawbacks in using LED lightings. I am glad to see positive and logical comments as well as comparisons of different bulb available in the market. As inventor and manufacturer, we know that LED will be the future of ligthing business. It is here now and by knowing our VIO LED products, we are certain that all hesitation and drawback associated with LED will be addressed by our company. In line with this we are looking for partners globally to market and distribute our products before big companies in this industry will buy the rights to market our products. I hope through this comment we can get partners globally who are willing to invest to our VIO LED. Best regards, Joel Milag President and CEO JC VIO White High-Power LED Lighting Singapore |
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CC (NR) |
Great points made in here. Bottom line, you gotta start somewhere. I've switched 90% of my bulbs to CFLs. Power bill when down, and I'm saving $$ overall, even when you factor in the cost of the bulb. I've had some of my CFLs for 2 years, and no failures to date. Would love to go LED, but their refractive abilities are just not there - YET..but one day they will be... Hey, it took us 130 years to phase out the incandescent...one step at a time. |
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(NR) |
Dear Sir, How are you? I am Katrina from Sping LED Lighting. I am writing to you in the hope of establishing good relationship with you. We are specialized in LED fixtures. We have 6 years experience in the field of manufacturing LED illumination products— T5. T8 LED fluorescent light, Xpower LED lamps, LED flex strip, LED rigid strip etc. For more product information, please visit our website: http://www.sping-ledlighting.com If you are interset in any of them, please feel free to let me know. Best Regards, Katrina Sping LED Lighting Sping LED Lighting ---- Professional LED Lighting manufacturer E-mail: sales@sping-ledlighting.com Tel: 86-21-52730984 Fax: 86-21-52730984 Website: www.sping-ledlighting.com Msn: spingled@hotmail.com Skype: spingled |
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(NR) |
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BDM (NR) |
I would first like to say, that after some time of personal use of CFL they are not worth all the hype. They perform very poorly in cold climates; they may be a little slow to light in below zero temperatures when they are new, but as they age the longer that time becomes (4-5 minutes); to me that is quite an inconvenience. As far being promoted as a “green,” I noticed that it is very rarely brought up about their hazardous content. They also have a high failure rate. The last two I have bought did not work right out of the box. I do believe that LED will eventually take over the lighting market; however, they are still in their infant stage. The cost is still too high for the mainstream public and the technology needs to be improved. I would be very curios to see a comparison studied done using these same bulbs, but use a Lux meter to measure the foot-candles at fixed distances from the bulbs. |
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BDM (NR) |
I would first like to say, that after some time of personal use of CFL they are not worth all the hype. They perform very poorly in cold climates; they may be a little slow to light in below zero temperatures when they are new, but as they age the longer that time becomes (4-5 minutes); to me that is quite an inconvenience. As far being promoted as a “green,” I noticed that it is very rarely brought up about their hazardous content. They also have a high failure rate. The last two I have bought did not work right out of the box. I do believe that LED will eventually take over the lighting market; however, they are still in their infant stage. The cost is still too high for the mainstream public and the technology needs to be improved. I would be very curios to see a comparison studied done using these same bulbs, but use a Lux meter to measure the foot-candles at fixed distances from the bulbs. |
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(NR) |
it’s becoming increasingly important that background checks are used more and more these days. This applies whether the issue at hand is a new employee, you’re starting a new business, checking a new tenant to live in your property and even personal relationships |
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(NR) |
we know that LED will be the future of ligthing business. It is here now and by knowing our VIO LED products, we are certain that all hesitation and drawback associated with LED will be addressed by our company. In line with this we are looking for partners globally to market and distribute our products before big companies in this industry will buy the rights to market our products |
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Nick B (NR) |
Yes, heating bills will increase somewhat without incandescent, but A/C and fan bills will similarly decrease. The arguments don't go away. Even in areas with long winters often have warm weather in the summer, so you are wasting that energy on producing unneeded heat. Let's keep each device to its own purpose: heaters should provide heat only and lights should provide light only. |
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(NR) |
Civilight shenzhen Semiconductor Lighting Co.,Ltd is a high-tech company which is mainly engaged in scientific research,production,technical support and service of LED semicondutor illumination.We run our factory under ISO9001:2000 and ROHS mark system. Covering an approximate area fo 10000 squre meteres,among which 3000 square meters is for R&D and office and 7000 square meters is for workshop, Civilight is eqquipped with numerous of advaned experementation equipment and full automatic production pipeline, and has an anual production capacity of 7,200,000pcs for LED lights. Main products:Power LED Spotlight GU10/MR16/JDR/ALUNI MR11,Power LED Bulb G45/G50/G60/A60/Candle,Top LED Tube light,Power PAR30/PAR38, Common PAR20/PAR30/PAR38,Cabinet light,Ceiling light,Power R111,Traffic light series,Common LED spotlight, Project light, Other LED product |
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(NR) |
Civilight shenzhen Semiconductor Lighting Co.,Ltd is a high-tech company which is mainly engaged in scientific research,production,technical support and service of LED semicondutor illumination.We run our factory under ISO9001:2000 and ROHS mark system. Covering an approximate area fo 10000 squre meteres,among which 3000 square meters is for R&D and office and 7000 square meters is for workshop, Civilight is eqquipped with numerous of advaned experementation equipment and full automatic production pipeline, and has an anual production capacity of 7,200,000pcs for LED lights. Main products:Power LED Spotlight GU10/MR16/JDR/ALUNI MR11,Power LED Bulb G45/G50/G60/A60/Candle,Top LED Tube light,Power PAR30/PAR38, Common PAR20/PAR30/PAR38,Cabinet light,Ceiling light,Power R111,Traffic light series,Common LED spotlight, Project light, Other LED product |
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(NR) |
We are one of the manufacturer of led lamps in China, main produce led tube, high power led(1w,3w,10w,20W,30W),led module, led flashlight . and full experience of 7 years .our products are sold well to over 18 countries , pls browse our web: here '>here Will you please tell us which types led lamps you are interested in or particular require? contrapose the types we can offer the price or arrange samples to test. pls directly send mail ( successled@yahoo.com.cn ) contact with us. Best Regards Richie Huang Jiangsu Bright Optoelectronic Technology Co,.LTD. Tel : +86 515 88263888, Fax : +86 515 88182888 Email: successled@yahoo.com.cn Msn: successled@hotmail.com Website: here '>here |
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Peter (NR) |
Waiting for LED's to get there; I'll use incandescents until then. I will never use another CFL. They're made in China, are of unreliable quality and contain mercury. To the poster who said he had mercury in his teeth, BS. I had that conversation a few months back with my dentist regarding filling replacements. The mercury in amalgams is bound and solidified, so if it is inert. Not so for the mercury in CFL's. I find it hard to believe the EPA even allows CFL's to be used in this country. |
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Larry Robinson (NR) |
I see a few misconceptions in these posts: - Metallic mercury is not nearly as dangerous as oxides and salts of mercury. It is dangerous, but not as dangerous as some nuts claim. People using the NFPA (National Fire Protection Agency) lists see only one entry for "all mercury compounds". These lists are for firefighters, and they don't need to know the difference when fighting a fire or cleaning up a spill. And the silver mercury alloy is not dangerous unless something happens to separate it. Usually heat or a strong acid is necessary here. - Everyone is afraid of mercury in fluorescents, but nobody seems to notice the arsenic in LEDs. - The life of flourescents and CFLs is determined by the number of times the lamp is turned on, not how long the lamp is left burning. A fluorescent lamp is good for about 6500 starts. Cold temperatures reduce this number. - There are mercury-free fluorescents. But the light is an emission-line spectrum, so color rendering suffers. - The only continuous-spectrum source is the incandescent light. They could make continuous-spectrum LEDs, but for some unknown reason, they don't. Continuous-spectrum fluorescents require high mercury pressures and poisonous phosphors, and they contain bright lines on top of the continuous part. - Most CFLs have 8 emission lines, instead of a continuous spectrum. White LEDs have a nearly continuous spectrum, but are missing the deepest reds, cyan, and violet. - I would think that LED lamps would drive you crazy if CFLs bother you. CFLs flicker at 120 Hz (as do all fluorescents). The LED lamps I have flash at 60Hz, because they are not lit at all for one polarity of the alternating current cycle. I have never seen an LED for home use that required a power supply. Those wedge-base ones are for the 12V outdoor yard lights. - To use LED lamps with a dimmer, at least one incandescent lamp must remain in the circuit. - Those LED car turn signals don't save any power, because the resistor that must be installed to make the flasher work uses as much current as the bulbs that were removed. - I can't stand the yellow color of the Soft White CFLs. They are worse than incandescent lamps. I need good color rendering. - I want to see an LED bulb with a color temperature adjustment. |
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(NR) |
We had a CFL go bad after a short time in a room where it was little used (from Phillips, so a major brand). This was disappointing, but the aftermath was worse, since the bulb broke during changing. We read the Maine state Department of Environmental Protection report on CFL breakage and mercury contamination: very thorough, 200+ pages all told, responsibly scientific, with duscussions of methodology and tabular data, etc. The report is at: http://maine.gov/dep/rwm/homeowner/cflreport.htm But check out especially the one-page appendix E, "Revised Cleanup Guidance" for important advice about dealing with breakage: among other things, they tink it's worth considering not to use these things in rooms with carpets or kids, due to the difficulties in cleaning well (and the dangers of this particuar form of mercury). In fact, they say you might want to have the carpet *replaced* after such an incident, depending on details. For us, the combination of much-less-longer-than-promised bulb life and the expense and worry of clean-up made it a little harder to jump on the very-expensive-startup CFL bandwagon. (Your mileage may, of course, vary.) |
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Warren Kehr (NR) |
Flourescent lights existed a long time before the CFL's were created (about 50 years). And the first CFL's were quite expensive. LED's are a much younger technology so the rate of change is much greater. White led's and powerful one to five watt led's are relatively recent. The circuitry for LED lamps might eventually be less expensive than the circuitry for CLF's. To eliminate flicker for an led the power would need to be recitied and smothed while a CFL would use an r/c circuit to create a higher frequency. Do CFL's still need a balast? Light dimmers are created specific to the techmology that is being dimmed. Incandescent bulbs generate light when the filament is heated and the electricity can be either AC or DC. Pretty much any method of delivering less electricy generates less heat and therefore less light. Led's on the other hand are DC devices that do not use heating to produce light. The way to dimm led's is to switch the DC current on and off quickly. The ratio of ON to OFF time determines the intensity. Led lamps can be constructed with circuitry to run with a common dimmer. |
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(NR) |
Just think: the right housing can optically redirect LED light nearly all around, so the initial directivity isn't insurmountable as a disadvantage. |
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(NR) |
Just think: the right housing can optically redirect LED light nearly all around, so the initial directivity isn't insurmountable as a disadvantage. |
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(NR) |
This can be like, As far being promoted as a “green,” I noticed that it is very rarely brought up about their hazardous content. They also have a high failure rate. The last two I have bought did not work right out of the box. I do believe that LED will eventually take over the lighting market; however, they are still in their infant stage |
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(NR) |
make this time, LED 120V with E27 base for $3.05. Any body smart on how much air/UPS&freight postage from China for under 7lbs? Some LED bulbs in America cost 50.00$. NO WAY shipping is THAT much |
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Common Sense (NR) |
NO TO MERCURY! NO TO MERCURY! NO TO MERCURY! What part of NO MERCURY do you not understand?! It's in the lakes, the ocean, the fish you eat and is toxic as a grain of salt in a pool. Nothing about CFL's are green. |
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Scott Aliferis (NR) |
The UK has banned the CFL's ... Dangers to the environment USA will wait until our children are buried before they do anything. Greenlitesaver.com offers a solution for the Ben Franklin Invention! Help save the planet and energy at the same time |
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Jason (NR) |
The GEOBulb at C. Crane looks promising, but very expensive at $120 each. here |
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(NR) |
High power LED bulbs compare with multiple white LED bulbs, The cost of high power LED will higher than multiple white LED, The efficiency of multiple white LED bulb will better than high power LED bulb. If you just like the light output and price, Please choose our multiple white led bulbs. But please note that the Life and Lumen Maintenance of high power led bulbs are better than multiple white led bulbs. Buy Household LED light bulbs from www.ledlightbulb.net/store/ |
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(NR) |
How to calculate the lumens? If it output 15~20 degree beam and cool white, For multiple white LEDs, It is about 2~2.5 lumens each piece LED (note that the lumens will be less for wide beam angle LED light bulbs). For high power LED, It is about 40~60 lumens each watt. Please note that the lumens for warm white will be less than cool white. For example, It is about 1.5 lumens each piece LED. |
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(NR) |
How to calculate the lumens? If it output 15~20 degree beam and cool white, For multiple white LEDs, It is about 2~2.5 lumens each piece LED (note that the lumens will be less for wide beam angle LED light bulbs). For high power LED, It is about 40~60 lumens each watt. Please note that the lumens for warm white will be less than cool white. For example, It is about 1.5 lumens each piece LED. |
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(NR) |
The Evolux '>here 13 Watt LED Bulb is rated at 900 lumens.. thats 69 lumens per watt in the case of this bulb.. it is a newer LED technology called CREE LED. They have a nice selection of led '>here light bulbs at this place Earthtech Products.. |
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(NR) |
The Evolux '>here 13 Watt LED Bulb is rated at 900 lumens.. thats 69 lumens per watt in the case of this bulb.. it is a newer LED technology called CREE LED. They have a nice selection of led '>here light bulbs at this place Earthtech Products.. |
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(NR) |
Looks like my helpful links in my comment above didnt work.. I guess I will do it the old fashioned way instead of trying to get fancy with HTML.. Evolux 13 watt bulb @ 900 lumens: http://www.earthtechproducts.com/led-bulb.html the rest of their led light bulbs: here |
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Tim (NR) |
You can make all the claims about how energy efficient CFL or LED bulbs are you want, if you are not comparing the same output you are not making a fair comparison. If everyone turnes off the lights and lived in the dark, we could save more money and close more power plants than all your suggestions combined. Oh, and about heat lost by incandescents. Most incandescent bulbs are inside your home. The heat lost by the bulb heats your home. If the bulbs don't put out heat anymore, your furnace will have to turn on more often to make up for the heat. Ultimately one way or another you have to replace the heat in your house lost through the walls, ceiling, and windows. Heat is added to the house through the furnace, hot water pipes, cooking appliances, light bulbs, people, etc. So, when you pay for the 60 watts of electricity for your incandescent bulb, you are paying partly for light and the "lost" heat reduces your heating bill, so it's really not lost. CFL's pose a major risk to my family. If one is broken, it can raise the toxic levels of mercury in my home 10 times the safe level. I've used the calculator. If I replace the "not easily broken" bulbs in my home with CFLs, I would save maybe $10-$20 per year. Not worth it for the risk. sorry. |
Planetled (1) |
Hello from Canada Yes LED is far better than flouresent or CFL by far especially when you consider that here in BC the rate of electricity will double April 2009 and ALOSO NO MERCURY. Walmart sold 145 Million CFL's is 15 months .Good for them .BUT Not good for our kids futures on this earth. Please seehereorhereand we will convince you price wise and environement wise on LED! We have a newly certified for use LED flouresent replacement tube that is about 30$ and is quality driven according to our standars here in North America. Just a few to mention the Country's of Mexico, USA Canada have decided to save the planet 1 flouresent tube at a time ! Also Columbia, Argentian should I go on??? or just say poo poo to all CFL users |
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(NR) |
Dear Sir We are an industrial group with different production . You can see our production in our web site : www.sgpco.com Now we are going to produce led lights (bulbs or other shapes). For this purpose we need following : 1 – leds 2 – machinery to assemble led lights Can you supply some of these ? We are waiting for your reply . Best Regards SGP co. |
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Jan Maxson (NR) |
There is no doubt that LED lighting has it advantages. How does a residential home inexpensively switch over to LED with its existing 5" IC housing and maintain a 2800k to 3000k color rendering? Without removing all and starting over to keep the conversion costs to a minimum? I think this is where many will be concerned. We used CFL lighting and the light was blue which changed the colors in our interior and exterior and conflicted with our incadescent lamps. Best Regards JMM |
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Angela (NR) |
I just bought 3 LED bulbs at Sam's club today for $14.99. They had several styles, like flame tip and flood light. I'd say that's a decent price. However, I immediately noticed that they are not as bright as my CFL's--hope they continue to improve. |
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John Sawyer (NR) |
As others here have pointed out, one problem with CFL bulbs is their current quality control. I've been using CFL bulbs in regular light sockets since the late 1980's (prior to the twist tube type), and I've found that the CFL bulbs made for the first few years, lived up to their stated lifetime of several years. But as other people have seen, I've found that many CFL bulbs made for the past couple years, fail within a few months to a year. I've seen this with CFL bulbs made by a variety of manufacturers. I'm sure the reason is they've been deliberately designed and/or manufactured to fail sooner, so their manufacturers can sell more. I wouldn't be surprised to see this trend continue to the point where the cost savings with CFLs becomes much less, if any, versus incandescents. They don't care--all they see their role as being, is to sell as many light bulbs as possible--they don't care if the consumer pays as much, eventually, for the combination of CFL light bulb costs plus energy costs, as they did when buying incandescents. As far as home heating lost when switching to non-incandescent bulbs: LEDS and CFLs are still superior, since you get heat from incandescents even when you don't want it, like during the summer. With LEDs and CFLs, during cold weather, you can up your home's heater setting to compensate, so it's under your control--with incandescents, you may need to up your air conditioner's (if you have one) setting to compensate for the heat they generate during the summer. So the energy savings from LEDs and CFLs, when taking heating into account, is still better than with incandescents, since with incandescents you might run a heater more, and with non-incandescents, you might run a cooling device more--if the energy required by the heating and cooling devices is about equal (let's assume for the sake of argument that they are, as unsatisfactory as that assumption may be), the non-incandescents are still consuming less energy than the incandescents, so that probably delivers a net reduction in power use. |
John Sawyer (2) |
As others here have pointed out, one problem with CFL bulbs is their current quality control. I've been using CFL bulbs in regular light sockets since the late 1980's (prior to the twist tube type), and I've found that the CFL bulbs made for the first few years, lived up to their stated lifetime of several years. But as other people have seen, I've found that many CFL bulbs made for the past couple years, fail within a few months to a year. I've seen this with CFL bulbs made by a variety of manufacturers. I'm sure the reason is they've been deliberately designed and/or manufactured to fail sooner, so their manufacturers can sell more. I wouldn't be surprised to see this trend continue to the point where the cost savings with CFLs becomes much less, if any, versus incandescents. They don't care--all they see their role as being, is to sell as many light bulbs as possible--they don't care if the consumer pays as much, eventually, for the combination of CFL light bulb costs plus energy costs, as they did when buying incandescents. As far as home heating lost when switching to non-incandescent bulbs: LEDS and CFLs are still superior, since you get heat from incandescents even when you don't want it, like during the summer. With LEDs and CFLs, during cold weather, you can up your home's heater setting to compensate, so it's under your control--with incandescents, you may need to up your air conditioner's (if you have one) setting to compensate for the heat they generate during the summer. So the energy savings from LEDs and CFLs, when taking heating into account, is still better than with incandescents, since with incandescents you might run a heater more, and with non-incandescents, you might run a cooling device more--if the energy required by the heating and cooling devices is about equal (let's assume for the sake of argument that they are, as unsatisfactory as that assumption may be), the non-incandescents are still consuming less energy than the incandescents, so that probably delivers a net reduction in power use. |
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John Sawyer (2) |
Add plasma light bulbs to the mix: here |
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(NR) |
We are professional LED lamp manufacturer in China, and our main products are Li-ion battery, miner's caplamp, spotlamp, LED Bulbs, LED Strips, LED Spotlight and etc. Our product features: Free maintain, long time usage, light weight, waterproof. For more information or any requirement, please feel free to contact us. Best Regards Mr. Jeff Win Create Holdings Co., Ltd. Tel: 86-755-61220808 Fax: 86-755-61220801 Email: jeff@happywong.com Msn: ledfactory@hotmail.com here |
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Jim (NR) |
The whole issue with the Forcing of the CFL Technology on us is anti American at the least! first off not one CFL bulb is made in the U.S.A.! They are all made in CHINA! So there goes more of our Jobs over seas! Now to the rest of the Story! CFL bulbs are very dangerous to use! When you are installing them DONOT touch the Glass tubing as it will Crush in your hands very easily! And inside of that Glass tubing is a white Dust! And that White dust is Very Toxic! It does contain Mercury and A host of other Toxic chemicals! And the Transformer on the Bottom of the Bulb Also contains a Highly Toxic PCB Compond! If you read the detailed warnings on the package they come in and follow the Instructions if you Break one of these things in your home! It will cost you about $2000.00 minimum to get it cleaned up! NOW on the other hand A regular Incandescent Bulb Designed by Thomas Edison and the Majority of them have always been made in the U.S.A. contains steel and Tungsten! Neither one of which is the least bit Toxic! And oh yes it contains a vacuum! Which is the abscence of alll gas or Air! So if you break one the only thing you have to do is sweep it up and put it in the trash! PERIOD! Now on to the Savings! First the CFL will cost you about 5 times as much as the Incandescent bulb Yes it uses less ampeage but you have to buy a 100 Watt equivlant CFL to equall the light output of a 60 Watt Incandescent! And the will not work correctly with a Dimmer Switch! Unless you buy the Special ones that will cost you 2 times more again! And they DONOT like temps below 32 degrees at All So forget about putting them where it gets Cold! A lot of people in Cold Climates use Incadescent bulbs to supply a small amount of Heat to keep pipes from freezing etc. Well CFL'S will not work for that Either!! I for one will stick to Thomas Edisons Invention the Incadescent for as long as I can buy them and if they quit making them Well I might just have to Start a company to Start making them Again! I don't have any CFL'S and will not buy Any in the future! PERIOD!!! The so called savings that they claim you are getting is not Worth the risk you are taking with the Toxicity of the CFL'S Plus the outsourcing of more of our Jobs Which i believe is suppose to be the Major Number one Priority in this Country at the present time! So anyway As far as CFL'S are concerned BAH HUMBUG! |
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Jim (NR) |
If you would like to Watch an interesting Video on the Subject Please Copy and Paste the following into your Address bar! Very Interesting! Please Watch!!!! here |
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(NR) |
My firm is the exclusive distributor of LED replacement bulbs for the US Market. You don't have to worry about the following issues with LED's anymore: 1. Color temperature - we have cool white, warm white and for large commercial applications we can dial in virtually any color temperature desired. 2. Light Output - Third party independent testing has shown that our replacement products meet or exceed florescent and provide extremely efficient, long lasting light. 3. Special fixtures- All of our products are plug-n-play. Take them out of the box and replace your existing bulbs with LED. Our company's manufacturing facility currently supplies over 80 percent of the LED replacement bulbs sold in europe. All are ETL/UL listed, 100 percent environmentally Safe. (Rohs) It is important to understand the dynamics of light. LED's are extremely efficient due to the ability to selectively produce specific light color temperatures. Therfore, light that is unuseable to the human eye is not produced thus saving energy. LED light is unique and current light meters can not accurately rate the pure light produced. Testing and rating systems for these lights are being created now. Don't be fooled by early versions on the market today, the light output of the standard cheap LED's are poor at best. We have spent 8 years developing a line of products that is over 100 products strong and is specially made for the US lighting demands. Please contact me directly for more information athere We currently are not selling to retailers in the US but have several that will be ready this year. Best of Luck and Beware. |
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justme (NR) |
the link for the spreadsheet does not work |
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Fred Merriam (NR) |
To Ken (01/27/09): Your link doesn't work. |
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kirk anderson (NR) |
Okay, so what's the point? I have incandescent bulbs and am doing fine! They don't harm me and are disposable and cheap. And I don't really mind replacing them. So, I should replace them to save energy? For what? So someone else can use that energy? To save the power companies from having to make investments? To get someone elected? To save the planet? (Really) I am starting to think this is so some countries (China) and companies (GE) has gotten the honest politicians in Washington D.C. to mandate (order their subjects) this so they can make some real "green". Maybe we should take a step back and think outside the box. Try it. |
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rosie (NR) |
LEDs, or light emitting diodes, which are a whole lot "greener" than CFLs. The newest LEDs use even less energy than CFLs. They last for as long as a decade. And, unlike CFLs, they are mercury-free. CFLs work by using electricity to excite mercury vapor in gases, which produce ultraviolet light; fluorescent technology has been deployed commercially since the 1930s. Today's CFLs use about one-third as much power as incandescents, to produce the same amount of light. ncandescent bulbs work by heating an electrified wire filament in a vacuum tube. They are wasteful: 95 percent of the power used by incandescents is given off as heat. This is why an Easy-Bake Oven can make a cookie using a light bulb. |
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(NR) |
Here is the answer to the Incandescent, Flourescent, LED question. Borealis Lighting holds the only patent on diffusing the light emitted from an LED. The final piece to the LED puzzle. They will lead the charge when the bulb manufacturers allow the conversion from environmentally unfriendly Flourescent to LED. But, they must deplete their current inventories before they will allow the new bulbs on the market. |
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Jeremy (NR) |
check out the link for more information. The game has finally changed. |
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Shawen Donnellan (NR) |
We had a number of CFL bulbs in the house and other than the still wild variations in quality we were generally pleased. However, when our daughter was born we decided to pull them out until she was older. The mercury risk is unacceptable with a baby crawling around on the floor. Hopefully the two years or so we will be without CFLs will allow the LED lamps to come along far enough to let us just switch to them instead. |
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(NR) |
LED lamps clearly better then cfl and CFL lamps life is limited to the stocs of philips and osram. 1 trick they use to promote CFL lamps is low power consumption but how ever power on box only represents power of lamp not including ballast and measured from AC line input. Their life time is 10.000 hours but if you use only few hours a day.hereand see what can be done with power LEDs |
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Filipek (NR) |
"We had a number of CFL bulbs in the house and other than the still wild variations in quality we were generally pleased. However, when our daughter was born we decided to pull them out until she was older. The mercury risk is unacceptable with a baby crawling around on the floor. Hopefully the two years or so we will be without CFLs will allow the LED lamps to come along far enough to let us just switch to them instead." That's the most ridiculous, paranoid over parenting thing I've ever heard. CFL bulbs are only a risk if they break - how often do your incandescent bulbs slip out of their Edison socket and shatter on the floor? Disposal and mercury are issues, but certainly not the issue that you're making unless you have them protruding from the floor. |
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NAspar (2) |
I have a few LED, some CFL and some Incandescent bulbs. I'm not up for debate about the cost savings, my concern is the misleading Excel sheet. There's a calculation that has the number of bulbs in the house and estimated daily usage as well as, the number of days per month using these x-number of bulbs. I personally do not go home and turn on all my lights for y-number of hours. I will go home, go to the kitchen, turn on lights, leave the kitchen switching off the lights, go to the dining room turn on then leave switch off, living room rinse and repeat. My point is the Excel sheet needs to be more specific on what rooms are used per hour then multiplied by the number of lights in that room and multiplied again by the number of days per month used that will give you a better estimate on cost savings. Can someone say statements? thank you |
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NAspar (2) |
My last line should say, can someone say if then statements? |
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(NR) |
We export high power LED bulbs & LED down lights. Pls view our web www.eltlite.com My email is sales1(at)eltlite.com : ) Your Redy. |
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jackson (2) |
I was at a green lighting expo last week, and it was good to see the price of LEDs have signficantly dropped, and rebates are now being offered in certain states for LED-specific retrofits.hereis a new company that was at the expo that pulls from alot of different manufacturers and can get a great price foir LEDs |
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jackson (2) |
Sorry, the link doesn't seem to be working....the company is Kuuala website is Kuuala.com |
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antiquo (1) |
I got a problem using LED pilot lights on my control circuit. Was installed in series with the Contactor's contact with one leg soldered to Line2. Supply voltage is 220VAC. Even contact is open, pilot light lit / glow. nearly bright as if contact is close. Any suggestion for a good circuit? |
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(NR) |
Good job guys! I've heard and seen more and more people who care about the environment. Check out this website if you are looking for supplier for green technology products. www.greentechsourcing.com |
Posted: December 18 2006