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How much electricity will an ultra efficient light bulb use?
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Topic: How much electricity will an ultra efficient light bulb use? (Read 358 times)
epichero22
Newbie
Posts: 1
How much electricity will an ultra efficient light bulb use?
«
on:
May 28, 2011, 01:40:34 AM »
Certain incandescent bulbs give out 550 lumens and are rated at 40 watts. 13.75 lumens / watt.
CFL equivalents are rated at 9 watts. 61.11 lumens / watt.
The LEDs I have in my hallways give out 400 lumens and are rated at 5 watts. 80 lumens / watt.
So my question is, assume that a technology is able to convert 99.9999% of the electricity in a bulb to light and otherwise avoid wasting electricity to heat, how much light output will you get per watt?
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Ray_mond
Newbie
Posts: 8
Re: How much electricity will an ultra efficient light bulb use?
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Reply #1 on:
May 28, 2011, 03:44:25 AM »
One lumen = 0.00147 watts. 680 lumens = one watt at 5550 angstrom units = yellow light, maybe orange according to my handbook. That indicates that your LED is 12 percent efficient and the CFL 9%. Long life 40 watt incandescents give less than 550 lumens, so less than 2%.
Apparently there are other definitions of lumen as efficiencies are usually given as about 8.5 times that much. assuming 8.5 times, 99.9999 % efficiency is 8.5 times 80 = 680 lumens per watt. Perhaps someone can clarify? Neil
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