Quote:
Originally Posted by N3LYT
Wow then they are pretty generous with their light output specs.
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Not necessarily. The five-meter piece consumes about 24 watts. According to the listing, it produces about 200 lumens per meter, or 1000 lumens for five meters. Since one watt equals 683 lumens (at the wavelength of the eye's peak sensitivity), the 24 watts consumed is the same as 16,368 lumens. If we actually get 1000 lumens as light, and the rest as heat, then the efficiency is 1000/16368 or just over 6%. Incandescent lamps typically run about 2% to 2.5%, with small ones usually at the low end; so the LEDs are about three times as efficient as incandescent lamps. I would have expected more, actually. They've probably got series resistors in these strips, one for each set of three LEDs in series.
Fluorescent lamps generally run about 10%, so I can easily believe these LED strips are 6% efficient.