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Old 10-09-2012, 12:29 PM   #17
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Join Date: May 2011
Device: kindle3, paperwhite
Quote:
Originally Posted by murraypaul View Post
Sigh.
This is of course not true.
Powering a light takes energy. That energy comes from the batteries.
Of course. I desperately hope that nobody here believes that the LEDs can operate without a power source.

What is in dispute is how much power they need. I haven't received my PW yet, and I wouldn't take it apart just to measure the current, but I'd guess that the current draw per LED is on the order of 1mW¹. Given that there are eight LEDs and the battery is on the order of 6Wh¹, that would translate to about 750 hours of light-on, if everything else is powered off. Clearly that's not the case, but it appears that Amazon's claim that the lights consume significantly less than the rest is not patently absurd.


¹Figures obtained through the time-honoured method of 'Pulling them out of the arse'™. Any real figures greatly appreciated.
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