[Novalug] This is waaaaaaYYYYY COOOOLLLL
edjames at greenbelt.com
Thu Feb 21 19:23:29 EST 2008
Tried the same calculations. 50 pounds at a height of 4 feet has
200 ft-pounds of potential energy. 1 joule = 0.73756 ft-lb, so
we're talking 271 joules of energy.
1 Watt of power is one J/sec. There are 14400 seconds in 4 hours,
so 271 J released over that time means about 0.02 Watts. Those
must be darn efficient LED's in that gadget.
I realize that the 40 watt number refers to power needed for comparable
light from an incandescent bulb, but still...
Quoting Ed James <edjames at greenbelt.com>:
> "Proposed design", "concept illustration", "patent pending". sigh.
> Ed James
> Quoting Clif Flynt <clif at cflynt.com>:
>> A friend of mine did some back-of-envelope calculations and comes
>> up with not enough energy in a 50 lb weight over that distnace to
>> power the LED for the described time.
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