![](http://www.sciencedaily.com/images/2008/02/080220221822.jpg)
This is really neat!
It's a
gravity driven light.
So you basically flip it over like an egg-timer, and the weighted LEDs sink to the bottom, driving a propeller which energizes the LEDs.
The equivalent of a 40watt bulb for about 4 hours!
... that's pretty green!
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