Provided you`re willing & able to lift a 50 pound (22.6796185 kilograms) weight a height of 4 feet (1.2192 meters) every 4 hours (4 hours), you too can have about 40 watts of light for up to 200 years.
Clay Moulton a student at Virginia Tech won 2nd prize at the recent Greener Gadgets competition for his proposed design of the Gravia floorlamp described above and illustrated at right.
Lamp lit by gravity wins Greener Gadget award – Virginia Tech News, Feb 19 2008 via Core77
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