Gravity powered Lamp

By Anonymous -

 Gravity powered Lamp




This is a lamp that is powered by a bag of sand or rocks, hung by a cord, which gradually comes down just like the weight drive in a cuckoo clock.

The concept of GravityLight was developed by Clay Moulton and Mike Wofsey in 2006, though early prototypes were found to be inefficient. They found that 10 kilograms of mass raised to a height of one meter gives a maximum energy of 98 joules, which at 100% conversion efficiency for five minutes, and would produce 0.32 watts and 0.16 watts at 50%. The resulting LED light was not enough for reading or working, so, they traded illumination brightness for illumination time.




Following two fundraising campaigns, Martin Riddiford and Jim Reeves developed the light further. The slowly falling weight spins gears driving the electric generator and powering the LED for 25 minutes. After that, the weight can be lifted up again with the cords to power the light for the next 25 minutes. When mass produced, these lights can serve as a zero-operational-cost alternative to normal electric lamps or kerosene lamps in poor countries. (source)

By,
Yenuja Daluwatta

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