A $5 Light For The Developing World With An Ingenious Fuel: Gravity

The GravityLight gets power from the slow lowering of a weight. All it takes is enough elbow grease to hoist the bag, and you can light a room with nothing but a bag of sand.

Jan18-2013Buildingaschool

Many of the solutions out there are ingeniously solar powered. But GravityLight, an idea from two British designers, is something completely different. It gets its energy from gravity: A 22-pound bag of sand that gradually cranks a gear-train attached to a D.C. motor. One lift is enough for 30 minutes of light, and recharging is as simple as pushing the weight up again.

Read more: http://www.fastcoexist.com/1681067/a-5-light-for-the-developing-world-with-an-ingenious-fuel-gravity#1

Also read: http://www.indiegogo.com/projects/282006

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About fromourisland

Gardener, knitter, wife, mother of 2, grandmother, and lots more.
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