The GRAVITY-Powered Lamp That Could Bring 1.5billion People Out Of The Darkness -- Daily Mail
* The GravityLight uses a sand-filled sack to pull a rope through a tiny generator to power an LED light
* It's makers claim a single pull can keep the light going for up to 30 minutes
* They hope to distribute 1,000 free to impoverished communities in India and Africa
A British company hopes to bring electric light to 1.5billion people who live off the grid with an incredible electric light that is powered by gravity.
The GravityLight uses a sack of sand to gradually pull a piece of rope through a dynamo mechanism which generates electricity to power an LED light.
A three-second pull on the rope to raise the sack will keep the LED bulb running for up to 30 minutes, its makers claim.
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My Comment: This is just the first generation prototype .... I can only imagine what subsequent innovations will bring.