By Damien Gayle
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.
London-based design and innovation initiative deciwatt.org designed the GravityLight as a sustainable lighting solution for the 1.5billion people in the world who have no reliable access to electricity.
Most of these people rely on biomass fuels like kerosene for lighting once the Sun goes down, but such fuels can be hazardous to health - as well as posing a fire risk.
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