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GravityLight: lighting for developing countries.

GravityLight: lighting for developing countries.


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GravityLight is a revolutionary new approach to storing energy and creating illumination. It takes only 3 seconds to lift the weight which powers GravityLight, creating 30 minutes of light on its descent.

  • The GravityLight was designed to replace the use of kerosene lamps in the developing world. It uses a weight to drive a gear-train and generate electricity from the kinetic energy created. Now, a new version of this safe, cheap and convenient lighting solution has been created
  • .The original GravityLight is hung in a room and a weighted bag attached to a hook at its bottom. The bag, which is filled with rocks or sand, is winched up and then gradually descends at a rate of about 1 mm (0.04 in) per second. This powers a low-speed high-torque drive sprocket, which when run through the gear-train is able to drive a DC generator at thousands of rotations per minute
  • The process is said to generate just under a tenth of a watt, a deciwatt, which is able to power an onboard LED and ancillary devices. The LED is reportedly able to produce five times the brightness of a kerosene lamp and once the weight hits the floor, it can simply be winched back up for the process to be started again.