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IPFS News Link • Science, Medicine and Technology
By taking advantage of an immutable force, the GravityLight may be the most reliable electric light source of all. A person simply
lifts a 22-pound bag of ballast up to the base of the device; the weight
falls over a period of 30 minutes, pulling a strap that spins gears and
drives a motor, which continuously powers an LED. Peripheral LEDs can
be attached to focus light on certain spots. DeciWatt is field-testing
units to replace kerosene lamps in developing countries and plans to
sell them there for $10 next year.
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