On the simplest level, GravityLight converts gravitational energy into light, just like its name promises. That's right, you lift a bag filled with 20 pounds of stuff (sand, earth, whatever) and attach it to a cord. As gravity pulls the bag down, an LED light is illuminated, working kind of like those hand-cranked flashlights. A braking mechanism causes the weight to drop slowly, producing about 30 minutes of light, and returning the bag to its original height "restarts" the light.
GravityLight -- Using Gravity To Bring Light To The Developing World
Singularity Hub - 23 Jan 2013 19:10
On the simplest level, GravityLight converts gravitational energy into light, just like its name promises. That's right, you lift a bag filled with 20 pounds of stuff (sand, earth, whatever) and attach it to a cord. As gravity pulls the bag down, an LED light is illuminated, working kind of like those hand-cranked flashlights. A braking mechanism causes the weight to drop slowly, producing about 30 minutes of light, and returning the bag to its original height "restarts" the light.
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