Many of the solutions out there are ingeniously solar powered. But GravityLight an idea from two British designers, is something completely different.
It gets its energy from gravity: a 22-pound bag of sand that gradually cranks a gear-train attached to a D.C. motor.
One lift is enough for 30 minutes of light, and recharging is as simple of pushing the weight up again.
Curated by Agostino Caniato: http://bit.ly/the-wow-factor