GravityLight-prototypeThe GravityLight gets power from the slow lowering of a weight. All it takes is enough elbow grease to hoist the bag, and you can light a room with nothing but a bag of sand.

The need is enormous: more than 1 billion people still lack electricity.

Two socialpreneurs wanted to find a replacement for the dangerous and dirty kerosene lamp–which is also relatively expensive to run, highly polluting, and comes with multiple health and fire risks.

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. For free.

The innovative prototype for GravityLight is being crowdfunded on Indiegogo, and has already raised almost $305,000 to fund the tooling, manufacture and distribution of at least 1000 gravity powered lights. With the test distribution they will evaluate feedback and move toward mass-producing a finished product, the price of which they say could be kept to $5 per lamp.

(WATCH the company’s video below or READ the story from FastCompany)