What if I told you there is a light on the market powered by a bag of rocks (or sand or anything of mass that fits)? As the bag descends it activates a generator through a gearbox which provides direct electrical power for a single LED. Not only that, up to 4 lights can be connected to the main unit and are powered by that same bag of dirt. GravityLight sustainable lighting power is determined by the weight of bag filler. And aside from a noble mission to provide lighting to those that don’t have safe or economic access to it, GravityLight is a clever off-grid, non-solar, emergency light for people in the first world as well. Read More