How It Works


Combining kinetic and potential energy, GravityLight works by connecting an elevated weight — filled with rocks or sand — to a pulley system that slowly powers a generator as the weight falls to the ground.


Instant Light

It takes just a few seconds to lift the weight that powers GravityLight. Providing 20 minutes of light as it descends. 

No Batteries

No batteries mean that GravityLight can be stored indefinitely and there's no need to charge in advance, it's ready when you need it.

No Running Costs

As the energy generated from the device is completely self sustained, GravityLight pays for itself within months of switching from a kerosene lamp.