How It Works
GravityLight is powered by the lift of a weight. 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.
It takes just a few seconds to lift the weight that powers GravityLight. Providing 20 minutes of light as it descends.
As the weight falls it turns a gear train, driving the motor that powers the LEDs.
GravityLight doesn’t need batteries or sunlight and costs nothing to run. It takes seconds to lift the weight that powers GravityLight, creating 20 minutes of light on its descent.
Fill the bag with weight (about 12kg)Lift the bag using the orange cordBag falls slowly creating light (about 20 mins)When the bag reaches the ground it can be lifted again.
GravityLight is installed to provide a 6ft/ 1.8m drop of a 12kg weight. This weight is lifted by a person pulling the orange cord. A pulley system means the weight only feels like 3kg. Once lifted, the weight then falls very slowly (about 1mm / second).
This movement powers a drive sprocket, which rotates very slowly with high torque (turning force). A polymer gear train running through the product turns this input into a high-speed, low-torque output that drives a DC generator at 1600 rotations per minute.
This generates about a tenth of a watt to power the onboard LED and two SatLight LEDs. Together these produce a light more than 5 times brighter than a typical open-wick kerosene lamp.
Once the weighted bag reaches the floor (after 20 minutes), it is simply lifted to repeat the process.
Gravity light available at online store. it’s price starting from just Rs.80.