Durbin

Off Grid Lighting Solutions

GravityLight

GravityLight

Durbin has partnered with Deciwatt to distribute Gravity Lights to developing countries for humanitarian aid and to help alleviate the dangers of kerosene use.

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; which then provides 20 minutes of light as it descends.

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.

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

The Basics

GravityLight is powered by the lift of a weight.

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.

The Detail

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.

The Benefits of GravityLight

+ Instant light, anytime

+ No running costs

+ No sun or batteries needed

+ Robust and reliable

For more information about GravityLight or other off-grid lighting solutions please contact Lighting@DurbinGlobal.com or phone +44 (0)20 8869 6597.

Contact Off Grid

Off Grid Lighting Solutions

T +44 (0)20 8869 6597
E Lighting@DurbinGlobal.com