About this product :

GravityLight is a gravity-powered lamp designed by the company Deciwatt for use in developing or third-world nations, as a replacement for kerosene lamps. It uses a bag filled with rocks or earth, attached to a cord, which slowly descends similar to the weight drive in a cuckoo clock. This action powers the light for up to twenty minutes.

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.

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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.

It’s important that the drive system is protected should an extremely heavy load be applied – we found that children really enjoyed swinging on the GravityLight bag!

An entirely novel way of protecting the system has been designed for GravityLight. It will allow an overloaded bag to descend to the ground in a safe and controlled manner.

We have carried out an extensive series of product life testing. We experimented with different materials, gear geometries and arrangements and now have a design which will go the distance!

Opinions of techiesms :

This is a brilliant device which uses gravity to light up a lamp, the technical knowledge they have used is just beyond words. Making it available for everyone who do not have access to electricity or are too poor to afford electricity in the remote areas shows the power of science and technology. I think they have done a marvelous job. It may have a rough procedure to follow but that should not be a problem. Hope to see more awe-inspiring gadgets like this.

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