Wednesday, February 6, 2013

Gravity light

GravityLight: lighting for the developing countries from Therefore on Vimeo.


The people at deciwatt.org wanted to develop a device that would provide free light in developing countries.  They asked for $55,000 in support donations at indiegogo.com.  The pledges have amounted to $400,000.

It is basically a device that works by suspending a bag full of rocks and letting gravity turn a small generator which powers an LED.  Current production cost is about $10 per unit and with continued R&D they hope to bring the cost down to $5.

Lighting in rural areas of developing nations is largely provided by kerosene.  This is an expensive proposition as well as being dangerous and unhealthy.  The cost of a gravity light can be returned in cost savings over kerosene in about three months.

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