Some years ago, product designing engineers Martin Riddiford and Jim Reeves were asked if it was technically possible to build a light for less than $10 to replace kerosene and sun-powered lamps. The idea was to come up with an inexpensive alternative to kerosene lamps and lighten some of the remotest and darkest parts in the developing world.
It took Riddiford and Reeves more than four years to develop GravityLight that works by harnessing the power of weight and gravity. It produces about 25 minutes of uninterrupted light from the force exerted by the weight of a bag of sand, stones, soil or anything heavy. GravityLight produces zero emission and is incredibly easy to run, does not contain any battery and has no running cost. It generates extremely low power (less than two deciwatt) but the specially designed LED bulbs are capable of producing superior light to the majority of traditional kerosene lamps.
Currently, this LED lantern is being tested in more than 25 countries and both the creators are all set to begin mass-production this year.
Info Source: www.deciwatt.org, www.therefore.co.uk
