From SmartPlanet.com
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Video: World’s cheapest light bulb shines in developing regions
By Tuan C. Nguyen | July 29, 2011, 7:35 AM PDT
http://www.smartplanet.com/blog/thinking-tech/video-worlds-cheapest-light-bulb-shines-in-developing-regions/8004
A plastic bottle is filled with water and bleach. That’s it. That water refracts light from the sun in all directions and disperses the sun’s rays that would otherwise go in one direction inside the home. The bleach prevents algae and particle build-up, keeping the water clear. Once the “light bulbs” are assembled, they are put through holes in the roof. The process can be done in an hour.
So far, workers have installed 10,000 of them in homes in Manilla in the Philippines. The obvious drawback is that the light bulbs are only functional during the daytime, but even then, installing them translates to tremendous costs savings for families who can ill-afford what they consider a luxury.
more: http://www.smartplanet.com/blog/thinking-tech/video-worlds-cheapest-light-bulb-shines-in-developing-regions/8004
http://www.youtube.com/watch?v=6cSsIqMcROA&feature=player_embedded#at=20
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