Solar bottles of light

http://www.motherearthnews.com/green-homes/solar-bottles-of-light.aspx

From boingboing this morning

 

"The slums of the Philippians are getting an extreme home makeover in the form of two liter bottles in their ceilings. The bottles function as 60-watt lights powered by 100% solar energy. Refraction is an amazing thing, if you drilled a hole in your ceiling light would drop directly through the opening in a straight line casting a shadow on the ground in the shape of the hole. By placing a bottle filled with water into the hole, the light is refracted by the water and emitted at 360 degrees like a light bulb. Light bulbs are taken for granted in America, yet are luxury item for the Philippians slums. The two liter bottles filled with water and a small amount of bleach to keep algae from growing, act as a light in the often-unlit slums.…" http://community.greencupboards.com/2011/07/14/2-liter-bottles-of-light/