In the Philippines, to bring sustainable lighting to homes in impoverished communities, empty plastic bottles are being installed in ceilings. Filled with water and bleach, they refract sunlight, and provide light equivalent to a 55watt light bulb.
Innovative lightbulb made from a coke bottle filled with water and bleach! Water and bleach in bottle of coke was fitted on the roof. It absorbs and reflects sunlight and is equal to a 55 watt lightbulb.