An extremely cheap alternative to other light source options has been introduced in Brazil and the Philippines using basic everyday materials to create light which can last for over 2 years for domestic use. This very plain and simple bright concept is bringing light to many poor people without access to electricity. The idea generates light from solar energy equivalent to a 55 watt bulb from a single plastic bottle!!
The materials needed are 1.5 litre plastic bottle, clean water, 3 table spoons of common bleach and a rubber seal. Its working principle is dumb simple: The water defracts (scatters in different directions) the individual rays of sunlight allowing it spread throughout the house instead of focusing on one point. The common bleach keeps the water pure and free from microorganisms.
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