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A Solar Bottle to Brighten Up a Day

Have you heard? Plastic soft-drink or water bottles can create cheap lighting. That’s what “Liter of Light”, an organization created by graduate students from the University of St.Gallen in 2011, is doing. Its aim is to “spread an alternative cheap source of light.”

The technology is incredibly simple. It consists of a 1.5 liter PET bottle filled with purified water and 10 ml of bleach. A special glue is used to attach a metal apron around the middle of the bottle so it can hang from a hole in the roof. The bleach in the water keeps the water clean and clear so no algae grows in the bottle. That’s all it takes!

See for yourselves how solar bottles have brightened up the lives of people in the Philippines. The reaction with sunlight generates 50 to 60 watts of light in the very dark interiors of simple Philippine homes.

How water bottles create cheap lighting in the Philippines

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