Bright Idea: Light Bulbs From Plastic Bottles, Water and Bleach
08 January 2012
Sheila Royeras admires the soda bottle solar bulbs that were installed in her home in Manila, Philippines. The bulbs are made out of a soda bottle, purified water and some bleach.
This is the VOA Special English Technology Report.
Nearly a billion and a half people, mainly in Asia and Africa, were living without electricity in two thousand nine. That latest count from the International Energy Agency was an improvement. In Asia, three out of four people in developing countries had electricity in rural areas. So did almost everyone in cities. But in Africa the rate was less than seventy percent in cities, and just one-fourth of the people in rural areas.
There are many efforts to find low-cost ways to light homes. One idea is a "water bulb." This system has recently been used to brighten more than one hundred homes in the Korogocho settlement in Nairobi, Kenya. These included the home of Madina Muhsin's family.
MADINA MUHSIN: "I'm very happy. I can see the light. Before it was all dark, dark, dark. Now I am happy -- I am very happy."
Members of the youth group Koch Hope installed the water bulb. First, they filled a two-liter plastic bottle with water and a little bleach. Next, they cut a hole in the metal roof. They pressed the bottle halfway into the hole. Then they used silicone caulk to seal around it to prevent rain from coming in.
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