When the bottle is hung through a hole in the roof and filled with water and bleach, the bottle refracts sunlight and can produce as much light as a 50- or 60-watt bulb. Veronica Wanjiru (24), a ...

While the workers install the light bulbs in her home ... The workers fill the bottle with purified water and two caps of bleach that prevent the growth of mold. The bottle is held in place ...

provides light to poor households around the world with limited or no access to electricity ― by collecting plastic bottles, filling them with water and bleach, and sticking them into roofs.