The project started in the Philippines ... the bottles with water and bleach. They are then fixed to roofs refracting sunlight during the daytime. The second step is to build solar night lights ...

The BOI of the Philippines, an agency under the Department of Trade and Industry, has granted a green lane certificate to a solar project in the municipality of Burgos, Pangasinan province.

where during daylight hours the water inside the bottle refracts natural sunlight to produce a light equivalent to a 55-watt solar bulb — which then extends for another 10 hours at night. Originally ...