This is a simple,low cost/no cost innovation that could light up homes in the rural and remotest parts of Nigeria.All you need is a water bottle,fill with water & some bleach (to prevent algae),create a hole in the roof of the house and insert the bottle/plastic container and voila!You get up to 50 to 60 watts of light with the help of the sun which charges the particles creating a chemical reaction making the bottle illuminate as strongly as a 60 watt electrical light bulb.The light is bright white.
See illustration;
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https://www.youtube.com/watch?v=kHTD_RX3J2I[/url][/flash]

http://www.youtube.com/watch?v=kHTD_RX3J2I