See THE LIGHT OF LIFE at
[http://www.facebook.com/l/fAQCSLWiwAQBUYyGeHhmyOl93dq3hXPEcd7889Q6NfBO99A/www.youtube.com/watch?v=ziT3XYE2xSA&sns=fb]
Here is a brilliant use of solar energy as a light source, without using any conversion to heat or electricity.
Many hut and shanty structures have roofs and walls hat do not permit any natural illumination. Here, a light gathering water-lens was improvised with a plastic bottle was filled up with water and inserted through the roof. Given the protruding shape of the bottle's neck, sunlight from about any angle is absorbed into the bottle, concentrated via refraction and diffused by the lower part of the bottle glowing in the dark.
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