Hi to all, need solar light for free?
In this post, we show how reuse plastic bottles to build solar light bulbs (like solar light tube).
Each bottle lights up like 40-60 watts.

Ingredients:
1 Plastic bottle (2L coke or water bottle)
2 L water
A little chlorine
1 Black cap (packaging of photo spool)
Recipe:
1. fill the bottle with water and add  a little chlorine (chlorine prevents photosynthesis in the water)
2. use the cap bottle to close the bottle
3. use the black cap packaging over the cap bottle (to protect it)

Installation:
1. make a hole in the roof (bottle diameter)
2. place the bottle (3/4 in, 1/4 out),
3. cement paste to prevent water leaks

See the demonstration video on youtube:

http://www.youtube.com/watch?v=VK8e84rT978