Soda Pop Bottle Solar Light

This is a really simple and cheap idea to bring solar light into a dark room.

A regular 2 litter polycarbonate soda pop bottle is fitted into a sealed hole in the roof.  The bottle is filled with water and a bit of bleach.  The sun shines in the top of the bottle, through the roof opening, and then the bottom of the bottle spreads the light around the room.  It is said to work much better than simple window in the roof.

http://www.builditsolar.com/Projects/Lighting/lighting.htm#BottleLight

Gary