2-Liter Bottle as a 50 Watt Light Bulb

submitted by Bill Greenberg

welldonestuff.com - 2013/01/2

Here’s a way to brighten up enclosed spaces in an environmentally friendly way. The power of the sun is harnessed using a bottle full of water. Quite simply they’ve used 2-liter soda bottles. They’ve been filled with water along with two caps worth of bleach to keep microorganisms out. The cap is then covered with a film canister to protect it from the sun. They are installed through holes in the roof, and in full sun they put out the equivalent of a 50 watt incandescent light bulb.

http://www.welldonestuff.com/2013/01/2-liter-bottle-as-50-watt-light-bulb.html

http://www.youtube.com/watch?feature=player_embedded&v=_zMAWztZ6TI