It's sort of a cheesy version of a sun tube.
www.sun-dome.com...
You can get up to 2000 watts equivalent light with a real sun tube over the 50 watts with a plastic bottle filled with water.
Originally posted by HotSauce
reply to post by Scooby Doo
... They said something about water, bleach, and some sort of film cover. Can you explain how they are made? I might give it a try this weekend.