I'm quite surprized at the amout of information floating around the net on this subject. This is all quite intriguing as I am still a newbie. I'm still on my first cycle. I have got a couple more links for you that are worth the read.

bcgrowers title

http://www.onlinepot.org/medical/opticsandthc9M.pdf

http://marijuanaoptics.fileave.com/0220decoy.pdf

I think I'm going to invest in a supplementary UVB light.