An excellent article on Lighting!

This may help!

http://www.cannabisprofessionals.com/lighting.htm

Great info, love the nice diagram! I was thinking of buying fluros but now seeing the massive spike under the blue and red spectrum for DMH and HPS, i'm starting to reconsider.

Wouldn't a fluro in the 5000k range have somewhat of a slight advantage above a 4200k one? looks like theres a slight peak in the opposite direction.