Dustin;

I'm pretty sure there are some online articles comparing the spectral output of various MH bulbs by Sanjay Joshi. I have an old one in an issue of Marine Fish and Reef that John Moffet gave me before he left town. Anyhow, I bet all the info is online in Advancedaquarist.com or reefkeeping mag. He's really thorough about describing the relative outputs and color of these bulbs. Might help you select a bulb.

Matt