I run 2x250 Watt Iwaski's w/ 2x110 Watt VHO Actinic's over my 90 gallon, and I can tell you... When looking strictly at the light, with the hood opened, the combination produces a nice, white light from the halide's and a blue color from the actinic's (not that you'd hardly notice them...).
When I close the hood, and crouch down, looking up at the lights through the water and the glass... thing appear to have a yellowish cast...
What's that tell you?
Seriously, look at the lamps by themselves, Put a piece of white paper (look at the paper outside in daylight first), and tell me what color you think those bulbs are. Then put the piece of paper behind your tank, on the back or side wall's, so that you can view the paper through the glass and water at the same time.. what color does the paper appear to you now?
- Mac