I run a 2X250W MH with pc's and I can tell you the pc's are worthless. Nice for an actinic/moonlight glow after lights out but that's about it. They do not contribute at all to the overall color when the MH are on. I have found it necessary to supplement with T5's as well to achieve a nicer color.
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Red Coral Online Store 
www.redcoralaquarium.net
45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp
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