I too am going through the same delemma, I am getting ready to set up my 120 gallon 24" deep tank, and I have no idea what lights to go with now. I would like the performance of MH
lights, but the huge energy drain (and wallet drain) and waste heat make me want to go with a Power Compact setup instead. I have a friend who used to own a LFS
and he keeps telling me that PC
lighting is the way to go, the bulbs last longer, the cost per hour is lower, etc, etc. But then I come on here and I hear people saying just the opposite and im torn. I trust my friend but I also trust you fine people on AA, who have shown themselves to be incredibly knowledgable. <sigh> I know that no matter what I decide to do, I will end up kicking myself in the butt.....