I would not suggest a PC light at this point. Those bulbs are getting harder to get, and they produce less PAR then a comparable T5 light. In addition, T5 will use fewer watts I believe.
Those are T5's Poseidon.
I just bought the 24" one for my 54 gal. corner . It's hands down the best lighting I have ever owned. Very easy to use, the fans are completely silent. Awesome product. I think my tank is 22" deep and I have no problem with growth. I would say my best growth is about 15" from the light. I also have stunner strips to pick up the back of the tank since its odd shaped.
@streetrodder~nope those are CF only~although 64w 10.000k 64w 460/460 2x 1w moon leds.
But these one's I'm looking at also. I just wish they had prices. It also doesn't say if they ship or not. There's no store any where near me that sells em. http://www.aquaticlife.com/t5ho/index.html
@Poseidon: if there's any way you could find a price for me that would be great. I really like this unit! But I won't be buying just yet. Need to know how much I need to put away. The tank won't be ready for a few months yet. I'm getting the sump, over flow box and it drilled next month. Hopefully I'll have everything by the time I move.