my tank's 48x24x24 and I keep lps and softies and such, and my 8 bulb 4' light fixture is more than adequate. I'm planning for some sps this summer because the upper regions of the tank are a no-fly zone for the softies, it's so bright. I'm quite satisfied with T5 bulbs. I have the sunlight supply Tek light fixture.
I'd recommend making sure you have two separate ballasts, because I had to change my lighting schedule to 12 hours actinic and 9 hours bright.
Also, we're gonna be getting the Korallen Zucht bulbs in canada very soon. Been reading bout them for a bit, and it seems some people in europe are going to T5 and never going back because of these bulbs. The pictures are outright amazing
