I've had a 2x Nova 4 bulb 54 watt for years now. Replacing my aquasuns every year. I just recently bought an aquatinics T5 5 bulb fixture off of Jason (great deal, thanks again). Wow, what a difference! More light than both of my fixtures combined. In fact, I have the Aquactinics fixture with 4x aquasuns and 1 x coralife 10k and it's blowing away my two fixtures together (on the other side of the 240) with 5 Aquasuns and one coralife 10k and one uv violet bulb.
Looks like I have to save up for another one on the other side. Amazing what quality ballasts can do.