Because the lamps are so close together you won't get the full benefits if the T5's. Excuse the pun but they really "shine" when in independent reflectors
. Also try and find out what type of ballast it uses. I didn't see what type of lamps it uses either. Just like any other lamp, all T5's are not made equal.
All that said, might be worth a shot... it's cheap enough. Though to quote a guy of my local reef forum: "The bitterness of poor quality remains long after the sweetness of low price is forgotten"
Chris
(edit in response to the above edit
). Out of those, I'd go with the Nova Retro. The lamps are supposed to be pretty decent, and they have SLR's (single light reflectors). Nice find! I didn't even know they made retro kits, gonna have to surf around the Current USA site again lol.