I can't say yes, because I have never used them yet. I use VHO's on my reef tank(120gal.) along with MH(14K's). I do have a T5 unit for the 29gal. I am putting upstairs, that will house some anenomes and some of the grow out from my tank downstairs. I have only read good things about the T5's, as long as they are individually reflected, and can be overdriven(will run at or close to VHO wattages for same length bulb) with IceCap ballasts(supposedly doesn't cause premature burnout). I can't say for sure yet, like I said, have not actually tested them yet.
Everyone has said they are good, especially for shallower tanks, less than 20".
Hope this helps a little, probably just sparks new questions though.
Matt