I'm pretty happy with the performance i get from my t5's. I use to run 400w halides. Big thing to consider is the reflector. Stick with the icecap reflectors and ati brand bulbs and you won't have any regrets.
Cheers,
Kurt
75gal 6x54w t5's on icecap slr's 3 blue +, 1 pro color, 1 ge 65k, 1 uvl spuer atintic, iwaki 40rlt return, mak 4 on closed loop to om super squirt, mak 3 on etss reef devil, jbj artica chiller, aquamedic calcium reactor, DIY Kalk reactor, DIY media reactor, currently running half phospahte/half carbon.
Live in Uvalde, Texas. On the fish hatchery!