I have always been a halide fan. I know t-5's do teh job and have seen some awesome tanks lit by t-5's. I at one time had a 300 gallan tank, two 60's, a 180, four 125's a 90 and a 75 gallon tank. I had 21 halides and three 8 bulb tek lights over these tanks. Side by side comparison just from the looks of the t-5's and halides was no comparison. Every halide tank looked better than the t-5 tanks. I ran all the tek lights about six months and just never liked the look compared to the halides.
When I go the the LFS in town and look at the t-5 tank and the halide tank I am still in love with the halides. I know the bulbs are better than when I had them but I just personally prefer the halide look. Probably always will.
The one tank I witnessed lit by led's was awesome looking and I consider this a temporary thing until Leds improve. To me that is the direction I want to go. I will use the t-5s to light my fuge if I ever do a bigger tank.