Just my opinion, but I think mcgyvr alluded to it in his first post. If you are hoping the t5's will help with coral colors, I think you may be very disappointed. I've recently been trying different t5 bulbs with my leds and I'm not very happy so far. I've used a 6500K, a Coralife 10,000K, Giessemann 15,000K and a Bio Tek 20,000K & UV combo led retro fit.
I think all the t5's made the colors in my tank look more pastel or even flat as opposed to having pop with the leds. I'm using the Bio Tek retro fit led bulb as it looks the best. But I'm using it at the back edge of the tank when what I wanted was something at the front to reduce shadows. I'd rather have shadows than corals that all look washed out. But that's just my opinion.
BTW, they also wash out the shimmer if you have any.