Unfortunately i have to disagree mr x. I have friends that have very good led fixture and i have not seen the same results as a metal halide. T5 grow sps corals much slower than metal halides and from what i have seen so do leds. I also have a smaller tank that runs on t5 and the growth rate of my sps corals is not the same as my other tank with metal halides. Dont get me wrong i think that leds are great and i know they can grow sps corals good but not at the rate metal halides can. I personally dont think that led tech has reached where it needs to be yet. I believe soon they will be able to get the same results as metal halides but not right now.