I think Hahnmeister already said this, but the bottom line is that T5 light many extraordinary sps dominated tanks. There's simply no question that T5 can work well. I'd have to say that I'm running systems with both and I like the degree which I can influence the color of the light. You can't get that range running just MH. If you run both Mh and T5 on the same tank, and utilize a fixture for both, the T5s may not do a lot due to the heat of the MH, T5s operate best at around 95 degrees, well, in an enclosed MH/T5 fixture, they are going to get a lot hotter and hence not work as well....
It doesn't matter if it's European or American, T5s work. Americans happen to be late adopters to technology in this hobby, and the Europeans are leading the way.
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