Thanks, PatrikD. Absolutely... My tank looks similiar to a tank with MH, except I can change the color throughout the day.
I have an ATI 4x39 W with 2 blue+ and 2 coral+. I have one purple+ to test. I have not mounted the ATI yet. I wanted to try the Kessil only first. My aquarium is only 7 months old and I have a couple of corals. I bought one Acro staghorn to see whats happens two weeks ago. Sorry to say that there's almost no polyp extension. It's alive though and the other corals seems to do rather fine.
What T5 combo do you use?