I have that light. It's ramping is really nice. As for your question about sustaining coral, I'm only using it to supplement my t5 lights on my 265 gallon at this point. Stupid me initially thought it would be enough for my tank. My zoa's and mushrooms did OK even in that situation. The anemone? Not so much.
However, I used to have a 50 gallon with those corals you have that did just fine with Current True Lumen lights, and I swear the Orbit looks brighter when I compare them on my tank I have now.
This may be of no help at all, but just in case no one chimes in you have something