So i switched to a ATI t5 only fixture and saw how nice that was for about 3 months. Then i found a nice Giesemann MH/T5 unit. Im running one 250w MH for about 4 hours a day and then another 5 hours of T5 only. My tank is really starting to adjust nicely to it.
Just an observation, but I will say that there is something about LEDs (in general) that some corals just do not seem to like.
I think it has less (or nothing) to do with par.
How are your corals reacting to the Sky?
I tried all LED on a nano (kessils and strips) for almost a year and just moved those corals and fish into a 50 gallon and added T5's to the mix. Corals are coloring up and, generally speaking and rather quickly, more of them seem happier, plumper, better polyp extension, more of the time. I don't see that closed up coral or three and wonder why that is going on... Water parameters are about the same, rocks the same, sand the same, and the major change was really the lighting. I set the T5 light up so bulb changes are super easy and i think i'll stay with t5's (in combo with other LEDs) for as long as i can. In a few years, i might go 100% LED. I have 200 gallon that is just about to have water in it, and the kessil 500's mounted in the ceiling with narrow reflectors could be 100% of the light sooner than later I suppose, but T5's make me less anxious.