Sorry, been in the middle of packing/moving and sorting out life. The readers digest version is:
80 Cree XR-E emitters, 40 cool white and 40 royal blue driven by Meanwell ELN-48P dimmable drivers at just under 1000mA using 60 degree optics. I also added a few bare green emitters for colour rather then PAR. Super beefy overkill heatsinks (the fixture probably weighs about 50 pounds) and three low RPM fans keep them very cool for long life. Arduino based controller for dimming, sunrise sunsets etc.
With the fixture mounted about 10 inches above the water I was getting well over 500 PAR 10 inches into the water so plenty of light to support SPS etc. Nice shimmer like MH and no heat emitted into the tank. My temps stayed within half a degree of 78 all the time.
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