is this the one you were talking about?
EVO Quad 48" LED Aquarium Light Marine Coral Reef Saltwater Lunar 64x 3 Watt 3W | eBay
You are exactly right, I think the 10000K white is a bit way too much. This is a great FOWLR fixture in my opinion.
I also would concern what type of LED chip it use and lack of information on how much current it run thru the LEDs.
For LEDs, it is not how many watts per LED. It really depend on the current that run thru it. In this case, when it runs with a lot of white and has 64 LED chips, but only provides ~8500Lumens. It is actually less than my 90W CREE fixture which only has
Cree XPE Blue 3 Watts x 4
Cree XPE Royal Blue 3 Watts x 12
Cree XPG Warm White 5 Watts x 2
Cree XPG Neutral White 5 Watts x 6
And my fixture gives out about 13000 Lumens with a lot more blue LEDs.
Lumens mean nothing to the coral growth, but that can pretty much tells u the LED is not running thru max current, so 3w per chip might turn out to be about 1.5w per chip or less