I had no color separation with the LEDs 16" - 18" off the water, or since I removed the optics to reduce the intensity (and moved them down to 6")... but then I don't have sand.
I agree there are some missing spectrums, especially red in my case. I get no algae in the display at all, and almost no slime on the glass. Likely this is also effecting the corals.
I'll let you know what I think after I've added a few of Milads OCW LEDs.
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