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I'm no expert I think it depends on the spectrum of the light and the Par. It's not always about the number 10k, 20k etc. I could really wrong though.
Some corals thrive with different colors say blue, royal blue etc, some like a full spectrum of lighting. But I think you'll need some white light in there somewhere.
Again I could be way off but I thought I just read something in the new aquarium magazine.