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I understandDepends. If we equate rate of photosynthesis to coral growth, then the amount of light matters. If the 'higher PAR at short duration' does not exceed the point where photosynthesis is inhibited, then coral growth should be good. If the amount of light causes dynamic photoinhibition - or worse, chronic photoinhibition, then growth might be reduced, and in worse case the coral could bleach. In hort, I don't think there is much reason to deviate from a 'natural' 12-hour photoperiod. In best case, the light intensity in this photoperiod would be just at the photosaturation point. Now, if we're discussing coloration, that's another matter altogether.
I have no intention to do this but ithas had my brain ticking for a few weeks now
Thanks
Anth