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This is a very good post.Blue is what allows the corals to grow, white is generally for our eyes only. There's been some serious discussion about whether or not white light PAR actually does anything at all. When measuring PAR for corals, the best practice is to turn off the white completely and only measure PAR with the blue lights on at their setpoint. Once that's measured, add the white back in for your likes as the coral could care less but the algae loves it!
Very well said.