Bob,
What I'm reading is that the coral is using the blue light. There for if your supplement blue light the coral is using it. I don't think it gets any clearer. If I'm going to put a bulb over my reef I want it to have the spectrum that is most usable by the animals I keep. And by this statement it's blue light.
The study also determined that low levels of blue light can acheive rates of light-saturated photosynthesis(peak operation) that are equivalent to those reached by corals grown in full sunlight.
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Jamie Cross
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