The added stress isn't very significant, and doesn't surpass what a coral might face in the wild. Remember that if you are using 10 - 20k bulbs, you are already showering your corals in some UV-A light. This is part of what brings out their fluorescent coloring.
Producing the pigments to deal with this light is part of their normal energy budget anyway, and so I choose to let it happen.
In the end, it's purely a personal preference. I enjoy the bright blues that get produced by my (formerly) green brain corals.
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