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So I'm looking into the Sunbrite LED system (info here) and I noticed they have a UVA LED bulb for SPS. What exactly is the point of the UVA lighting and how would this differ from a a normal LED?
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You're correct, the UV lights do emit a very faint violet light. Have you heard anything about this spectrum damaging coral tissue?UV-A is 315nm - 400nm, so the typical 405nm LED bulbs you found on your fixtures, aren't exactly UV-A. It's close to UV-A but not quite, I'd just call it violet, real UV-A light is not visible to the human eyes, but the violet bulbs you saw in your LED fixtures should be giving off very dim violet light since it still have some blue spectrum in it.
I've yet to find any real 420nm LED bulb, most that advertise they're 420nm are usually just 405nm or lower, because there're more applications that need LED bulbs of those spectrums (legal tender watermark checker, black-light T5 replacement, etc.), however 420nm is mostly used in photosynthesis applications only such as plant growing and used in our reef aquariums.
You're correct, the UV lights do emit a very faint violet light. Have you heard anything about this spectrum damaging coral tissue?