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Interested too. But carbon arc lamps put out a lot of UV , fluorescent less, led almost none at the same intensity.
There cyano in every type.
I just had this vision of true UV lamps that are used in UV sterilizers/water clarification in a array above a DT, To combat cyanobacteria. Crazy thinking, I must say. Don't think that would bode well for corals, even short term. Lol