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From my research, those reviews are likely the result of people not properly acclimating the coral to the light or using too much of the light. Plenty on here have Viparspectra with success.If you look at a lot of the reviews it says it was such a harsh light. People’s coral bleached and others shrank up I was really liking this until I read the reviews a lot of good ones but if you look at the not so good a lot of people agree on the same thing.
The key is starting at low percentages (like 10% blue and 1% white) (don’t quote me on this as I have limited LED experience) but I believe BRS has a few videos on the blackboxes.