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I think I'm getting some UV burn on the leaves closest to the UV lights, running them at bigger intervals than mfg recommendation, and the leaves affected are closer than 1 foot to the light. But other than that i love it, other leaves look great!
Is it UV-B?
Is so yep it can burn. I think it's application is something like no more than 4 hours on and towards then end of a lights on period.
It also requires some protection or at least respect for it to not look into it or get bare skin too close.
I like UVB mostly because bugs like mites avoid it like it's radiation poison and it can get some strains to frost up more than usual.
UV_A is nearly harmless and can be used for an entire lights on period and really from early veg until death. It's pretty much black light but in LED and not floro like the 70s and blacklight psychedelic posters.
When a LED company uses UV as a selling point, it's UVA diodes in there.
It's been slow and wonky for it in horticulture light development but is coming along. I'd say it's results are somewhere around 60-70% of what UVB can do. Not quite as good but far less dangerous and gives enough positivity with zero negativity to make it a worthwhile addition IMO.