UVB is beneficial but it's not necessary, natural light cycle is sufficient imo, I don't use any extra sources of light for my bp, and the breeder I got Solidus from didn't recommend doing so, either. It should be enough that the room they're in is light during the day and dark during the night, but I guess honestly like most things in bp keeping, it comes down to your own preference - - so if you want to invest in artificial lighting, go ahead, at least there's no harm in it.
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