I'd personally not use the UVB. Not only do BPs not increase their D3 levels with UVB (according to the only study of the species I'm aware of, here), but providing UVB to those species that don't really need it (i.e. those animals that are not basking thermoregulators) are reported to have hiding and feeding problems, and I've experienced these same issues myself with providing excess UVB to box turtles and Rhacodactylus geckos.
If you do use UVB, it should be metered to provide a level of no more than 0.7 UVI for ball pythons.
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