I give my Pacman/Pixie frogs and Smooth Sided/Cane Toads UVB and they seem healthier.
My ball pythons don't care either way--prefer to hide from the light.
When I kept leopard geckos and I offered UVA and UVB they would stay in the most comfortable temp area-regardless of lighting.
My mother still has one of my first leopard geckos I hatched over 20 years ago (born with a deformed tail). It has never had UV, but, it does always have a small bowl with calcium supplement/D3 available. Age is not always an indicator of health, but, I think it suggests that UV is purely optional with a supplemental diet.
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