Thats fineJust the actual black lights are bad.
Prolonged exposure in humans is also harmful. But if you are a tiny snake and under a black light all day....UVA light is much lower in energy and does not cause sunburn. UVA is capable of causing damage to collagen fibers, so it does have the potential to accelerate skin aging and cause wrinkles. UVA can also destroy vitamin A in the skin.