T5 10.0 UVB Reptile Light Fixture, T5 UVA UVB Light Tube Lamp Blub 8W 12″ for Bearded Dragon, Tortoise,Desert Lizards,Leopard Gecko,Reptile & Amphibian Lamp. Special Feature: T5 10.0 UVB fluorescent lights emit 10% UVB and 30% UVA,supporting reptiles in producing vitamin D3 to prevent bone disease.They also help maintain optimal basking temperatures, stimulating activity and promoting overall health.