1.Reptile Health. Pet reptiles don't receive UVB rays from the sun, which is essential for them to produce vitamin D3 and properly absorb calcium. 13Watt Desert UVB 10.0 CFL UVA UVB Reptile Light Bulb provide necessary UVB rays to keep them y. 2.. Easy to install with an e26 base, each 13Watt Desert UVB 10.0 CFL Reptile UVB Bulb stable UVB and UVA output with no harmful UVC output. Always keep your lamp at least 15 cm away from your reptiles. 3.Regulates Behaviors. 13Watt Desert CFL 10.0 UVB Light Bulbs for Reptile also provide the necessary UVA light which helps to regulate natural behaviors, including feeding, daily activity and movement, mating and similar activities. 4.Desert Lamp. Ideal for use with screened terrariums, UVB 10.0 Reptile Light Bulbs are ideal for all desertdwelling reptiles desert lights, including bearded dragon uvb light, tortoises and other lizard light bulb. Use them to increase natural behaviors and prevent illnesses.