This T8 10.0 Bulb Emits UVB which is essential for your reptile’s health. Many reptile species need UVB in order to produce Vitamin D3, used to help absorb and metabolise Calcium. Without adequate supplies of both nutrients, a condition commonly known as Metabolic Bone Disease (MBD) will Develop. However, with a UVB light your reptiles will grow strong and healthy! Designed to fit all standard 2ft T8 fittings.