The Exo Terra UVB200 high output bulb emits a specific UVB spectrum designed to promote optimal Vitamin D3 photosynthesis. Ideal for desert setups, this powerful bulb simulates natural conditions for reptiles with very high UV requirements. The UVB200 boasts an exceptional D3 yield index which promotes superior photosynthesis of Vitamin D3. This aids in the absorption of calcium, while helping to prevent the onset of metabolic disorders such as Metabolic Bone Disease (MBD). Lastly, the Exo Terra UVB200 offers enhanced UVB penetration making it perfect for use in taller terrariums and terrariums with denser screen tops.