The Exo Terra Repti Glo 10.0 UVB150 Compact Fluorescent Bulb emits UVB light, essential for promoting calcium metabolism and vitamin D3 synthesis in reptiles. With a 10.0 UVB rating and a power output of 13W, this bulb provides optimal UVB levels for reptiles housed in terrariums with limited access to natural sunlight. It helps prevent metabolic bone disease and supports overall reptile health and well-being. Provides essential UVB radiation necessary for reptiles' synthesis of vitamin D3, crucial for calcium absorption and bone health. Mimics natural sunlight, enabling reptiles to engage in vital behaviors such as basking and UVB exposure. Suitable for desert-dwelling reptiles or those with high UVB requirements, ensuring they receive adequate UVB rays even in captive environments.