Exo Terra Reptile UVB 150 Desert Terrarium Bulb Exo Terra Reptile UVB 150 Desert Terrarium Bulb – The New and also improved range of UVB linear tubes from Exo Terra replaces the popular Repti Glo range. Replacing the ET Repti Glo 10.0 T8 tubes the new ET Reptile UVB 150 T8 tubes do away with the percentage terminology of linear tubes and instead focuses on the average UVB output, based on a basking distance of 10cm from the lamp. These locations receive more direct sunlight, therefore desert reptiles are more exposed to UV radiation than any other type of reptile. This blub can also be used on terrariums with denser screen covers to ensure sufficient UVB penetration. Denser screens can filter out up to 50% of the UVB rays. The high Vitamin D3 yield index ensures vitamin D3 photosynthesis to aid calcium absorption and also prevent metabolic diseases. No longer should you have to rely on the 10.0 principle which only vaguely indicates the UVB output of the lamp ranging between 280 – 320nm. The 150 terminology focusing on the 290 – 310nm wavelength which is the range responsible for vitamin D3 synthesis. All of the new ET lamps have also been designed for maximum vitamin D3 photosynthesis by concentrating the UVB output near the 294nm wavelength (the wavelength responsible for peak D3 production). The packaging includes all necessary information for shoppers to make the right choice. Includes, Full Spectral Graph, UV Spectral Graph, Reptile Bulb Rating System and distance related information like; UVB output – Photosynthesis – Ferguson Zones and Exo Terra Reptile UVB CHart. The longer sizes can be placed on multiple terrariums.