Exo Terra Reptile UVB 200 High Output Bulb Exo Terra Reptile UVB 200 High Output Bulb – A t8 linear tube designed for reptiles with a very high UV requirement or to cover a longer depth to reach the enclosures occupants. The Exo Terra Reptile UVB200 emits the ideal UVB spectrum for optimal Vitamin D3 photosynthesis. Specially designed to stimulate conditions for reptiles with very high UV requirements, like diurnal reptiles from desert environments. These areas receive direct unfiltered sunlight with high levels of UVB. The significantly high Vitamin D3 yield index results in increased vitamin D3 photosynthesis. This to aid calcium absorption and also prevent metabolic diseases. The extended UVB penetration makes this bulb the ideal choice for taller terrariums or also terrariums with denser screens. Combined with Exo Terra’s new UVB lighting app the right lighting requirement is no longer an educated guess but can actually put the onus on the keeper. This will also allow for better accuracy between keeper and retailer. All of the new ET lamps have 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 also distance related information like; UVB output – Photosynthesis – Ferguson Zones and Exo Terra Reptile UVB CHart. The longer sizes can also be placed on multiple terrariums.