This UVB 10.0 has a very high UVB output similar to that associated with desert environments. Desert locations receive more direct sunlight than any other because of fewer clouds, less air humidity and no plants or trees to provide shade. Therefore desert reptiles are more exposed to UV radiation than any other type of reptile. This bulb can also be used on screened terrariums or terrariums with dense screen covers to ensure UVB penetration.Package dimentions:2.75″x2.75″x6.3″ Ideal for all desert dwelling reptiles Optimal UVB & UVA output Simulates appetite, activity and reproductive behavior Provides necessary UVB rays for optimal calcium metabolism Combine with natural light or reptile vision for optimal visual light output