Suitable for reptiles， amphibians， fish， mammals， etc. With 1 spare 50W bulb. Reptiles need UVB rays to absorb and metabolize calcium， which is essential for bone growth and the prevention of metabolic diseases. High UVB output similar to natural desert environments where direct sunlight and UV exposure is greater， ideal for all desert dwelling reptiles. 360 rotating light clip ， easy to install and convenient to use. The included lamp holder can be used with multiple E27 lamps， such as fluorescent， incandescent， ceramic， UV， halogen， LED， etc.