The PowerSun UV™ is a self-ballasted mercury vapor lamp which emits UVA, UVB and heat all in one lamp! Fits into a standard ceramic socket. (No ballast needed.) The powdersun projects UVB up to several feet from the lamp’s surface and is ideal for large terrariums or bird aviaries. Features include quality nickel plated threads to prevent against corrosion, and a full one year warranty! Please be aware that these bulbs produce UVB designed for reptiles. When using with birds and mammals use caution due to the high amount of UVB Rays and a distance from mammals and birds. To much UVB can be harmful to mammals and birds.