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 160 Watt projects UVB up to several feet from the lamps surface and is ideal for large terrariums or bird aviaries. Features include quality nickel plated threads to prevent corrosion, and a full one year warranty. Please note movement of the bulb reduces its life. Please make sure a high quality ceramic fixture is used.