The Zoo Med Mini Deep Dome Lamp Fixture is designed for use with basking lamps, UV lamps, and heat lamps. It is contructed with an extra long reflector dome that extends beyond the face of the lamp, preventing the lamp from "sticking out". Features include: a ceramic socket designed for use with lamps up to 100 watts, a polished aluminum dome for maximum light and heat output (increases output by up to 30%), and an in-line on/off switch for greater convenience. This product is NOT designed for use with ceramic heat emitters. 5.5" dia.