Topaz?s 80W, 5000K Post Top Light with E39 base, are power selectable. Choose from 3 power levels in a single fixture for adjustable lumen output. These energy efficient long-life lamps are a perfect replacement option for Metal Halide, High Pressure Sodium, Mercury Vapor, and Fluorescent lamps. These lamps feature: thermal sensing technology that reduces power in extreme temperatures to protect the lamp, Ballast bypass operation ? no ballast or external driver required, and a 360? beam angle providing full light distribution. These lamps were designed for commercial indoor and outdoor settings such as acorns, post top and high bay applications and are suitable for open or enclosed fixtures in dry or damp locations.