Light Bulb:(1)100w ED17 Med MH Dusk to Dawn 100 Watt Metal Halide Industrial Grade Area Light Heavy duty die-cast metal housing with high impact lens. Nighttime ON/Daytime OFF. Replaceable Twist-lock photo control with optional cover for more control. Metal guard attaches (without tools) to protect lens and bulb from damage. Use where energy efficiency and wide area lighting are important. Fixture operates on standard 120v 60 Hz household current. Easy installation: Ez-mount bracket and Quick-connect wiring system.