400 Watt M59/H33 120/277 Volt Metal Halide F-Can BallastMetal Halide Ballast Cross Reference: Advance Ballast 72C6082NP Sylvania Ballast M400 120 277 F CAN Universal 1110247SCTC Sola E MCAFTJ400F Grainger 1N109 High Intensity Discharge (HID) lamps require a ballast to apply starting voltage to the lamp and establish current flow an arc between the lamp electrodes. Without a ballast, the arc will extinguish or draw increasing current until some circuit element burns up. Ballasts provide system stability by