175 Watt M57/H39 5-Tap Metal Halide Ballast KitMetal Halide Ballast Cross Reference: Advance Ballast 71A5570 001D Universal Ballast M175ML5AC3M500K Sylvania Ballast M175 MULTI KIT (Quad Tap ONLY) Venture V90D6111K (Quad Tap ONLY) 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