175 Watt M137/M152 Pulse Start Quad Tap Metal Halide Ballast KitMetal Halide Ballast Cross Reference: Sylvania M175 MULTI PS KIT GE GEP175MLTAC3 5 Universal P175MLTAC3M 500K Advance 71A5593 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 limiting the current that can