100 Watt M90 Quad Tap Metal Halide Ballast KitMetal Halide Ballast Cross Reference: Universal M100MLTLC30500K Advance Ballast 71A5390 001D Sylvania Ballast M100 MULTI KIT Venture V90D5932K Sola E MZA00W100 Grainger 3V555 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