400 Watt M59/H33 Quad Tap Metal Halide Ballast KitMetal Halide Ballast Cross Reference: Advance Ballast 71A6071 001D Sylvania Ballast M400 MULTI KIT Universal Ballast M400MLTAC4M500K Venture V90D6413K Grainger 1A029 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