250 Watt M58 Quad Tap Metal Halide Ballast KitSUGGESTED ALTERNATE: 250 Watt M58 H37 Quad Tap Metal Halide Ballast Kit Metal Halide Ballast Cross Reference: Advance Ballast 71A5770 001D Sylvania Ballast M250 MULTI KIT Keystone MH 250A Q HP Venture V90D6212K Grainger 3A532 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
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