5 TAP BALLAST KIT FOR 250 WATT METAL HALIDE OR MERCURY VAPOR BULBS - ANSI CODES M58 OR H37 - 5 TAP OPERATION AT 120/208/240/277 OR 480 VOLTS - Bulborama offers premium quality Industrial Grade HID ballast kits, manufactured for optimum performance. All Bulborama ballasts and related parts comply with the OEM requirements of the world's top light fixture manufacturers and are regularly specified by architects and retrofit contractors.