Well-done HID Ballast is an electronic control unit used to initialize arc and supply a stabilized power supply to the HID bulb during normal arc conditions. Available TYPES OF HID BALLASTS FOR MOTORCYCLE, CAR, TRUCK, BUS ETC.. 12V 35W 6A/9A 12V 45W 6A/9A 24V 35W 6A/9A 24V 45W 6A/9A D2S / D2R 12V 35W 6A/9A D2S / D2R 12V 45W 6A/9A