We Offer Capacitors in HID ballasts that are used to improve power factor, regulate voltage, and help with lamp ignition and operation in HID lighting systems (e.g., metal halide, HPS lamps). They are typically found in power factor correction circuits (to reduce energy loss), ignitor circuits (to assist in starting the lamp) and pulse start systems (in advanced electronic HID ballasts). Capacitors ensure efficient energy use, stable light output, and longer ballast and lamp life.