The Aerovox Z93S4021M01A3 320 Watt Metal Halide capacitor is designed to operate in the high temperature environments found in typical HID lighting fixtures. Aerovox oil filled AC Lighting capacitors are constructed using controlled manufacturing processes and high quality materials. The capacitor section is made with metalized polypropylene film, wound on a core with precision winding machines to a capacitance tolerance of 3%.