The Philips HID-PV m 35 /C /C Independent electronic ballast comes complete with strain relief and runs 1x35w metal halide lamps.this ballast is available as independent (/I) for independent use on a (false) ceiling, minimal lamp power spread, microprocessor controlled, lamp end of life detection, long lifetime of 40,000 hours, lamp life is increased by up to 30% for CDM lamps, silent operation without hum it is also RoHS compliant. This Philips HID-PV is usually used in accent and decorative lighting for shops and retail, public spaces, lobbies and offices. This unit is designed for optimum system performance with Philips MASTERcolour CDM lamps.