The Philips HID-PV 20 /S mid-wattage ballast runs 1x210w metal halide lamps.this ballast is for use in outdoor luminaire, increased ballast lifetime, low-frequency electronic gear for stable, flicker free lamp operation, cage clamp terminal connections with push button release it is also RoHS compliant. This Philips HID-PV is usually used in floodlighting and shop lighting so it is suitable for indoor and outdoor use. This unit is designed for optimum system performance with Philips MASTERcolour CDM lamps.