The philips hid pv 20 s mid wattage ballast runs 1x210w metal halide lampsthis 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