EYE Lighting: The 150W CMH lamp is designed to perform in all mounting positions. With 24,000 hours of life, it delivers four times the life of M175 and M250 probe-start lamps when operating in the horizontal position. It delivers 3700K white light at 75CRI. Maintained lumens are 40 percent higher than typical ceramic or quartz metal halide lamps. Operating on standard 150W metal halide pulse start ballasts, it is ideal for replacing outdated 250W or 175W metal halide systems.