LED Lamp, 50W, Bulb: Shoebox/Wall Pack, Base: Mogul Screw (E39), Lumens: 6079, Type V Optics, CRI: 81, Color Temperature: 4000K, Rated Average Life: Up to 50,000 Hrs. Replaces 175 & 250W MH Lamps. NOTE: Operates with Pulse Start and Probe Start Magnetic 175w & 250w Metal Halide Ballasts Only.