Average Rated Life: 10000 hr. | Brand Name: Westinghouse | Bulb Base Type: E39 (Mogul) | Bulb Shape Type: ED28 | Bulb Type: Metal Halide | California Title 20 Compliant: Yes | Color Rendering Index: 65 CRI | Color Temperature: 4200 K | Commercial or Residential: Commercial | Dimmable: No | Finish: Clear | Lamp Designation: ED28 | Length: 8.3 in. | Light Color: Cool White | Lumens: 20,500 lumens | Number in Package: 1 pk | Packaging Type: Boxed | UL Listed: No | Watts: 250 watt | Indoor or Outdoor: Indoor The Westinghouse (MH250/U/M58/E) Mogul Base 250W Clear ED28 4200K HID Metal Halide Light Bulb provides efficiency and long life up to 10,000 average rated hours. * * Metal halide HID light bulbs produce high light output, ideal for various commercial and industrial applications where color rendering is important. For use in enclosed metal halide fixtures only, can be used for indoor and outdoor applications. This metal halide light bulb features a mogul base and requires ANSI ballast M58 for correct operation. * * This light bulb contains mercury. Dispose of according to local, state or federal laws. Westinghouse is a trusted global brand. Westinghouse knows lighting and offers products with exceptional quality, reliability and functionality. Product reference number 37021. | 250 watt, clear finish, mogul base, universal operating position | Metal halides HID light bulb offers long life and high efficiency | Bulb life of 10,000 average rated hours