This Industrial Performance MH400/U/T15/10K is a 400W metal halide HID lamp designed for high-output lighting applications requiring bright, crisp illumination. Featuring an E39 mogul base and T15 bulb design, it installs easily into compatible fixtures using an M49 ballast system. Delivering approximately 25,000 lumens of 10000K daylight white light, this lamp provides intense, high-clarity illumination suitable for specialized applications where strong blue-white light is desired. Its universal burn position allows flexible installation in a variety of fixture orientations. With a rated life of up to 10,000 hours and a 9.75" overall length, this HID replacement bulb offers reliable performance, consistent output, and efficient operation in demanding lighting environments.