This Replacement for Venture Lighting MS400W/BU/ED28 is a 400W metal halide HID lamp designed for dependable, high-output performance in commercial and industrial lighting applications. Featuring an E39 mogul base and ED28 clear glass bulb, it installs easily into compatible fixtures using an M59 ballast system. Delivering approximately 40,000 lumens of 4000K bright white light, this lamp provides powerful, crisp illumination ideal for warehouses, manufacturing facilities, gymnasiums, and large commercial spaces. The BU ±15° burn position ensures proper operation in approved base-up fixture installations. With a rated life of up to 20,000 hours and an overall length of 8.31", this HID lamp offers long-lasting performance and reduced maintenance needs for demanding lighting environments.