This Replacement for Sylvania 64737 MSP360/SS/BU-ONLY is a 360W metal halide HID lamp designed for high-output, reliable performance in commercial and industrial lighting applications. Featuring an EX39 base and BT glass bulb, it installs easily into compatible fixtures using M59 or M165 ballast systems. Delivering approximately 36,000 lumens of 4000K bright white light, this lamp provides powerful, crisp illumination ideal for warehouses, gymnasiums, retail spaces, and large-area lighting. The base-up only (BU ±15°) design ensures proper operation in approved fixtures. With a rated life of up to 20,000 hours, this HID replacement bulb offers long-lasting durability, consistent performance, and reduced maintenance for demanding lighting environments.