This Replacement for GE 64039 LU600/400PSL/T40 is a 600W high pressure sodium (HPS) HID lamp designed for powerful, high-output performance in demanding outdoor and industrial lighting applications. Featuring an E40 mogul base and T40 bulb design, it installs easily into compatible fixtures. Delivering approximately 90,000 lumens of 2100K amber light, this lamp provides extremely bright, high-visibility illumination ideal for street lighting, highways, large parking areas, and security lighting applications. Its 11.49" length ensures proper fit in compatible HID fixtures. With a rated life of up to 12,000 hours, this PSL Series HID replacement bulb offers dependable performance, strong light output, and reduced maintenance needs for continuous, high-demand lighting environments.