This Replacement for Venture Lighting MS400W/HOR/T15 is a 400W metal halide HID lamp designed for powerful, reliable performance in commercial and industrial lighting applications. Featuring an EP39 base and T15 bulb design, it installs easily into compatible fixtures using an M59 ballast system. Delivering approximately 40,000 lumens of 4000K bright white light, this lamp provides strong, consistent illumination ideal for warehouses, manufacturing facilities, gymnasiums, and large area lighting. The HOR ±45° burn position ensures proper performance in approved horizontal fixture installations. With a rated life of up to 15,000 hours and a 9.75" overall length, this HID replacement bulb offers long-lasting durability, dependable output, and reduced maintenance for demanding lighting environments.