Damar 25311A MP400W/BU/UVP/4K 400W Metal Halide BT37 Open Rated 4000K EX39 Base

Identification & Application

The Damar 25311A is a 400W metal halide lamp specified as MP400W/BU/UVP/4K in a BT37 bulb configuration with a 4000K color temperature and EX39 mogul base. It is designed for use in high intensity discharge luminaires rated for 400W metal halide operation. This lamp requires a compatible metal halide ballast as specified by the fixture manufacturer. It features ultraviolet prevention (UVP) and is intended for high bay, area, and industrial lighting applications requiring neutral white output in open rated fixtures. Verify ballast compatibility, fixture rating, and operating position before installation.

Technical Performance Specifications

• Brand: Damar
• SKU: 25311A
• MPN: MP400W/BU/UVP/4K
• Product Type: Metal Halide Lamp
• Installation Type: Screw-in lamp for HID luminaires with EX39 mogul sockets
• Electrical: 400W, requires compatible metal halide ballast
• Optical: 4000K, Typical (not manufacturer documented): 32000-40000 lm
• Base Type: EX39 Mogul
• Mechanical: BT37 bulb shape, universal burn position (BU), ultraviolet prevention (UVP)
• Lifecycle: average life 20,000 hr
• Documentation: See manufacturer spec sheet for additional details

Application Guidance

Use in open rated luminaires designed for 400W metal halide lamps with EX39 mogul sockets. Ensure the ballast type matches the MP400W/BU/UVP/4K electrical requirements before installation. De-energize the circuit and allow the existing lamp to cool prior to replacement. Install by threading the base securely into the socket without over-tightening. Follow applicable safety and disposal regulations for HID lamps.