400 Watt BT37 E39 4000K Cool White Enclosed Rated 18000 Hours M135 M155 ANSI

The MS400W U BT37 PS 4K is a 400-watt enclosed-rated metal halide lamp offering consistent, high-lumen output with long-lasting performance. Featuring a BT37 bulb shape, E39 mogul base, and cool white 4000K color temperature, this lamp provides bright, efficient lighting with a clear finish. Designed for enclosed fixture use only, it meets ANSI M135/M155 specifications and is ideal for demanding commercial and industrial lighting environments.

Specifications

• Electrical & Performance

  • Wattage: 400W

  • Life Hours: 18000

  • Color Temperature: 4000K Cool White

  • CRI: 70

  • ANSI Code: M135 / M155

  • Start Method: Probe Start

• Physical Characteristics

  • Shape: BT37

  • Base: E39 Mogul

  • Finish: Clear

  • Enclosed Rated: Yes

  • Open Rated: No

  • MOL (Maximum Overall Length): 12.25 in

  • Length: 11.31 in / 287.27 mm

  • Diameter: 4.65 in / 118.11 mm

• Packaging

  • Package Quantity: 1 Lamp

  • Case Quantity: 6 Lamps

Applications:
Ideal for enclosed industrial fixtures, warehouses, gymnasiums, and outdoor commercial lighting requiring high lumen performance and reliable long-term use. Not for use in open fixtures.