400 Watt BT28 E39 Base 4000K Cool White Clear Finish 18000 Hours – Not Open or Enclosed Rated

The MS400W U BT28 PS 4K CLEAR is a 400-watt metal halide lamp with a BT28 bulb shape and E39 mogul base, providing a cool white 4000K color temperature and clear finish for bright, efficient illumination. Rated for 18000 hours of life, it meets ANSI M135/M155 specifications and is suitable for specific enclosed fixture applications where rating is not critical. Note: This lamp is not open or enclosed fixture rated.

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: BT28

  • Base: E39 Mogul

  • Finish: Clear

  • Open Rated: No

  • Enclosed Rated: No

  • MOL (Maximum Overall Length): 9.25 in

  • Length: 8.2 in / 208.28 mm

  • Diameter: 3.59 in / 91.19 mm

• Packaging

  • Package Quantity: 1 Lamp

  • Case Quantity: 12 Lamps

Applications:
Used in controlled environments or fixture-specific applications where open/enclosed ratings are not required. Ideal for maintenance replacements in compatible industrial and commercial fixtures. Always verify fixture compatibility