Description
Protected Metal Halide Light Bulbs
The Plusrite MP400/BT37/BU/4K is a 400W protected metal halide lamp designed for high-output commercial and industrial lighting in both open and enclosed fixtures. Burning base-up, this BT37 bulb produces a crisp 4200K cool white light and is rated for 10,000 hours of average life, making it a long-lasting solution for warehouses, retail spaces, sports facilities, and high-bay industrial environments. Its M59/O ANSI ballast compatibility and E39 Mogul base provide broad fixture compatibility, while the protected construction ensures safe operation in demanding conditions. Cross-referenced across leading brands for easy sourcing and replacement.





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