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Clear glass ED37 metal halide bulb with mogul screw base

Philips

Philips 232835 MS400/U/PS 400W Metal Halide Standard Bulb

SKU CH-0EY9-G0W3B

A 400 watt metal halide bulb delivers 40,000 lumens at 4000K with a 20,000 hour rated life

  • TypeLight Bulbs
  • ColorTransparent
  • 40,000 lumens deliver bright illumination for large spaces
  • 4000K colour temperature provides neutral white light
  • 20,000-hour rated life reduces replacement frequency
  • Universal burning position allows flexible fixture mounting
  • Suitable for enclosed fixtures indoors or outdoors

Philips 400 W Metal Halide ED37

The Philips 232835 MS400/U/PS is a 400 watt metal halide lamp built on an ED37 glass envelope with a mogul screw base. It delivers 40,000 lumens at a 4000 K colour temperature and a colour rendering index of 65. The bulb operates in any burning position and is rated for 20,000 hours of life. It is suitable for both indoor and outdoor fixtures that accept this lamp type.

Check fixture compatibility before ordering

Verify that the fixture uses a mogul screw (E39) socket and is rated for a 400 watt metal halide lamp with ANSI code M155/M135/E. The lamp requires a 150 volt supply and must be installed in an enclosed fixture because it is not shatter-resistant. Confirm the fixture can accommodate the 11 1/2 inch overall length and 4 5/8 inch diameter. Ensure the ballast matches the ANSI code and wattage.

Replaces 400 W metal halide lamps

This lamp directly substitutes existing 400 watt metal halide bulbs that share the M155/M135/E ANSI designation and ED37 form factor. The upgrade is worthwhile when the current lamp has reached the end of its 20,000 hour rated life or when a universal burning position is needed for flexible aiming. It does not serve fixtures requiring a different wattage, base type, or ANSI code.

Highlights

  • 40,000 lumens deliver bright illumination for large spaces
  • 4000K colour temperature provides neutral white light
  • 20,000-hour rated life reduces replacement frequency
  • Universal burning position allows flexible fixture mounting
  • Suitable for enclosed fixtures indoors or outdoors

Specifications

BrandPHILIPS
TypeLight Bulbs
ColorTransparent

Questions about this item

Does the Philips 232835 MS400/U/PS include a ballast or fixture, or is it just the bulb?

The package contains only the 400 W metal halide bulb with a mogul screw E39 base; a compatible ballast and enclosed fixture must be supplied separately.

Should I choose the universal burning version or a position-specific lamp for my installation?

This model is rated for universal burning, so it can operate in any orientation without a separate position-specific variant.

Will the 40,000 lumen output be the same after the lamp has aged in an enclosed fixture?

Initial output is 40,000 lm at 4000 K; lumen maintenance will decline over the 20,000 hour rated life, so design for lower maintained levels.

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