Product Overview
Philips MH400/U (274498) 400W ED37 Clear Metal Halide Lamp — 3900K, E39 Mogul Base, ANSI M59/E
The Philips MH400/U (Item #274498 / 12NC: 928601172301) is a commercial-grade 400W clear ED37 metal halide lamp engineered for high-output industrial, commercial, and outdoor lighting applications. Delivering 39,000 initial lumens (98 lm/W efficacy) of 3900K cool white light with a 65 CRI rating, this switch-start HID lamp features a heavy-duty brass E39 mogul base and a hard glass outer envelope. Compliant with ANSI M59/E ballast standards, it is rated for open or enclosed fixtures in universal burn orientations. Always verify ballast ANSI code, fixture rating, operating position, and voltage before ordering.
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WATTAGE
400W
98 lm/W Efficacy
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LUMENS
39,000 lm
25,350 Mean lm
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COLOR TEMP
3900K
Cool White (65 CRI)
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ANSI / BASE
M59/E
E39 Mogul Screw
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RATED LIFE
20,000 hrs
Universal Burn
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Technical Specifications
| Brand | Philips Lighting / Signify |
| Product / Item Number | 274498 |
| Material Number (12NC) | 928601172301 |
| Order Code / Part Name | MH400/U 6PK |
| Lamp Type / Technology | Switch Start Metal Halide Standard (HID) |
| Bulb Shape | ED37 |
| Bulb Finish / Material | Clear Hard Glass |
| Base Type | E39 Single Contact Mogul Screw (Brass Cap) |
| Wattage | 400 W |
| ANSI Ballast Code | M59/E (Open or Enclosed Fixture Rated) |
| Operating Voltage | 135 V (Nominal, 120V–150V Range) |
| Lamp Operating Current | 3.25 A |
| Initial Lumens | 39,000 lm (34,000 lm Minimum) |
| Design Mean Lumens | 25,350 lm (65% Lumen Maintenance at 40% Life) |
| Efficacy | 98 lm/W (85 lm/W Minimum) |
| Color Temperature (CCT) | 3900 K (Cool White) |
| Color Rendering Index (CRI) | 65 |
| Maximum Overall Length (MOL) | 11.5 in (292.1 mm) |
| Bulb Diameter | 4.625 in (117.5 mm) |
| Operating Position | Universal (Vertical to Horizontal) |
| Rated Operating Life | 20,000 Hours (Vertical +/-15°; non-vertical positions 15,000 Hours / 75% of vertical life) |
| Maximum Bulb Temperature | 400°C |
| Maximum Cap-Base Temperature | 210°C |
| Mercury Content | 38.0 mg (1026 pg/lm h) |
| Packaging Info | 6 per Outer Box (Master Carton) |
| UPC / EAN Code | 046677274498 |
Product Overview
The Philips MH400/U (Item #274498) is a 400-watt switch-start metal halide lamp engineered for high-bay commercial, industrial, and outdoor floodlighting applications. Built with a clear ED37 hard glass envelope and a nickel-plated brass E39 mogul screw base, this lamp provides robust electrical conductivity, vibration resistance, and extended thermal durability in high-intensity lighting environments.
Delivering 39,000 initial lumens at 98 lm/W efficacy, the MH400/U produces a bright 3900K cool white light with a 65 CRI rating. Its universal operating position allows installation across any mounting orientation—from vertical downlights to horizontal security floodlights. Design mean lumens are rated at 25,350 lm, maintaining 65% of original light output through 40% of rated operating life.
Rated for up to 20,000 hours of service when burned vertically (15,000 hours in non-vertical positions), this lamp operates on standard ANSI M59 magnetic ballasts. The M59/E ANSI rating permits operation in both open and enclosed luminaires where suitable safety shielding is present.
Compatible Applications
- Industrial manufacturing plants, machine shops, and warehouse high-bay luminaires
- Distribution centers, logistics hubs, and commercial storage facilities
- Outdoor security lighting, parking lot poles, and perimeter wall packs
- Gymnasiums, field houses, and high-ceiling athletic facilities
Before Ordering – Verify
- ANSI Ballast Code: Requires an ANSI M59 compliant metal halide ballast (operating voltage 135V nominal, 3.25A lamp current). Will not operate on pulse-start M135 or M155 ballasts.
- ANSI Fixture Rating (/E vs /S): This lamp is rated ANSI M59/E, allowing operation in open or enclosed luminaires. Verify fixture enclosure requirements.
- Base Type & Dimensions: Confirm socket compatibility for an E39 Mogul Screw base. Verify physical clearance for ED37 bulb size (11.5 in MOL, 4.625 in diameter).
- Rated Life Orientation Shift: 20,000-hour life rating applies when burned within vertical +/-15 degrees. Horizontal or off-vertical mounting reduces life expectation to 75% (15,000 hours) and initial lumen output by 6% to 10%.
Safety and Handling Guidelines
- Ultraviolet Radiation Hazard: Outer envelope breakage exposes individuals to intense UV radiation, which can cause severe skin burns and eye inflammation. Discontinue operation immediately if the outer glass bulb is cracked, broken, or punctured.
- Mercury Notice: Contains 38 mg of mercury. Manage and dispose of according to local, state, and federal hazardous waste laws (visit www.lamprecycle.org).
- Thermal Handling: Outer bulb operates at temperatures up to 400°C. Always turn off power and allow lamp to cool completely before touching or relamping.
- Electrical Safety: Ensure main power is shut off at the breaker prior to installation or maintenance.
Compliance
- FDA Standard: Complies with FDA radiation performance standard 21 CFR subchapter J (21 CFR 1040.30 in USA / SOR/DORS/80-381 in Canada).
- ANSI Rating: ANSI M59/E compliant.
- Environmental: Contains mercury; TCLP hazardous disposal guidelines apply.
Ordering Information
- Order Product Name: MH400/U 6PK
- Item / Order Code: 274498
- Material Number (12NC): 928601172301
- Brand: Philips Lighting / Signify
- UPC Code: 046677274498
- Packaging: Sold individually; master case contains 6 lamps.
For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.
