Product Overview
Philips MS400BUED28PS 400W 4000K Pulse Start Metal Halide Lamp
Technical Specifications
- Color Rendering Index: CRI 68
- 20,000-hour Average Rated Lifespan
- E-39 Mogul Screw Base
- ANSI Codes: M155/M128/M135/E
- Dimensions: 8-5/16" MOL x 3.5" Diameter
- Base-Up Burn Position (±15° tolerance)
Key Performance Features
- Enhanced Efficiency: 120 LPW luminous efficacy
- Fast Operation: 50% quicker warm-up/restrike vs standard MH
- Superior Output: 25% higher maintained lumens
- Durable Design: Rated for enclosed fixtures only
Industrial Applications
- High-bay warehouse lighting
- Commercial floodlighting systems
- Industrial facility lighting
- Parking structure illumination
- Stadium and arena lighting
Safety & Compliance
Critical Safety Information:
- UV radiation risk if envelope compromised
- Requires FDA-compliant shielding (21 CFR 1040.30)
- Automatic shut-off models available
- Canada compliant: SOR/DORS/80-381
Must be used in enclosed fixtures with proper UV filtration
Competitive Advantages
- 50% longer lifespan than standard metal halide
- 25% energy savings over switch-start equivalents
- Optimal 4000K cool white color temperature
- Pulse start technology for consistent performance
