SYLVANIA H33 | 400W Coated ED37 Mercury Vapor Lamp

The Sylvania 400W Mercury Vapor Lamp (H33 Code) is a commercial and industrial-grade High-Intensity Discharge (HID) lighting solution engineered for high-ceiling and demanding environments. Featuring a classic, durable **coated ED37 elliptical bulb design**, this high-performance lamp ensures optimized, diffused light distribution while reducing glare. Built to operate on standard **H33 ballasts**, it delivers an impressive **23,000 initial lumens** of crisp **4000K Cool White** illumination. Outfitted with a standard **E39 Mogul Screw base** and a heavy-duty inner arc tube structure, this universal-burn lamp yields a long, reliable rated life of up to **24,000 hours**, drastically minimizing industrial facility relamping and maintenance cycles.

Universal Burn Position and Industrial Grade Design

Sylvania Mercury Vapor high-intensity discharge lamps incorporate heavy-duty arc structures and specialized thermal engineering that drastically slow down lumen depreciation over time. Maintaining a solid **16,200 mean lumens** measured at 50% of its runtime, this configuration provides continuous structural radiance for warehouses, factories, and outdoor areas. Its **Universal operating burn position** allows for complete installation flexibility without compromising lamp longevity or structural integrity, serving as a versatile high-output choice for high-bay commercial frameworks.

• Extended Maintenance Longevity: Engineered to yield a long-term operational service range up to **24,000 hours**, reducing replacement overhead and physical maintenance logistics in hard-to-reach commercial areas.
• Diffused Coated Optics: Manufactured with an advanced internal glass coating that optimally diffuses the intense internal mercury arc, providing uniform light distribution across wide indoor layouts.
• Flexible Universal Operation: Programmed to operate efficiently in any orientation (vertical, horizontal, or angled), giving facility managers total configuration freedom.
• High-Temperature Durability: Structural layout built to withstand high internal thermal loads, maintaining nominal operating stability with a high temperature resistance threshold up to 752°F (400°C) at the glass envelope.

Technical Specifications

• Brand: Sylvania
• Technology Type: High-Intensity Discharge (HID) Mercury Vapor
• Wattage: 400W
• Bulb Configuration: ED37 (Elliptical Coated, 4.5" Outer Diameter)
• Base Type: E39 (Mogul Screw Base)
• ANSI Ballast Code: H33
• Fixture Requirement: O-Type (Open or Enclosed Rated Fixture)
• Operating Burn Position: Universal (Flexible Installation)
• Initial Lumens: 23,000 lm (Evaluated after 100 benchmark hours)
• Mean Lumens: 16,200 lm (Evaluated at 50% of rated life)
• Color Temperature: 4000K (Cool White Spectrum)
• Color Rendering Index (CRI): 43
• Average Rated Lifespan: 24,000 Hours
• Maximum Overall Length (MOL): 11.5 Inches
• Lumen Directionality: Horizontal lumen values are typically 5-10% lower than vertical values.

Ballast Operation & System Integration Guidelines

• Ballast Compliance: This mercury vapor lamp must be run exclusively on compatible electrical systems and high-intensity discharge ballasts designed to comply with ANSI Code H33 operation.
• Warm-up Profile: Reaches its nominal stabilization threshold and full brightness within a maximum warm-up time of 15 minutes from initial cold start.
• Hot Restrike Capability: Following a sudden voltage drop or power interruption, the lamp requires a cooling period between 3 to 9 minutes to achieve a successful hot restrike and relight.
• Thermal management: Ensure proper ventilation inside fixtures. The system is rated for a maximum base terminal threshold of 374°F (190°C) and a max outer bulb temperature of 752°F (400°C).

Safety and Handling Protocols

Important Technical Note: This HID mercury vapor lamp must be installed by qualified electrical professionals in compliance with local safety codes. Always ensure power supplies are fully disconnected before maintenance cycles. Standard mercury lamps must be matched to correct enclosed or open-rated (O-Type) housings to shield against high operational temperatures and ensure optimal workplace safety.

Recommended Commercial Applications

• Industrial Warehouses & Manufacturing: Perfect for overhead high-bay environments requiring robust, long-lasting wide-area ambient light.
• Outdoor Floodlighting & Security: Ideal for perimeter streetways, commercial parking structural fixtures, and industrial yard enclosures.
• High-Ceiling Public Architecture: Well-suited for gymnasiums, sports complexes, and transit terminals engineered around legacy mogul-base fixtures.