Replacement Light Bulb for OSRAM SYLVANIA M400/U/BT28 Industrial Lighting - 400W 4000K E39 Base

Replacement for the OSRAM SYLVANIA M400/U/BT28 in industrial and commercial fixtures that require a 400 watt ED28 mercury lamp. This clear bulb operates at 4000K color temperature to produce 36000 lumens while maintaining a CRI of 65 and a rated life of 20000 hours on an E39 mogul screw base.

Key Features & Benefits

• Delivers 36000 lumens from a 400 watt input at 4000K color temperature
• ED28 shape with clear finish and 20000 hour rated life
• CRI of 65 for consistent light output in commercial settings
• E39 mogul screw base fits fixtures designed for this specification

Product Specifications

• Watts: 400
• Base: E39 MOGUL SCREW BASE 39MM DIAMETER (E40)
• Color Temp: 4000
• Lumens: 36000
• Shape: ED28
• Life: 20000
• CRI: 65
• Bulb Finish: CLEAR

Replacement Compatibility

Compatible with fixtures using OSRAM SYLVANIA M400/U/BT28 and equivalent 400W HID mercury models in industrial and commercial lighting applications.

Discover the Perfect Replacement

Confirm your fixture requires this exact 400W ED28 mercury replacement to restore original lighting performance. Select this bulb for direct compatibility with listed specifications.

During the checkout process, you can choose from expedited services such as overnight delivery to standard ground shipping. We aim to ensure your order is delivered promptly and reliably, wherever you are.

All returns must be made within 30 days of purchase with the invoice. (After 30 days, Interlight credit only, Minimum 25% restocking fee, no returns after 60 days, special items order just for you are not returnable.)

At Interlight, your satisfaction is our priority. We offer a 30-day money-back guarantee on eligible products, provided they are returned in resalable condition with the original invoice.