Sylvania 21878 FBO31/835 T8 U-Tube Fluorescent Lamp, 31W, 3500K

Sylvania 21878 FBO31/835 T8 U-Tube Fluorescent Lamp, 31W, 3500K

The Sylvania 21878 FBO31/835 is a T8 U-Tube fluorescent lamp built on Sylvania's Octron® Curvalume® platform, delivering a 31-Watt output with 2725 lumens and a warm-neutral 3500K color temperature. This U-bent lamp design uses a 2-Pin Medium Base and measures 22-1/2 inches in length, making it a compact-format replacement for troffer and recessed fixtures where a straight T8 tube will not fit. With an 82 CRI rating, the 21878 renders colors accurately for general commercial lighting applications, offering reliable, consistent illumination for facilities that rely on U-tube fluorescent fixtures.

Key Features

• Lamp Type: T8 U-Tube fluorescent construction from the Octron® Curvalume® series, engineered as a compact bent-tube alternative to straight T8 lamps.
• Wattage: 31-Watt lamp providing efficient light output for general-purpose commercial fixtures.
• Light Output: 2725 lumens with a 3500K color temperature for a balanced, warm-neutral white light suited to offices, retail, and institutional spaces.
• Color Rendering: 82 CRI delivers accurate, natural color rendering for tasks that require good visual clarity.
• Base Type: 2-Pin Medium Base designed for compatibility with U-tube fluorescent sockets and fixtures.
• Length: 22-1/2-inch overall length, sized for U-bend fixture cavities where standard 4-foot straight lamps cannot be installed.

Technical Specifications

• Lamp Type: T8 U-Tube Fluorescent
• Wattage: 31-Watt
• Lumens: 2725
• CRI: 82
• Color Temperature: 3500K
• Base: 2-Pin Medium Base
• Length: 22-1/2 Inch
• Series: Octron® Curvalume®

Typical Applications

• Recessed Troffer and Compact Fixture Lighting
• Commercial Office and Retail Lighting
• Institutional and Educational Facility Lighting
• Replacement Lamp for Existing U-Tube Fluorescent Fixtures
• General-Purpose Interior Ambient Lighting

Why Sylvania?

Sylvania's Octron® Curvalume® U-tube fluorescent lamps are engineered to deliver dependable light output, accurate color rendering at 82 CRI, and a compact form factor suited to fixtures that can't accommodate a standard straight tube. The 21878 FBO31/835 combines a 31-Watt rating with 2725 lumens and 3500K color temperature, giving facility managers a consistent, code-compliant replacement lamp for commercial and institutional U-tube fixtures.