Sylvania 21879 FBO31/841 Octron Curvalume – 31W | T8 U-Bend | 4100K Cool White | G13 Base

The Sylvania 21879 (FBO31/841) is a specialized 31-watt T8 U-bend fluorescent lamp from the Octron® Curvalume® series. Designed for 2x2 compact commercial troffers, it delivers 2,725 lumens of crisp 4100K cool white light. Engineered for high performance in offices, schools, and retail spaces, this lamp features an 82 CRI for accurate color representation and is compatible with both electronic and magnetic rapid-start ballasts. UPC: 046135218798.

Quick Specs

• Brand: Sylvania Octron Curvalume
• Order Code: 21879 (FBO31/841)
• Wattage: 31W
• Brightness: 2,725 Initial Lumens / 2,560 Mean Lumens
• Color Temp: 4100K Cool White
• CRI: 82
• Dimensions: 22.6" MOL (Length) | 1.625" Leg Spacing (U6)
• Base Type: G13 Medium Bi-Pin
• Ballast Type: Rapid Start or Instant Start Electronic T8
• Lifespan: 20,000 to 28,000 hours (depending on start cycle)

Technology Comparison: Fluorescent vs. LED Retrofit

While the 21879 remains a reliable choice for existing ballasts, many facilities are transitioning to LED for lower energy costs and zero maintenance.

Performance & Installation Notes

• Cold Temperature Performance: Rated for operation down to 0°F (-18°C) with appropriate ballasts.
• Maintenance: Mean lumens are calculated at 40% of rated life; expect roughly 94% lumen maintenance.
• Fixture Compatibility: Specifically designed for 2x2 ceiling troffers and retail display cases.
• Warranty: Covered by Sylvania's Quick 60+ system warranty when used with Sylvania Quicktronic ballasts.

Ordering Information

• Sylvania Part Number: 21879
• UPC: 046135218798
• Case Quantity: 15 Lamps per Case
• Alternate Colors: Also available in 3000K (21877), 3500K (21878), and 5000K (21881).

ADL Supply recommends verifying your ballast factor (0.71 – 1.20) for optimal lamp life and energy savings.