SYLVANIA OCTRON® FBO31/841 T8 U-Bend Fluorescent Lamp – 31W, 4100K Cool White, G13 Bi-Pin

The SYLVANIA 21879 OCTRON® FBO31/841 is a high-performance 31-watt T8 U-bend fluorescent lamp designed for compact commercial fixtures. Delivering 4100K cool white light with strong lumen maintenance, this lamp is ideal for offices, schools, retail, and institutional lighting applications.

Key Specifications

• Manufacturer: SYLVANIA
• Part Number: 21879
• Order Code: FBO31/841
• Lamp Type: T8 U-Bend Fluorescent
• Wattage: 31W
• Color Temperature: 4100K (Cool White)
• CRI: 82
• Initial Lumens (25°C): 2725 lm
• Mean Lumens (25°C): 2560 lm
• Average Rated Life: 15,000 – 28,000 hours*
• Base Type: G13 Medium Bi-Pin
• Dimensions: 22.6 in MOL × 1 in Diameter
• Series: OCTRON® Curvalume

Typical Applications

• Commercial offices and conference rooms
• Schools and educational facilities
• Retail stores and showrooms
• Compact fluorescent U-bend fixtures

Ballast & Installation Notes

• Designed for use with T8 electronic or magnetic rapid-start ballasts rated for 265 mA
• Compatible with instant-start ballasts (ballast factor range 0.71 – 1.20)
• Lamp life ratings are based on 3-hour start cycles; longer cycles may increase life
• Minimum starting temperature and performance depend on ballast and ambient conditions

Performance Notes

Mean lumen values are measured at approximately 40% of rated lamp life. Exposure to drafts or ambient temperatures below 60°F may cause temporary light striations or reduced brightness. These effects are not damaging and will normalize once conditions improve.