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Sylvania 21879 Octron 800 Curvalume T8 U-Tube Fluorescent Lamp, 31W
The Sylvania 21879 is a T8 U-Tube fluorescent lamp from the Octron® 800 Curvalume® series, engineered for reliable general-purpose lighting in commercial and institutional spaces. This 31-Watt lamp features a 2-Pin Medium base, delivers 2725 lumens at 82 CRI, and produces a 4100K color temperature for crisp, neutral-white illumination. Measuring 22-1/2 inches in length, this U-tube configuration is a direct fit for fixtures designed around the Octron 800 Curvalume platform, making it a straightforward replacement lamp for troffers and similar fluorescent fixtures.
Key Features
- Lamp Length: 22-1/2 inches, sized for U-tube fixture applications using the Curvalume form factor.
- Wattage: 31-Watt fluorescent lamp for efficient general illumination.
- Light Output: 2725 lumens at 82 CRI, delivering accurate color rendering for everyday commercial lighting needs.
- Color Temperature: 4100K neutral-white light, suited to office, retail, and institutional environments.
- Base Type: 2-Pin Medium base for compatibility with standard U-tube fluorescent fixtures.
- Lamp Type: T8 U-Tube fluorescent design from the Octron® 800 Curvalume® product family.
Technical Specifications
- Product Type: Fluorescent Lamp
- Lamp Style: T8 U-Tube
- Wattage: 31-Watt
- Base: 2-Pin Medium
- Lumens: 2725
- CRI: 82
- Color Temperature: 4100K
- Length: 22-1/2 Inch
- Series: Octron® 800 Curvalume®
Typical Applications
- Commercial Office and Retail Lighting
- Fluorescent Troffer and U-Tube Fixture Retrofits
- Institutional and Educational Facility Lighting
- General-Purpose Interior Illumination
Why Sylvania?
Sylvania's Octron® 800 Curvalume® series is built to deliver consistent, high-quality light output with accurate 82 CRI color rendering and a reliable 4100K color temperature. Choosing the Sylvania 21879 U-tube fluorescent lamp gives professionals a dependable, direct-fit replacement for existing fixtures designed around this proven lamp platform.
Manufacturer Resources
Product Specs
- list_batch:
- SYL-20260928
- Product Type:
- Fluorescent Lamp
- Product Wattage:
- 31W
- Light Temperature:
- 4100K
- Lumens:
- 2725
- CRI:
- 82
- Bulb Base:
- 2-Pin Medium
- Series:
- Octron 800 Curvalume
- Department:
- Electrical
- Product Group:
- Lighting
- Product Subgroup:
- Lamps & Ballasts
Sylvania 21879 – Frequently Asked Questions
1) Will the Sylvania 21879 U-tube lamp fit my existing 2x2 troffer?
The 21879 is a T8 U-tube with a 2-pin medium base and an overall length of 22-1/2 inches, which is the standard Curvalume form factor used in 2x2 troffers and similar U-tube fixtures. If your fixture already takes a 22-1/2 inch T8 U-bend on medium bi-pin sockets, this drops straight in. Fixtures built around shorter U-tubes or 4-foot straight T8 lamps are a different lamp entirely.
2) Can I use the 31W 21879 to replace a 32W U-tube and cut wattage?
The 21879 is the 31-watt energy-saving U-bend in the Octron 800 Curvalume family, same 22-1/2 inch length and 2-pin medium base as a standard 32W U-tube, so it is a lamp-for-lamp swap on fixtures built for that form factor. Before standardizing a building on it, confirm your ballast is rated to drive the 31W lamp; some older ballasts are dedicated to 32W only.
3) What ballast does a 31W T8 U-tube like the Sylvania 21879 need?
It is a 31-watt T8 U-bend lamp on a 2-pin medium base, so it runs on a rapid-start or instant-start T8 fluorescent ballast rated for the lamp. The 2-pin base means the lamp has no internal starter, so the ballast handles starting. It will not operate on a direct-wire LED retrofit circuit, and it is not a substitute for a 32W 4-foot straight T8 on its own fixture count unless the ballast is rated for U-bend operation.
4) Is 4100K the right color for an office, or should I go warmer or cooler?
4100K is neutral white, the common choice for offices, classrooms, retail and corridors because it reads clean without going blue. If you are matching existing lamps in a building, check what is already installed: mixing 4100K with 3500K or 5000K tubes in the same room is immediately visible across a ceiling grid. The 21879 is the 4100K version at 82 CRI.
5) What part number do I order for the Sylvania 4100K 31W T8 U-tube?
Order Sylvania 21879. That is the manufacturer part number for the 31W, 4100K, 82 CRI T8 U-bend in the Octron 800 Curvalume line. Sylvania builds this U-bend in other color temperatures too, so quoting the 21879 number is what keeps 4100K lamps arriving instead of 3500K or 5000K.
6) How much light does the Sylvania 21879 put out?
2725 lumens from 31 watts, at 82 CRI. In a two-lamp 2x2 troffer that is roughly 5,450 lumens of lamp output before fixture losses, which is why these are usually spec'd two or three per fixture in general office lighting. The 82 CRI is good enough for accurate color on finishes and signage in retail space.
7) Is this U-tube lamp suitable for a school or hospital corridor retrofit?
Yes, it is a general-purpose commercial and institutional lamp: 31W T8 U-bend, 4100K, 2725 lumens, 82 CRI, used in troffers in offices, retail, schools and similar interiors. For large facility orders the thing to lock down is color temperature consistency across all the ceiling fixtures, since a mixed-Kelvin corridor is the most common complaint after a partial relamp.
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Does the Sylvania 21879 come with a warranty?
Absolutely. The Sylvania 21879 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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