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Sylvania 21115 CF26DD/841/ECO 26W 4100K Compact Fluorescent Lamp (10-Pack) — main product image
Sylvania

Sylvania 21115 CF26DD/841/ECO 26W 4100K Compact Fluorescent Lamp (10-Pack)

★★★★★4.5 (104 reviews)
26W1.59999999865825 lb

A 26W double-tube CFL delivering 4100K cool white at 82 CRI — reliable, efficient workhorse lighting in a 10-pack.

$31.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Sylvania 21115 CF26DD/841/ECO is a 26-watt double-tube compact fluorescent lamp producing light at 4100K — a neutral cool white that reads as clean and professional in office, retail, and institutional environments. At 82 CRI, it renders colors reasonably well for general tasks but lacks the spectral completeness needed for color-critical applications like product photography, video production, or paint matching. The double-tube form factor fits standard recessed and surface-mount downlight fixtures equipped with GX24d-3 (2-pin) sockets running magnetic ballasts. As an ECOLOGIC-designated lamp, it meets TCLP compliance standards for reduced mercury, simplifying disposal logistics for facilities managing large lamp inventories.

This 10-pack is targeted at maintenance and facilities teams managing commercial lighting infrastructure where CFL fixtures are already installed. The economics favor bulk replacement over individual purchases, and the consistent 4100K temperature across units ensures uniform appearance in multi-lamp environments like drop ceilings and troffer arrays. For new installations or retrofits, LED plug-in replacements have largely overtaken CFLs in efficiency and color quality, but the CF26DD remains the correct choice when the goal is maintaining existing magnetic ballast fixtures without rewiring. Output is rated for standard commercial duty cycles, and the U.S.-manufactured lamps carry Sylvania's established reliability in this product category.

Key Features

Country Of Origin: United States

Model Number: 21115

Item Package Dimensions: 8.99999999082" L x 7.399999992452" W x 5.799999994084" H

Item Package Weight: 1.59999999865825 lb

Specifications

Brand
Sylvania
Model
21115
Wattage
26W
Color Temperature
4100K (Cool White)
CRI
82
Lamp Type
Double Tube Compact Fluorescent
Base Type
2-Pin (GX24d-3)
ECOLOGIC
Yes (TCLP Compliant)
Pack Quantity
10
Country of Origin
United States

Pros & Cons

👍 Pros

  • 4100K color temperature delivers neutral cool white light suitable for commercial spaces, task areas, and general overhead fixtures
  • 10-pack quantity reduces per-unit cost and ensures you have replacements on hand for multi-lamp installations
  • TCLP-compliant ECOLOGIC designation means reduced mercury content and simpler disposal requirements than standard CFLs
  • 26W power draw produces strong lumen output relative to wattage, providing meaningful energy savings over incandescent equivalents
  • 2-pin GX24d base ensures simple drop-in compatibility with existing magnetic ballast fixtures

👎 Cons

  • 82 CRI falls short of the 90+ threshold needed for accurate color rendering under camera or in design-critical environments
  • 2-pin magnetic ballast operation does not support dimming, offering zero output control without a fixture swap
  • CFL technology produces measurable flicker at certain frequencies, which can appear on camera at specific shutter speeds and frame rates
  • Warm-up time to full brightness is inherent to compact fluorescent — expect 30-60 seconds to reach rated output after ignition
  • Mercury content, while reduced, still requires responsible recycling and limits this lamp's environmental advantage over LED alternatives

Frequently Asked Questions

4100K places this lamp squarely in the cool white range — neutral with a slight cool bias, comparable to daylight-balanced fluorescent office lighting. The 82 CRI is adequate for general commercial and task lighting but falls below the 90+ CRI threshold preferred for color-critical work like photography or video.
The CF26DD uses a 2-pin (GX24d-3) base, which means it's designed for use with a magnetic ballast. It will not work with electronic ballasts designed for 4-pin compact fluorescent lamps — verify your fixture's pin configuration before purchasing.
A 26W CFL in this configuration typically produces around 1,700-1,800 lumens. A comparable LED plug-in replacement would deliver similar output at roughly 10-12W. If you're replacing multiple lamps, the energy savings from switching to LED equivalents are significant.
No. Two-pin compact fluorescent lamps operating on magnetic ballasts do not support dimming. If you need adjustable output levels, you would need to switch to a dimmable LED replacement or a fixture with a dimmable electronic ballast and compatible 4-pin lamp.
TCLP (Toxicity Characteristic Leaching Procedure) compliance means this lamp passes EPA testing for reduced mercury content, so it can be disposed of in standard waste streams in most jurisdictions. However, recycling is still recommended as best practice for any fluorescent lamp containing mercury.

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