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Sylvania 20721 CF13DD 13W Fluorescent Lamp 10-Pack — main product image
Sylvania

Sylvania 20721 CF13DD 13W Fluorescent Lamp 10-Pack

★★★★★4.6 (28 reviews)
13W

Warm, energy-efficient 13W compact fluorescent lamps in a convenient 10-pack with 12,000-hour rated life.

$28.99*
✓ In Stock on Amazon.com
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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 20721 CF13DD/E/830/ECO is a double-tube compact fluorescent lamp rated at 13 watts and delivering 900 lumens of warm 3000K light. Designed for use with electronic and dimming ballasts, it fits fixtures equipped with a G24q-1 four-pin base — a common configuration in commercial downlights, wall sconces, and recessed fixtures. The 12,000-hour rated life means fewer lamp changes over time, making this 10-pack a practical choice for maintaining larger installations.

As a compact fluorescent, the CF13DD offers significantly better energy efficiency than incandescent equivalents while providing a familiar warm white tone. The ECO designation indicates compliance with reduced mercury content standards. While LED alternatives are increasingly available for this socket type, the CF13DD remains a straightforward drop-in replacement for existing ballast-driven fixtures where switching to LED would require retrofitting or fixture replacement.

Key Features

EFFICIENT LIGHT YOU CAN COUNT ON: This 13W 4-pin compact fluorescent bulb is dimmable and designed for electronic ballast fixtures. Plug-in G24q-1 base. A direct upgrade for recessed, task, and showcase lighting.

CRISP, HIGH-QUALITY LIGHT WITH 82 CRI: Rare earth phosphors deliver accurate, natural-looking color in a white 3000K tone. High CRI means colors and surfaces look true - great for retail, task, and accent lighting where light quality matters.

20,000 HOUR LIFE - HALF THE MAINTENANCE: Lasts up to 20 times longer than a standard incandescent bulb and twice as long as many standard CFLs. With 86% mean lumen output maintained, brightness stays consistent well into the lamp's lifespan.

UP TO 75% ENERGY SAVINGS VS. INCANDESCENT: At just 13W, this 4-pin CFL bulb uses about a quarter of the energy of a comparable incandescent. Pair with an electronic dimming ballast to push savings even further when full brightness isn't needed.

DIMMABLE CFL BUILT FOR DEMANDING APPLICATIONS: Ideal for recessed downlights, showcase lighting, exit signs, offices, boardrooms, classrooms and hotel lobbies. A reliable 4-pin light bulb built to provide long-lasting, controllable light.

Specifications

Wattage
13W
Lumens
900
Color Temperature
3000K (Warm White)
Base Type
G24q-1 (4-Pin)
Lamp Shape
Double Tube (DD)
Rated Life
12,000 Hours
Ballast Compatibility
Electronic and Dimming
Quantity
10-Pack
Model
20721 / CF13DD/E/830/ECO

Pros & Cons

👍 Pros

  • 10-pack offers good value for bulk replacement needs
  • 900 lumens from only 13 watts provides strong energy efficiency
  • 12,000-hour rated life reduces frequency of replacements
  • 3000K warm white color temperature suits most commercial and residential settings
  • Compatible with both electronic and dimming ballasts for flexible installation

👎 Cons

  • G24q-1 4-pin base limits compatibility to specific fixtures only
  • Requires a separate compatible ballast to operate
  • Compact fluorescent technology is being phased out in favor of LED alternatives
  • Contains mercury, requiring proper disposal per local regulations
  • Not suitable for enclosed fixtures without adequate ventilation

Frequently Asked Questions

This lamp is designed for use with electronic and dimming ballasts. It is not compatible with magnetic ballasts.
No. The CF13DD uses a G24q-1 4-pin base, which requires a compatible pin-base fixture or socket. It will not fit standard Edison screw sockets.
It produces a warm white light at 3000K, similar in tone to traditional incandescent lighting.
This is a 10-pack, so you receive 10 individual CF13DD lamps.
Yes, when paired with a compatible dimming ballast, these lamps support dimming operation.

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