Sylvania 20721 CF13DD 13W Fluorescent Lamp 10-Pack

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.