SYLVANIA 21137 | CF13DS835ECO 13W Dulux® S T4 Compact Fluorescent Lamp

The Sylvania 21137 (CF13DS835ECO) is a high-efficiency Dulux® S plug-in compact fluorescent lamp designed to deliver energy savings and crisp illumination. Consuming only 13 Watts, this T4 single-tube lamp produces 720 initial lumens of a balanced 3500K Natural White light. Built with a standard GX23 2-pin base that features an integrated internal starter, it is engineered exclusively for use on traditional magnetic ballast setups. This ecologically minded **ECOLOGIC®** lamp replaces the legacy Sylvania 20335 model, providing an excellent color rendering index (CRI) of 82 over a **10,000-hour** operational life.

Sustainable Lighting Benefits

Part of the Sylvania ECOLOGIC® line, the **CF13DS835ECO** is meticulously manufactured to pass the Federal **TCLP (Toxicity Characteristic Leaching Procedure)** test, indicating lower heavy-metal content. By reducing overall electrical consumption compared to incandescent bulbs of equivalent light output, this lamp helps drop greenhouse gas and power-generation mercury footprints. Each base contains a built-in preheat ignition starter, drastically simplifying fixture architecture while ensuring smooth lamp ignition under commercial and residential runtimes alike.

• ECOLOGIC® Certified: Passes strict federal TCLP criteria for low-mercury, eco-conscious electronic disposal.
• Integrated Ignition: 2-pin base configuration houses an internal starter capsule for rapid, hassle-free magnetic fixture firing.
• Legacy Replacement: Direct electrical and physical drop-in substitute for the obsolete **Sylvania 20335** item code.
• High Color Quality: Features an 82 CRI value that sharpens ambient textures and avoids a washed-out atmosphere.

Technical Specifications

• Brand: Sylvania
• Ordering Code: 21137
• Abbreviation: CF13DS835ECO
• Series: Dulux® S
• Wattage: 13W
• Lamp Type: Compact Fluorescent (Plug-In)
• Bulb Profile: T4 Single-Tube
• Base Type: GX23 (2-Pin)
• Initial Lumens: 720 lm
• Color Temperature: 3500K (Natural White)
• Color Rendering Index (CRI): 82
• Ballast Requirement: For Use On Magnetic Ballasts Only
• Maximum Overall Length (MOL): 7.1 Inches (180mm)
• Average Rated Life: 10,000 Hours

Common Applications

• Commercial Downlights: Delivers clean, uniform profiles inside recessed commercial corridor canisters.
• Decorative Wall Sconces: Compact T4 geometry easily matches standard hospitality and architectural side-wall sconces.
• Recessed Ceiling Fixtures: Fits comfortably in space-restricted utility drop-ceiling lighting plans.
• Safety Exit Signs: Long-life design limits maintenance overhead across mandatory 24/7 illumination nodes.
• Showcase & Task Lighting: Provides premium rendering lines underneath shelves or focal point counters.