Product Overview

Sylvania Dulux S/E ECOLOGIC P/N #20257 (CF9DS/E/827) Compact Fluorescent Lamp — 9W | 2700K Warm White | 600 Lumens | 2G7 4-Pin Plug base

The Sylvania Dulux® S/E ECOLOGIC® 20257 (CF9DS/E/827) Lamp is a commercial-grade, high-efficiency single-tube compact fluorescent lamp (CFL) engineered for low-profile corridor wall sconces, shallow recessed ceiling downlights, surface-mount safety luminaires, and specialized low-wattage task hospitality fixtures. Delivering 600 initial lumens of soft, comfortable 2700K warm white illumination, this premium 9-watt plug-in bulb utilizes a rare-earth tri-phosphor coating to achieve an excellent color rendering index of 82 CRI. Outfitted with an industry-standard 2G7 4-pin electronic base and structured with a low mercury fill weight, it provides a dependable 10,000-hour rated average service life when driven by certified electronic ballast circuits.

Wattage

Single Tube CFL

Brightness

600 lm

82 CRI Accuracy

Color Temp

2700K

827 Warm White

Base Style

2G7

4-Pin Plug-In

Service Life

10,000 Hr

Electronic Only

ADL Supply Expert Application & Replacement Guide

The Sylvania Dulux® S/E 20257 compact single-tube lamp is an established commercial and hospitality infrastructure baseline specified universally across hotel guestroom sconces, multi-family common area downlights, commercial stairwell safety fixtures, and localized aesthetic task panels. Delivering a soft 2700K color temp profile, this warm white emission matches traditional incandescent illumination curves, throwing cozy, inviting visual field washes across public lobbies and pathways while maximizing overall building energy efficiency targets.

Critical Programmed-Start Electronic Ballast Requirements and Shunted Socket Boundaries: Licensed electrical contractors and facility maintenance crews executing routine re-lamping sweeps must observe clear electrical constraints prior to checkout: this 4-pin 2G7 single-tube plug-in lamp is not self-ballasted and requires a compatible external 9W high-frequency electronic ballast circuit to operate safely. It is completely incompatible with legacy 2-pin magnetic ballasts (designed for Dulux S plug bases) and will fail to ignite if cross-wired onto magnetic lines.

Modern electronic ballasts require shunted lampholders where both socket pins connect to form a preheat circuit loop layout. The programmed starting sequence pre-heats the internal tungsten cathodes for roughly one second prior to full arc strike, minimizing micro-tungsten sputtering and preserving emission coatings to secure the lamp's full 10,000-hour rated lifespan. Ensure the prongs are fully aligned and clicked home vertically inside the socket base. Sidelined or loose contacts will invite localized tracking arcing, leading to melted base housings.

Verify Before Installing

9W Electronic Ballast Required — 2G7 4-Pin Sockets Checked — Regional Shipping Restrictions

This bulb features a compact single-folded tube layout measuring exactly 5.7" Inches (144.8mm) in Maximum Overall Length (MOL) with a standard T4 profile diameter—verify your sconce physical clear dimensions exactly before ordering. Always ensure your host electronic ballasts incorporate an integrated end-of-life (EOL) sensing shutdown protection track per NEMA guidelines to prevent base area overheating or melting during terminal degradation phases. Never touch the glass tube with wet or oily hands.

State Delivery Restrictions: Due to strict regional environmental laws and mercury content caps, this traditional fluorescent discharge tube cannot be legally sold or shipped to residential or commercial destinations inside CA, CO, HI, ME, MN, OR, RI, or VT.

Detailed Product Specifications

Brand Name: Sylvania (OSRAM Sylvania Product Portfolio / ECOLOGIC® Commercial Series)
Product Series Line: Dulux® S/E Single-Tube Compact Fluorescent Family
Sylvania Factory Product Order Code SKU: 20257 (Corrected unified inventory catalog key)
Manufacturer Description Model Nomenclature: CF9DS/E/827
NEMA Generic Product Specification Code: CFT9W/2G7/827
UPC Barcode Number (GTIN-12): 046135202575
Global Trade Logistics Code (GTIN-13): 0046135202575
Core Technology Class: Low-Pressure Gaseous Discharge — Compact Fluorescent (T4 Single-Tube U-Shape Geometry)
Ignition Starting Method Classification: Programmed Rapid Start Only (Electronic Ballast Controlled)
Primary Control Requirement: External 9W Electronic 4-Pin Ballast Outfitted with EOL Shutdown Protection
Operational Lamp Power Draw: 9 Watts
Initial Luminous Brightness: 600 Lumens (Post standard 100-hour laboratory seasoning burn)
Systemic Luminous Efficacy: 66.6 Lumens per Watt (LPW)
Color Temperature Configuration: 2700K Warm White (827 Rare-Earth Fluorescent Phosphor Blend)
Color Rendering Index (CRI): 82 Ra (High Commercial Task Visibility Accuracy Profile)
Base Type Configuration: 2G7 (Single-Ended 4-Pin inline plug base format)
Maximum Overall Length (MOL): 5.7" Inches (144.8mm total structural height face-to-tip)
Nominal Bulb Profile Diameter: T4 Shape Casing Profile (12.0mm actual glass cylinder width)
Rated Average Service Lifespan: 10,000 Hours (Based on standard 3-hour industrial cycling shifts)
Chassis Burn Position Limit: Universal — Operates reliably at any horizontal, vertical, or tilted angle
Environmental Assessment Rating: Ecologic® Brand Standard — EPA TCLP Compliant for reduced waste leaching
Mercury Content Weight Dose: 2.5 mg Total Mercury Fill Weight (Requires certified e-waste commercial recycling)

Operation, Safety & Mounting Compliance

High-Frequency Solid-State Low-Flicker Current Damping

When retrofitted onto approved high-efficiency electronic ballasts, this lamp processes power over precise high-frequency square waves, completely eliminating the visual strobe flicker and loud hum characteristic of vintage magnetic circuits. This solid-state control matrix maintains uniform mercury vapor distribution paths within the glass casing, ensuring stable lumen delivery without causing localized overheating near the terminal base pins throughout extended commercial operations.

Commercial Equipment Industry Cross-References

This premium 9W 2G7 single-tube compact fluorescent lamp serves as a direct drop-in replacement or alternative for the following lines:

GE Lighting Alternative: F9BX/827/4P Biax S/E Series / Product Catalog Code 11912
Philips Lighting Match: PL-S 9W/827/4P MasterColor Single-Ended Line / USA Product Code 146837
Osram Reference Line: Dulux S/E 9W/827 WDL High Efficacy 4-Pin Technical Replacement
Related Sylvania Structural SKU: CFT5W/2G7/841 — 5W 4100K cool white variant of this Dulux S/E 2G7 platform

Bulk Commercial Lighting Supply & Project Support

ADL Supply delivers commercial-volume logistical fulfillment, tiered commercial contractor discounting strategies, and full pallet project quoting options to electrical accounts across the United States.

For formal wholesale inquiries, volume pricing modifications, or manufacturer spec sheet documentation, reach our commercial branch directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.