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LEGACY REFERENCE

SYLVANIA CF7DS/841/ECO

Identification

G23
Wattage7W
Pins2
Color code841
Color temp4100K
Initial lumens400
Order code21274

Same-spec cross references

These share base, wattage and color temperature. Verify fixture and ballast compatibility before substituting.

Philips PL-S 7W/841G23 · 148734

DETAILED REFERENCE

How to identify and replace SYLVANIA CF7DS/841/ECO

This page documents the SYLVANIA CF7DS/841/ECO, a 7W DULUX S ECOLOGIC lamp using a 2-pin G23 base. The catalog record identifies color code 841 (4,100 K in this catalog record) and 400 initial lumens. Manufacturer order code 21274 provides another high-value identifier when it is present on the lamp or packaging.

For a replacement decision, use the complete combination of markings rather than one feature. A lamp with the same base can still differ in wattage, keying, color, pin configuration, ballast requirements, or other electrical characteristics.

MANUFACTURER FAMILY NOTES

SYLVANIA DULUX S ECOLOGIC family guidance

These are family-level notes from the manufacturer source. They add operating context for CF7DS/841/ECO, but they do not turn another lamp in the same family into an automatic substitute.

  • LEDVANCE documents DULUX S ECOLOGIC as a two-pin compact fluorescent family with an integral starter.
  • The manufacturer specifies these as preheat lamps designed for magnetic ballast operation and lists a 10,000-hour average rated life for the family.
  • Listed applications include downlights, exit signs, surface-mounted fixtures, task lighting and wall sconces.

Manufacturer source: LEDVANCE — DULUX S ECOLOGIC Compact Fluorescent Lamps

Identification checklist

  1. Read the full lamp marking.Look for CF7DS/841/ECO and order code 21274 rather than relying only on the shape.
  2. Confirm the base and pins.This record uses 2-pin G23. A similar-looking keyed base or a different pin count should be treated as a different lamp until verified.
  3. Match wattage and color identity.Reference values here are 7W and color code 841. Color codes that look similar can identify different variants.
  4. Check the fixture electronics.Verify ballast/control gear, supply voltage, socket keying, and manufacturer instructions before installing a fluorescent substitute or LED retrofit.

Search names and aliases

Older lamps are often listed under shortened model strings, base-first descriptions, or manufacturer order codes. These are the aliases currently indexed for this record.

CF7DS/841/ECOCFT7W/G23/8417W G23G23 7W21274

Before buying a replacement

  • Match the exact G23 base and 2-pin configuration.
  • Confirm the original 7W rating and the fixture's approved lamp range.
  • Match color code 841 when maintaining the same light color is important.
  • Use order code 21274 as a strong cross-check when a seller provides it.
  • For LED conversions, confirm whether the replacement is ballast-compatible, ballast-bypass, or otherwise requires a specific wiring method.

The Replacement Index separates reference specifications from retailer listings. A product appearing for sale does not by itself establish compatibility.

Frequently asked questions

Is G23 enough to identify a replacement?

No. Match the complete lamp identity, including base, pins, wattage, color information, and the fixture's electrical requirements.

Can I replace CF7DS/841/ECO with LED?

Possibly, but only with an LED product designed for the exact socket and electrical configuration. Some retrofits use a compatible ballast and others require different wiring.

What should I compare first?

Start with manufacturer order code 21274 when it is visible, then confirm the full model, base, wattage, pins, and color code.

Source provenance

The specifications above come from the source records attached to this catalog entry. Retail marketplace data is maintained separately.

  • LEDVANCE / SYLVANIADULUX S ECOLOGIC Compact Fluorescent Lamps · supports series guidance · accessed 2026-09-09
  • LEDVANCE / SYLVANIADULUX S ECOLOGIC Compact Fluorescent Lamps specification sheet · supports specifications · accessed 2026-08-18