Sylvania Dulux S T4 Compact Fl...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4.20
Sylvania Dulux S T4 Compact Fluorescent Lamp, 13W

Sylvania Dulux S T4 Compact Fluorescent Lamp, 13W

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Model: 21137

In Stock (leaves warehouse same day if ordered before 3pm ET)

$4.20
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Sylvania 21134 Dulux S T4 Compact Fluorescent Lamp, 13W, GX23-2 Base, 4100K

The Sylvania 21134 Dulux S T4 Compact Fluorescent Lamp is a 13-watt, single-ended CFL built on the reliable 2-pin GX23-2 base for easy replacement in existing fixtures. Rated at 800 lumens with an 82 CRI and a 4100K cool white color temperature, this lamp delivers consistent, accurate color rendering for task lighting, downlights, and general-purpose commercial and residential fixtures that call for a compact, energy-efficient fluorescent source. As part of Sylvania's Dulux S family, the 21134 is engineered to be a straightforward drop-in solution for facilities and installers who need dependable performance from a name they already trust for lamp quality.

Key Features

  • Wattage: 13-Watt CFL for efficient energy use compared to legacy incandescent sources.
  • Base Type: 2-Pin GX23-2 base for compatibility with standard Dulux S / single-ended CFL fixtures.
  • Light Output: 800 lumens of usable light output for reliable illumination in task and general lighting applications.
  • Color Rendering: 82 CRI for accurate, natural-looking color rendition.
  • Color Temperature: 4100K cool white color temperature suited to commercial and utility spaces.
  • Lamp Type: T4 compact fluorescent construction, part of the Dulux S series, for a slim, space-saving footprint in compact fixtures.

Technical Specifications

  • Lamp Type: T4 Compact Fluorescent
  • Wattage: 13-Watt
  • Base: 2-Pin GX23-2
  • Lumens: 800
  • CRI: 82
  • Color Temperature: 4100K
  • Series: Dulux® S

Typical Applications

  • Commercial Downlight and Task Lighting Fixtures
  • Single-Ended CFL Retrofit Applications
  • Office, Hospitality, and Institutional Lighting
  • Compact Fixture and Luminaire Replacement

Why Sylvania?

Sylvania's Dulux S compact fluorescent lamps are engineered for consistent lumen output, accurate color rendering, and dependable base compatibility, making the 21134 a practical choice for professionals replacing or maintaining single-ended CFL fixtures. With a proven 4100K/82 CRI light profile and a standard GX23-2 base, this lamp offers straightforward, code-compliant performance for commercial and general lighting needs.

Manufacturer Resources

Product Specs

list_batch:
SYL-20260924
Product Subgroup:
Lamps & Bulbs
Product Wattage:
13W
Product Group:
Lighting
CRI:
82
Department:
Electrical
Product Type:
Compact Fluorescent Lamp
Base:
GX23

Sylvania 21137 – Frequently Asked Questions

1) Will a Sylvania Dulux S 13W lamp fit a GX23-2 two-pin socket?
Yes. The Dulux S T4 13-watt lamp uses a 2-pin GX23-2 base, which is the standard socket on single-ended 13W CFL fixtures. It drops straight into an existing GX23-2 lampholder with no fixture change. Note it is a 2-pin lamp, so it runs on a magnetic ballast with an integral starter in the base, not a 4-pin electronic ballast socket (GX23 4-pin lamps will not seat in a 2-pin holder and vice versa).
2) Can I put this 13W CFL in a fixture that currently has a 9W or 18W Dulux S lamp?
No. Two-pin CFLs are wattage-specific and the ballast in the fixture is matched to one wattage, so a 13W Dulux S belongs only in a fixture ballasted for 13W. The GX23 family also keys differently by wattage, so a 9W GX23 lamp and this 13W GX23-2 lamp are not meant to swap. Check the label inside the fixture or the old lamp for the wattage before ordering.
3) What color temperatures does the Sylvania Dulux S T4 13W CFL come in?
Two: 4100K cool white (Sylvania 21134) and 3500K neutral white (Sylvania 21137). If you are relamping a space and want the existing look to carry over, 4100K reads cooler and more utility/office, 3500K reads warmer and is common in hospitality and lobbies. Mixing the two in the same ceiling is visible, so pick one and stay with it.
4) How much light does a 13W Dulux S T4 compact fluorescent put out?
800 lumens, at 82 CRI. That is enough for a single-lamp downlight or a task/wall-sconce position in an office or corridor. The 82 CRI puts it in the normal commercial fluorescent range for color accuracy, fine for general and task lighting but below what you would want for retail color matching or art display.
5) Which Sylvania part number do I order for 4100K vs 3500K Dulux S 13W?
Order 21134 for the 4100K version and 21137 for the 3500K version. Both are the same 13W T4 Dulux S lamp on the GX23-2 two-pin base, 800 lumens, 82 CRI; only the color temperature changes. For a facility standardizing across floors, pick the number once and spec it on the PO so field crews do not mix the two.
6) What fixtures is a single-ended T4 Dulux S lamp normally used in?
Compact downlights, task and under-cabinet fixtures, sconces, and small commercial luminaires built around a single-ended CFL socket. The T4 tube diameter keeps the lamp slim, which is why it shows up in shallow recessed cans and tight decorative housings where a twin-tube 4-pin lamp will not clear the reflector.
How fast can I get the Sylvania 21137 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sylvania 21137 come with a warranty?
Absolutely. The Sylvania 21137 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sylvania 21137?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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