LED Plug-In (PL) Lamps: G24, GX23, and 4-Pin Replacements
Plug in light bulbs, commonly known as PL lamps, are specialized, energy-efficient LED solutions designed for PL lamp replacement in commercial and institutional fixtures. These LED plug in light bulbs feature distinct 2-pin and 4-pin bases for sockets previously occupied by compact fluorescent (CFL) lamps. Unlike screw-base bulbs, pin-based lamps use a specific pin layout and keyed base to connect to the fixture. The base identifies the physical connection; ballast-compatible and ballast-bypass designs determine how the LED lamp receives power.
Key Advantages of LED PL Retrofit Lamps
Switching to LED PL lamps can upgrade commercial lighting without replacing the entire fixture.
- Energy Savings: LED CFL replacement lamps use less power to deliver comparable light output. A 10W–13W LED replacement for a 26W CFL illustrates the difference between actual power consumption and replacement wattage; lumen output describes brightness, while watts describe power use. Ballast losses also affect total system consumption.
- Compatibility: Available as 2 pin LED bulb and 4 pin LED bulb options for existing recessed and ceiling fixtures. Ballast-compatible models retain an approved existing ballast, while ballast-bypass models operate from the specified line-voltage connection after conversion.
- Instant Start-Up: LEDs reach full brightness without the warm-up period associated with CFLs. Ballast compatibility and the dimming arrangement still affect flicker and stable operation.
- Reduced Maintenance: The long life of LED PL bulbs is valuable in commercial spaces where replacing high-ceiling lamps is costly and time-consuming. Rated lamp life provides the basis for maintenance planning rather than a universal lifespan multiplier.
Understanding LED PL Lamp Bases
Choosing the correct base is critical for a successful installation. LED PL lamps fit specific fluorescent sockets. The number of pins and the letters on the existing bulb identify the base family, while suffixes distinguish keyed variants within that family.
- 2-Pin Bases (G24d & GX24d): In traditional CFL systems, these bases are associated with magnetic-ballast operation. The LED replacement may instead use a ballast-bypass design, so the pin count is not a description of its operating method.
- 4-Pin Bases (G24q & GX24q): In traditional CFL systems, these bases are associated with electronic ballasts. LED versions include ballast-compatible and bypass configurations; four pins alone do not make different base families interchangeable.
The table below identifies the fluorescent base codes and nominal CFL wattages represented in the original base guide. These are fluorescent identification references, not LED power ratings or a claim that every LED base fits every keyed variant.
| Pin Count | Base Family | Fluorescent Base / Nominal CFL Wattage |
|---|---|---|
| 2-Pin | G24d GX24d |
G24d-1 (13W CFL) G24d-2 (18W CFL) G24d-3 (26W CFL) GX24d-1 (13W CFL) GX24d-2 (18W CFL) GX24d-3 (26W CFL) |
| 2-Pin | G23 | G23-1 (9W CFL) G23-2 (9W CFL) |
| 2-Pin | GX23 | GX23-1 (13W CFL) GX23-2 (13W CFL) |
| 4-Pin | G24q GX24q |
G24q-1 (13W CFL) G24q-2 (18W CFL) G24q-3 (26W CFL) GX24q-1 (13W CFL) GX24q-2 (18W CFL) GX24q-3 (26W CFL) GX24q-4 (42W CFL) |
| 4-Pin | 2G7 | 2G7 (9W CFL) |
| 4-Pin | 2GX7 | 2GX7 (13W CFL) |
| 4-Pin | 2G11 | 2G11, with lamp length and wattage varying by format |
Understanding Fluorescent Tube Shapes and Bases
The original fluorescent lamp’s shape helps identify its replacement format. Tube arrangement, base family, and lamp length describe different features of a pin-based CFL.
- Twin: Characterized by two parallel tubes, compact twin-tube CFLs are commonly associated with G23 and GX23 bases.
- Quad: Four fluorescent tube sections form a compact lamp. Compact multi-tube families include two-pin G24d and four-pin G24q base formats; the tube arrangement does not change the pin-count distinction.
- Triple: Triple-tube CFLs pack additional fluorescent tube length into a compact space. GX24d and GX24q are base families used with triple-tube formats.
- Twin PLL: Long twin-tube PL-L lamps are associated with the four-pin 2G11 base. The collection also includes 2G7 and 2GX7 compact four-pin lamps, which are separate formats rather than interchangeable 2G11 replacements.
For straight linear fluorescent fixtures, LED tube lights provide a different replacement format from compact PL lamps. Linear tubes and compact pin-based lamps use different dimensions and connections.
Ideal Uses for Commercial PL Light Bulbs
PL lamps are widely used for downlighting and ambient lighting in non-residential buildings.
- Recessed Downlights: A common application for PL light bulbs in hallways, offices, and retail spaces. Horizontal and vertical lamp positions affect how the light reaches the reflector and the space below.
- Wall Sconces: Used in schools, hospitals, and commercial buildings for ambient lighting. Lamp orientation and light distribution influence how evenly the diffuser is illuminated.
- Enclosed Fixtures: Enclosed ceiling fixtures and exterior canopies need lamps rated for their heat and environmental conditions. Enclosed-fixture approval and moisture ratings are separate from the base designation.
- Hotels and Hospitality: Long-life lamps serve public areas and guest rooms, reducing maintenance calls. Color temperature and consistent light output help maintain a uniform appearance across repeated fixtures.
Fixtures designed for a conventional A-shaped bulb belong to a different replacement category: type A light bulbs. A shared sconce or ceiling-light application does not make these bulbs direct substitutes for pin-based PL lamps.
Your Trusted Partner for Commercial PL Retrofits
The right plug in light bulb combines the correct base and electrical design with the light output needed for the space. Whether the application uses a 2 pin LED bulb or a 4 pin LED bulb, ballast-compatible and ballast-bypass options offer different approaches to PL lamp replacement.
Bees Lighting’s LED PL bulbs sit within the wider LED light bulbs range, with pin-based formats for commercial CFL retrofit applications.
