4 Pin Plug-In

Plug-In CFL Light Bulbs: Energy-Efficient Lighting for Commercial Fixtures

Plug-in CFL light bulbs are an efficient and longer-lasting alternative to incandescents. Available in twin-tube, quad-tube, and spiral shapes, these lamps can only be used with electronic ballasts specially designed for 4-pin lamps. Plug-in CFLs come in several color temperatures ranging from 2700 Kelvin, which produces a warm light similar to incandescents, to a full spectrum 6500 Kelvin that simulates daylight. Capable of withstanding high temperatures and enclosed applications, plug-in CFLs are commonly used in a wide range of applications including warehouse lighting, retail displays, and downlights.

Plug-in CFL Base Types

Each 4-pin CFL uses a unique base code that includes a letter and number to indicate the pin type and spacing (measured in millimeters). These plug-in bulbs are not interchangeable, so it's crucial to check your fixture’s socket before purchasing.

Here’s a quick guide by wattage and base type, with direct links for easy browsing:

• 7W – 2G7 Base
• 9W – 2G7 Base
• 13W – 2GX7, G24q-1, GX24q-1
• 14W – G24q-2 Base
• 18W – G24q-2, GX24q-2, 2G11
• 21W – G24q-3, GR10Q
• 24W – 2G11 Base
• 25W – 2G11 Base
• 26W – G24q-3, GX24q-3
• 27W – GX10q-4 Base
• 28W – 2G11, GR10Q
• 32W – GX24q-3 Base
• 36W – 2G11 Base
• 38W – GR10Q-4 Base
• 40W – 2G11 Base
• 42W – GX24q-4 Base
• 50W – 2G11 Base
• 55W – 2G11, GR10Q-3
• 57W – GX24q-5 Base

Looking to upgrade? Plug-in LED replacements are available for many 4-pin CFL sockets—offering even greater energy efficiency and compatibility with existing fixtures.

Installation Tips for 4 Pin Plug-In CFLs

• Always double-check your base type and socket size before purchasing
• Do not attempt to force a 4-pin bulb into an incompatible fixture
• Ensure your fixture uses an electronic ballast compatible with 4-pin designs
• For enclosed or high-heat environments, verify the bulb’s temperature rating in the spec sheet
• Consider replacing worn or loose sockets with replacement CFL lamp holders

Frequently Asked Questions (FAQs)

What is a 4 prong light bulb?

A 4 prong light bulb—also known as a 4 pin light bulb—has four pins at its base and is commonly used in plug-in CFL fixtures that rely on electronic ballasts for power regulation.

Are 4 pin CFL bulbs interchangeable?

No. Each 4 pin lamp bulb has a unique base configuration (e.g., 2G11, G24q, GX24q) and is only compatible with fixtures that match that specific base. Always check your fixture before purchasing.

Can I replace a 4 pin CFL bulb with an LED?

Yes. Many 4 pin CFLs have LED plug-in equivalents designed for the same base types. These LED alternatives offer longer life, instant-on light, and greater energy savings. Check product specs for ballast compatibility.

Need help selecting the right 4 pin CFL bulb for your fixture? Call our expert team at 1-888-368-1290 for personalized support.