Circline & CFL Ballasts - T9 & Compact Fluorescent

Why Choose Our Circline & CFL Ballasts?

• Reliable performance – Precise current regulation protects lamps and extends their lifespan
• Energy-efficient options – Electronic ballasts reduce energy use and operate cooler and quieter than magnetic units
• Easy installation – Many circline models include socket connectors for quick replacement
• Wide compatibility – Models for T9 circline lamps (FC8T9, FC12T9, FC16T9) and common 4-pin CFL bases (G24q, GX24q)
• Compact design – Small case sizes fit tight ceiling fixtures, undercabinet lights, and enclosed luminaires
• Easy replacements – Direct cross-references for common OEM circline and CFL ballasts

Common Applications

• Residential ceiling fixtures and flush-mount circline lights
• Kitchen, bathroom, and utility area lighting
• Undercabinet and task lighting with compact fluorescent lamps
• Commercial office, restroom, and hospitality fixtures
• Retail and institutional circular fluorescent luminaires
• Hard-to-reach ceiling installations where long lamp life matters

How to Choose the Right Circline or CFL Ballast

1. Lamp Type & Wattage
   • Circline (T9): Match to FC8T9 (22W), FC12T9 (32W), or FC16T9 (40W)
   • Compact Fluorescent: Match to the wattage and base (example: 26W G24q or GX24q)
2. Number of Lamps
   Select 1-lamp or 2-lamp ballasts according to the fixture configuration.
3. Start Method
   • Rapid Start – Common for most circline and CFL applications
   • Programmed Start – Better for frequent switching and longer lamp life
4. Voltage
   Most models are 120V. Confirm your fixture voltage before ordering.
5. Socket / Connector
   Many circline ballasts include pre-wired sockets for easier installation in existing fixtures.

Brands We Carry

Keystone Technologies — professional-grade T9 circline and compact fluorescent ballasts built for reliable residential and commercial use.

Why Buy from LeanLight?

• Fast & free shipping on every order (ships from Georgia, 1–5 day delivery in the USA)
• Volume and project discounts available
• 30-day satisfaction guarantee with easy returns
• Georgia-based lighting specialists focused on commercial and industrial solutions since 2008

Frequently Asked Questions

What does a circline or CFL ballast do?
A fluorescent ballast provides the high voltage needed to start the lamp and then regulates the current so the lamp operates safely and efficiently without burning out.

What lamps do T9 circline ballasts work with?
T9 circline ballasts typically operate FC8T9 (22W), FC12T9 (32W), and FC16T9 (40W) circular fluorescent lamps with a G10q 4-pin base.

What bases do CFL ballasts support?
Most compact fluorescent ballasts are designed for 4-pin bases such as G24q and GX24q. Always match the ballast to the specific lamp wattage and base type.

Electronic vs. magnetic ballasts — which should I choose?
Electronic ballasts are quieter, more energy-efficient, run cooler, and produce less flicker. Most modern replacements use electronic rapid-start or programmed-start technology.

How do I know which ballast I need?
Look at the existing ballast label or the lamp currently installed. Note the lamp type (circline T9 or CFL), wattage, base, number of lamps, and voltage. You can also search by the old ballast model number for a direct cross-reference.

Do these ballasts work with LED replacements?
Some Type A (ballast-compatible) LED circline or CFL-style lamps can operate with existing fluorescent ballasts. For maximum efficiency, many users prefer ballast-bypass (Type B) LED versions and remove the ballast entirely.