What Is Ballast?
Ballast is a device in certain fluorescent and high-intensity discharge light fixtures that controls electrical current through the lamp. The ballast helps the lamp start, limits current during operation, and supports steady light output. Modern LED fixtures often use a separate driver instead of a traditional ballast.
Quick Facts About Ballast
Category
Lighting control component
Used for
Fluorescent and discharge lamps
Common confusion
Confused with an LED driver
Often discussed with
Light Fixture Installation
Key Takeaways About Ballast
- A ballast controls current, unlike a lamp socket.
- Ballast type must match the fixture and lamp.
- An LED driver is not the same as a fluorescent ballast.
How Ballast Works
Ballast controls the electrical current that reaches a compatible lamp. During startup, the ballast helps establish the conditions needed for the lamp to begin producing light. After startup, the ballast limits current and helps maintain stable operation.
Related glossary terms: LED Driver, Light Socket, Line Voltage.
Ballasts may be magnetic or electronic, and each type works with particular lamps and fixture wiring. An electronic ballast may provide quieter operation and faster starting than a magnetic design. An LED driver performs a related control function in many LED fixtures, but the two components are not interchangeable. During light fixture installation, the fixture design, lamp type, wiring, and control method must agree before power is restored.
From the San Bernardino Electrician team
When we inspect a fixture, we identify the lamp type and ballast design before changing wiring or components. We check the ballast, sockets, connections, and fixture condition together. For an LED conversion, we verify whether the existing ballast remains part of the approved setup or whether the fixture needs a different wiring arrangement.
Ballast in Practice: A Real-World Example
A fluorescent ceiling fixture may flicker, hum, or start slowly when its ballast is failing. During a light fixture installation, the replacement fixture must match the existing wiring and control arrangement.
Related Services
Related Terms
LED Driver
An LED Driver is an electronic power-conversion device that supplies LEDs with the voltage or regulated…
Light Socket
A light socket is the electrical component that holds a lamp and connects it to the…
Line Voltage
Line Voltage is the electrical pressure supplied by a power system to operate equipment, lighting, and…
Current
Current is the movement of electric charge through a conductor, such as a wire, circuit path…
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