What Is a Ballast?
A ballast is an electrical device that controls current in certain types of lamps. It helps a fluorescent or high-intensity discharge lamp start and operate without drawing excessive current. The ballast sits within or near the light fixture and must match the lamp's electrical needs.
Quick Facts About Ballast
- Category
- Lighting component
- Used for
- Fluorescent and high-intensity discharge lamps
- Common confusion
- Ballast versus lamp
- Also called
- Lighting ballast, Lamp ballast
- Often discussed with
- Electrical Troubleshooting
Key Takeaways About Ballast
- Electronic and magnetic ballasts work in different ways.
- Flickering alone doesn't prove the ballast has failed.
- A ballast isn't the same part as a lamp.
How Ballast Works
A ballast supplies the electrical conditions a compatible lamp needs to start. Once the lamp is glowing, the ballast limits the current flowing through it. Without that limit, the lamp could draw too much current. Related service: Electrical Troubleshooting.
Related glossary terms: Flickering Lights, Electrical Load, Branch Circuit.
A magnetic ballast uses coils to limit current. An electronic ballast uses electronic parts to manage the lamp's power. Electronic designs can reduce the hum and flicker associated with some magnetic designs.
Ballasts are designed for particular lamp types and electrical supplies. A fixture's label and the ballast's markings help identify a suitable match. Some LED replacement tubes work with a compatible ballast, while others need a fixture wired to bypass it. The tube's instructions identify the setup it needs.
From the Earth Electric team
When we troubleshoot a light fixture, we check the lamp and its connections as well as the ballast. We also review the fixture and ballast markings before choosing a replacement. That helps us match the part to the lamp and the supply.
Ballast in Practice: A Real-World Example
A fluorescent light in a Miami kitchen flickers after the lamp is replaced. During electrical troubleshooting, an electrician checks the fixture and finds a failed ballast.
Related Services
Related Terms
Flickering Lights
Flickering Lights are lights that change brightness repeatedly or briefly go dark.
Electrical Load
An electrical load is the demand for electrical power placed on a circuit or electrical system by connected equipment.
Branch Circuit
A branch circuit is an electrical circuit that runs from the final circuit breaker or fuse to the outlets or equipment it supplies.
Earth Electric
Have Questions About Ballast?
Contact Earth Electric for practical guidance on Ballast and related 24 hour electrician work in Miami.