Fluorescent Emergency Ballasts for Backup Lighting
An emergency ballast supplies temporary battery power to compatible fluorescent lamps when normal AC power fails. It combines a charger, battery and emergency control circuit so an existing fixture can provide reduced-output emergency illumination during an outage.
This collection is intended for compatible fluorescent lighting systems. LED fixtures generally require an LED emergency driver rather than a fluorescent emergency ballast.
Emergency Ballast vs LED Emergency Driver
The terms are sometimes used interchangeably in searches, but the products are not automatically interchangeable. A fluorescent emergency ballast is selected around compatible fluorescent lamp types and fixture wiring. An LED emergency backup driver is designed around the electrical requirements of an LED load or luminaire. Confirm the existing light source before ordering.
How an Emergency Ballast Works
During normal operation, building power runs the fixture and keeps the emergency battery charged. When normal power is interrupted, the emergency ballast automatically switches the designated lamp or lamps to battery operation. Emergency light output is typically lower than normal fixture output and varies by model.
Compare Emergency Lumen Output
The collection includes 500-, 700- and 1400-lumen emergency ballast options. Output is only one selection factor: lamp compatibility, emergency runtime, fixture construction, voltage, operating temperature and required listing must also match the project.
- 500-lumen models for lower-output or space-constrained applications
- 700-lumen models for intermediate emergency output
- 1400-lumen models where the compatible system requires higher emergency output
What to Verify Before Ordering
- Lamp technology, type, wattage and quantity
- Normal input voltage and emergency operating requirements
- Rated emergency lumens and runtime
- Ballast dimensions and available fixture space
- Battery location, chemistry and replacement requirements
- Wiring diagram, test switch and charging-indicator requirements
- Product listing and allowable operating temperature
Use the exact product specification sheet and wiring diagram. Similar lumen ratings do not guarantee electrical or physical compatibility.
Replacing an Existing Emergency Ballast
Record the existing model number, lamp information, input voltage, fixture wiring and available space before selecting a replacement. When the original model is obsolete, use a manufacturer-approved cross-reference or have a qualified lighting professional confirm the replacement. Do not substitute solely by battery voltage or emergency lumen rating.
Retrofit or Complete Emergency Fixture?
An emergency ballast can be appropriate when a compatible fluorescent fixture remains serviceable and the project calls for integrated backup operation. A complete emergency light may be more practical when the existing fixture is damaged, obsolete or being converted to LED. Coordinate the lighting system with battery-backup exit signs and exit sign and emergency light combo units where required.
Installation and Testing
Emergency ballasts should be installed by qualified personnel according to the supplied wiring diagram, product listing and applicable requirements. After installation and charging, test transfer to emergency operation and verify the designated lamp illuminates. Follow the manufacturer and facility requirements for functional and full-duration testing.
Emergency Ballast FAQs
Can an emergency ballast be used with LED lamps?
Not unless the exact ballast and lamp combination is specifically approved. Most LED applications use an LED emergency driver instead.
Is the emergency lumen rating the same as normal output?
No. The emergency rating describes output during battery operation and is commonly lower than the fixture’s normal light output.
Can I replace an emergency ballast by matching only the model’s lumens?
No. Lamp compatibility, voltage, wiring, dimensions, runtime, temperature and listing must also be confirmed.
