Photosensor Emergency Lights

Photosensor/Photocell Emergency Light FAQ

Q: What is a photosensor emergency light?
A: A photosensor emergency light is a fixture that uses a built-in light sensor (photocell) to automatically turn on when it gets dark and turn off when daylight returns. Many models also include emergency battery backup so the light stays on during power outages.

Q: How do photosensors work?
A: Photosensors detect ambient light levels. When light drops below a preset threshold (like dusk, storms, or dark corridors), the fixture switches on automatically without needing a manual control or timer.

Q: Do photosensor emergency lights work during a power outage?
A: Yes — if the unit includes an emergency battery backup, it will provide illumination during a power failure. Emergency-rated models are designed to meet UL 924 requirements.

Q: Where are photosensor emergency lights commonly used?
A: They’re ideal for areas that need automatic lighting and added safety, including:

- Building entrances and exits

- Walkways and loading docks

- Stairwells and egress paths

- Perimeter security lighting

- Garages and service areas

Q: Are photosensor emergency lights code compliant?
A: The units we sell are, but as always, it depends on the application and use. If you need emergency egress lighting, choose a unit that is UL 924 listed and verify coverage meets local code requirements.

Q: What’s the difference between a photosensor light and a motion sensor light?
A: A photosensor turns on based on darkness (dusk-to-dawn operation), while a motion sensor turns on when movement is detected. Photosensors are best for consistent nighttime lighting, while motion sensors are best for energy-saving or security-triggered lighting.

Q: Can photosensor emergency lights be used indoors?
A: Yes. They’re often used indoors in areas where lighting is intentionally low or variable, such as:

- Hallways

- Utility rooms

- Storage areas

- Back-of-house corridors

Just ensure the sensor won’t be affected by changing artificial light sources.

Q: Will the photosensor turn the light on during cloudy weather?
A: It can. If ambient light drops enough (heavy clouds, storms, shaded areas), the sensor may activate the light—this is normal and helps maintain safe visibility.

Q: Do I need a switch to control a photosensor emergency light?
A: Our lights are hardwired and operate automatically without a switch. However, local electrical practices may require a wall switch, breaker control, or test switch depending on the installation type (check with your local building department).

Q: Can I override or disable the photosensor?
A: Some models allow bypassing or repositioning the sensor, while others do not. If you need manual control or adjustable settings, choose a fixture that supports override capability.

Q: What maintenance do photosensor emergency lights require?
A: For best performance:

- Keep the sensor lens clean and unobstructed

- Test emergency battery function regularly (especially for code compliance)

- Replace batteries as needed

Q: How do I choose the right photosensor emergency light?
A: Key things to consider:

- Emergency rating (UL 924) if required

- Lumens/output for your space

- Voltage compatibility

- Wet or damp location rating for outdoor use

- Mounting type (wall, ceiling, flood style)

Q: Do these lights stay on all night?
A: Most photosensor models operate dusk-to-dawn, meaning they stay on throughout the night and shut off automatically in the morning.

Any more questions? Contact our award-winning customer service staff and let The Exit Light Co., Inc. help you find the right product for your application.