Exit signs that require no electricity are a reliable and code-compliant solution for commercial buildings. Known as non-electric exit signs, these fixtures provide continuous illumination without wiring or battery backup. This guide walks you through the available types, how they work, and how to determine which one fits your environment.
Photoluminescent Exit Signs
Photoluminescent exit signs use phosphorescent materials that absorb ambient light and glow in the dark when the lights go out. They require no electricity, wiring, or batteries and are code-compliant when installed in areas with sufficient illumination.
- Charge using fluorescent or LED light sources
- Long lifespan with no maintenance
- UL 924 and NFPA compliant
- Ideal for indoor use with consistent lighting
Tritium Exit Signs
Tritium exit signs use sealed glass tubes filled with tritium gas to create light through radioluminescence. These signs operate 24/7 without external power or light exposure, making them completely independent and ideal for darker or remote locations.
- Self-powered—glow continuously for up to 20 years
- No ambient light needed to function
- No bulbs, wiring, or batteries
- UL 924 listed and code compliant
What Are Self-Luminous Exit Signs?
“Self-luminous” refers to exit signs that do not rely on electricity or ambient lighting. Tritium signs are the primary type. Because they glow on their own, they are especially helpful in locations where running wiring would be impractical or cost-prohibitive.
- Work without light, power, or maintenance
- Operate in harsh or outdoor environments
Photoluminescent vs. Tritium: How to Choose
| Feature | Photoluminescent | Tritium (Self-Luminous) |
|---|---|---|
| Power Source | Ambient light | Tritium gas (self-powered) |
| Use Case | Lit interior spaces | Dark or remote locations |
| Installation | Mount and go | Mount and go |
| Maintenance | None | None—responsible end-of-life disposal |
Maintenance & Compliance
- Both options meet UL 924 and NFPA 101 requirements
- No monthly testing or bulb replacement
- Photoluminescent signs need consistent light exposure
- Tritium signs should be disposed of via a certified program
Are Non-Electric Signs Reliable?
Yes—both types are known for long-term reliability. Photoluminescent signs glow reliably for over 20 years when properly charged, and tritium signs glow continuously regardless of lighting or power conditions.
How Long Do They Last?
- Photoluminescent: 20–25 years in typical use
- Tritium: Available in 10-, 15-, or 20-year models
Cost Considerations
Non-electric exit signs eliminate the ongoing energy cost, labor for monthly testing, and electrical installation expenses. Though unit prices vary, the long-term savings are significant for facilities of any size.
Making an Informed Decision
Photoluminescent exit signs are perfect for well-lit environments that remain occupied during emergencies. Tritium signs shine—literally—in areas where lighting is unreliable or non-existent. Both options meet national safety codes, require no electricity, and offer peace of mind during an emergency. Browse our selection of Photoluminescent Exit Signs and Tritium Self-Luminous Exit Signs to find the right fit for your building.
Download Non-Electric Exit Signs: A Practical Guide for Informed Buyers (PDF)