Edge‑Lit Exit Signs — Buyers Guide (Code, Mounting & Selection)

Overview: What Is an Edge‑Lit Exit Sign?

Edge‑lit exit signs illuminate etched “EXIT” legends through a clear or mirrored acrylic panel. The LEDs are hidden in a slim housing, so the sign reads as a clean pane with minimal visual weight—great for design‑forward interiors where bulky boxes would distract.

• Look: slim, architectural profile with clear or mirrored panel.
• Legend: red or green letters, single‑ or double‑face, with field‑applied chevrons (arrows).
• Mounting: universal canopy supports ceiling, end/flag, or wall/back mount; some models support recessed installs with trim kits.
• Compliance: Listed to UL 924 for emergency lighting and typically used to satisfy egress marking in NFPA 101/IBC occupancies—always confirm details with your AHJ.

Code Basics: UL 924, NFPA 101 & AHJ

Most jurisdictions require listed exit signage. For edge‑lit models, look for UL 924 listing, adhere to NFPA 101 (Life Safety Code) illumination/visibility requirements, and follow any local amendments your Authority Having Jurisdiction (AHJ) enforces.

• Letter height: Typically 6 in. minimum; some cities (e.g., parts of NYC/Chicago) require 8 in. in certain occupancies or conditions. Verify with your AHJ.
• Backup time: 90 minutes minimum on battery per UL 924 for emergency operation.
• Testing: Monthly 30‑second and annual 90‑minute tests are common maintenance expectations.

If you’re new to exit code, skim our broad primer: Exit Signs 101.

Red vs Green Letters: Visibility & Selection

Both colors meet code when used on listed signs; selection often comes down to visibility against finishes and brand standards. Some AHJs or campuses standardize one color for consistency across buildings.

• Contrast: Red pops against cool/neutral palettes; green can read calmer in healthcare or biophilic schemes.
• Glare/ambient: In bright lobbies, compare both colors on site to avoid washout.
• Standardization: Ask your AHJ or facility team which color is preferred campus‑wide.

Deep dive: Red vs Green Letters for Edge‑Lit Exit Signs.

Single‑ vs Double‑Face: Sightlines & Corridors

Use single‑face for walls and one‑direction travel; choose double‑face for open areas, T‑intersections, or corridor splits where occupants approach from two directions.

• Rule of thumb: If people approach from both sides, plan double‑face.
• Canopy orientation: Universal canopies support ceiling or end mounting to put the legend in the right sightline.
• Arrows: Apply the correct chevrons after you confirm door swing and final egress path.

Planning guide: Single‑ vs Double‑Face Edge‑Lit.

Mounting & Wiring: Ceiling, End/Flag, Wall/Back

Most edge‑lit signs ship with a universal canopy. Ceiling mount drops the panel from above, end/flag mount projects it from a wall, and wall/back mount places the housing directly on the wall surface. Keep access to the test switch/indicator clear.

1. Kill the circuit and verify the feed (120/277 VAC).
2. Set canopy orientation and secure the mounting plate.
3. Make splices per label, observing polarity and local code.
4. Attach housing, hang panel, level, then apply chevrons.
5. Perform functional test and record per maintenance log.

Step‑by‑step details: Edge‑Lit Mounting & Wiring Guide.

Electrical & Battery Backup

• Input: 120/277 VAC, low power consumption with LED source.
• Backup: 90‑minute nickel‑cadmium or lithium battery packs depending on model; look for self‑test options to automate monthly checks.
• Indicators: Bi‑color LED plus push‑to‑test button are common.
• Circuit options: Dual‑circuit and remote‑capable variants exist on some families.

Decision Matrix: Edge‑Lit vs Photoluminescent vs Thermoplastic

Further reading: Edge‑Lit vs Photoluminescent vs Thermoplastic.

Common Applications & Finishes

Edge‑lit signs show up where appearance matters as much as compliance:

• Hospitality: lobbies, ballrooms, meeting spaces—clear panel with satin or black housing.
• Healthcare: patient floors and corridors—green legends are often preferred to feel calmer.
• Corporate: reception areas and conference suites—mirrored panel for a premium look.

Quick Specs & Mini AHJ Checklist

• Listing: UL 924 emergency lighting.
• Input: 120/277 VAC, LED source.
• Backup: 90 min minimum; consider self‑test for automated checks.
• Legend: Red or green; 6 in. typical (verify if 8 in. is required).
• Faces: Single or double; confirm sightlines before ordering.
• Mounting: Ceiling, end/flag, wall/back; keep test switch accessible.

FAQ