floridafiresafety.orgThe main fixture categories
Emergency and exit lighting equipment falls into five broad categories. Most small commercial buildings use one or two of them in combination.
| Fixture type | What it does | Common use case | Battery backup |
|---|---|---|---|
| Exit sign (stand-alone) | Marks exit location and direction only — does not illuminate the path | Above exit doors in well-lit corridors where separate emergency lights provide path illumination | Yes — 90 min required |
| Emergency lighting unit (stand-alone) | Provides floor-level illumination of egress path during power failure; does not mark exits | Mid-corridor placement between exit signs; stairwells; large open floor areas | Yes — 90 min required |
| Combination exit sign / emergency light | Single fixture that does both: marks the exit and illuminates the path below it | The standard choice for most small commercial occupancies (offices, retail, restaurants) | Yes — 90 min required |
| Remote head unit | An emergency light head powered by a central battery or a larger host fixture — no battery of its own | Areas requiring coverage that the main unit can't reach; stairwell tops and landings | Via central system or host unit |
| Central battery system | A single battery cabinet powers all exit signs and emergency lights in the building through dedicated wiring | Larger buildings, high-rise occupancies, healthcare facilities, schools with many fixtures | Centralized — 90 min from single bank |
Light source technology: what's inside the fixture
LED (Light-Emitting Diode) — current standard
The dominant technology in new installations and replacements. LED fixtures consume 2–5 watts compared to 20–40 watts for older fluorescent or incandescent units. Lower power draw means less stress on the battery, which translates to longer battery life and more reliable operation during outages.
Best for: all new installations and retrofits. Lifespan: 50,000+ hours (effectively maintenance-free for the lamp itself). Battery still needs replacement every 3–5 years.
Fluorescent (T5, CFL) — legacy
Common in fixtures installed from the 1980s through mid-2000s. Higher power draw than LED means batteries cycle harder and fail sooner. Fluorescent lamps themselves can fail, leaving a unit that looks operational but provides no light when tested.
Best for: nothing — retrofit to LED when the next service cycle comes around. Watch for: lamps that appear dim or flicker — a sign of impending failure.
Incandescent — obsolete
Still found in very old fixtures. High power draw, short lamp life, large heat output. Any incandescent emergency or exit fixture more than 10 years old should be replaced — the economics of trying to maintain them don't make sense.
Best for: replacement queue. Signal: if your exit signs have bulbs you can change like a household lamp, they're incandescent.
Photoluminescent — specialty
Glow-in-the-dark material that absorbs ambient light and re-emits it during a power failure. No electrical components, no battery. Accepted in specific occupancy types (some low-rise buildings, stairwells in high-rises per IBC and NYC Local Law 26) but requires minimum ambient illumination to charge properly and doesn't satisfy the emergency lighting illumination requirement on its own.
Best for: supplemental stairwell marking in jurisdictions that allow it. Not a standalone solution for most Florida businesses.
Battery types
The battery is the most maintenance-intensive part of any emergency lighting system and the most common point of failure. Understanding the type in your fixtures helps you plan replacement cycles correctly.
| Battery chemistry | Typical lifespan | Characteristics | Florida considerations |
|---|---|---|---|
| NiCad (Nickel-Cadmium) | 3–5 years | The legacy standard. Reliable in temperature extremes. Subject to "memory effect" if repeatedly partially discharged. Hazardous waste disposal required. | Heat shortens cycle life. Expect 3–4 years in un-conditioned spaces. |
| Sealed Lead-Acid (SLA) | 3–5 years | Heavier than NiCad. No memory effect. More sensitive to heat — degrades faster at high temperatures. Common in older and lower-cost fixtures. | Poor choice for hot storage rooms or un-air-conditioned warehouses. Expect 2–3 years in high-heat environments. |
| NiMH (Nickel-Metal Hydride) | 4–6 years | Higher energy density than NiCad, no hazardous cadmium content. Less temperature-tolerant than NiCad but generally more environmentally friendly. | Adequate for climate-controlled spaces. Less common in commercial fixtures. |
| Lithium / LiFePO4 | 7–10 years | Highest energy density, longest service life, performs better across temperature ranges. Higher upfront cost. Increasingly standard in premium LED fixtures. | Best choice for Florida heat. Longer replacement cycles reduce labor cost over time. |
What do I need, by industry?
The setups below reflect what most businesses in each category run. Your AHJ always has final say — this is a planning guide, not a code substitution.
Professional office (under 5,000 sq ft, single floor)
- Combination LED exit sign / emergency light above each exit door.
- Additional emergency lighting mid-corridor if any corridor exceeds 100 feet without coverage (NFPA 101 requires illumination throughout the egress path).
- One unit near the main electrical panel or server closet is good practice even where not strictly required.
- Stairwells (if any): standalone emergency lighting unit at each landing.
Retail store or boutique
- Combination units above all exit doors — including the back stockroom exit.
- If the floor plan has aisles where the exit is not clearly visible from every point, directional exit signs at the aisle ends.
- Storage / receiving area: at least one emergency light covering the path to the exit.
- Fitting rooms and restrooms: not typically required unless they're on the egress path with no clear exit visible.
Restaurant, café, or bakery
- Combination units above all customer exits (front door, patio exit) and staff exits (back-of-house door).
- Walk-in coolers and freezers: emergency lighting inside is required in many jurisdictions — verify with your AHJ. A cold-rated unit is needed in these environments.
- If the dining room has low ambient light (dim restaurant atmosphere), the AHJ may require emergency lighting even along well-marked paths — test illumination levels.
- Kitchen exhaust environment: fixtures near cooking areas should be rated for the grease-laden environment.
Warehouse, self-storage, or light manufacturing
- Exit signs at all exit doors — often with directional arrows since exits may not be visible from every aisle position.
- Emergency lighting units at regular intervals along main travel aisles — high-bay warehouses require careful photometric planning to achieve the 1 foot-candle floor-level standard.
- Loading docks: emergency lighting covering the path from dock to exit.
- Mezzanines: treat as a separate level — exit signs and emergency lighting for the mezzanine stairway and any mezzanine egress path.
- High-rack storage: units must be positioned to illuminate the floor-level path, not just shine into the rack faces.
Medical or dental office, urgent care clinic
- Standard combination units at all exits and along egress corridors.
- Treatment rooms and exam rooms: typically require emergency lighting if patients may need assistance evacuating (ambulatory vs. non-ambulatory occupancy determination).
- Facilities under NFPA 99 (healthcare occupancies with certain patient care activities): stricter egress illumination requirements — consult a licensed fire protection engineer.
- Generator-backed emergency power systems may be required for certain healthcare occupancies, which changes how emergency lighting is designed.
School, daycare, or place of assembly
- Exit signs at all exits and at all egress path decision points — assembly occupancies have additional requirements because of high occupant loads.
- Emergency lighting along all corridors, in every classroom (NFPA 101 Assembly occupancy requirements), and in auditoriums or gymnasiums.
- Exterior: emergency lighting covering the path from exit doors to a public way — particularly important for schools where evacuation happens in an open campus.
- Central battery systems are common in schools to simplify testing and documentation.
Hotel, motel, or lodging
- Exit signs and emergency lighting in every corridor on every floor.
- Stairwells: emergency lighting at every landing — stairwells are explicitly listed in NFPA 101.
- Guest rooms: exit signs visible from each guest room door; emergency lighting in the corridor immediately outside each door. Rooms themselves are not typically required to have emergency lighting.
- Lobby and common areas: full emergency lighting coverage.
- Hotels are a "high-life-safety" occupancy type — expect the strictest interpretation of NFPA 101 from your AHJ.
Auto shop, body shop, or mechanic
- Combination units at all exits from the shop floor.
- Fixtures in the shop area must be rated for the environment — wet/damp location rating, and in paint booth areas, explosion-proof rating may be required.
- Office area: standard LED combination units.
- Underground pits or below-grade work areas: emergency lighting is required in enclosed below-grade spaces.
Central battery systems: when do they make sense?
A central battery system replaces the individual batteries in each fixture with a single battery bank, usually housed in a dedicated cabinet. All fixtures wire back to the cabinet through dedicated emergency circuits.
Central systems make sense when:
- You have more than 20–30 fixtures — managing individual battery replacements at scale becomes labor-intensive and error-prone.
- Your occupancy type requires documented 90-minute testing for many units simultaneously (schools, hospitals, assembly halls).
- You have a generator that can be configured to power the emergency lighting system — eliminating the battery question entirely during extended outages.
- Your AHJ or insurance carrier requires centralized monitoring.
Central systems are generally not cost-effective for small single-tenant spaces under about 10,000 sq ft. The wiring infrastructure cost outweighs the maintenance convenience at that scale.
Common questions, answered
"What's the difference between a 'wet location' and a 'damp location' rating?"
A damp-location rating (IP44 or similar) is sufficient for covered outdoor areas, enclosed parking, and areas subject to condensation. A wet-location rating (IP65 or UL Listed for wet locations) is required for exposed outdoor areas, car washes, commercial kitchens, and anywhere the fixture may be directly sprayed with water. Using a damp-rated fixture in a wet location is a code violation and a failure risk.
"Can I put an exit sign on the wall instead of above the door?"
Yes — NFPA 101 allows exit signs to be mounted on the wall adjacent to the door if the mounting height allows it to be visible. The sign must be mounted so the bottom of the sign is no lower than 80 inches above the floor, and the sign must be clearly visible from the approach path. Above the door is usually the simplest compliant position and what most AHJs prefer.
"Do I need a 'running man' pictogram sign or just the word EXIT?"
In Florida, the word "EXIT" is the standard required by the IFC and NFPA 101. The ISO 7010-style running man pictogram (common in Europe and increasingly in the US) is accepted in many jurisdictions as an alternative or supplement. Check with your AHJ before substituting pictogram-only signs — some local fire marshals still require the word "EXIT."
"My exit sign has an arrow — is that required?"
Directional arrows are required on exit signs that are not located directly above an exit door — i.e., signs that mark the direction of travel toward an exit rather than the exit itself. NFPA 101 requires the arrow to clearly indicate the direction to the exit. Signs located directly above a door (where the exit is unmistakably right there) do not need an arrow.