What remote heads are, when to use them, how to size and wire them, and how to pick a compatible remote-capable system that meets code without overbuilding. For product options, see our LED remote head emergency lights and remote-capable emergency lights.
Remote heads are often part of a discreet hybrid approach; see the concealed emergency lighting guide for when recessed units, downlights, and aimable remote heads work together.
In This Series: Remote Head Specific Guides
These deep dives support the pillar without targeting the collection’s primary product terms. We’ve curated links to stay within the internal link budget.
- Remote Head Code Requirements: UL 924 + NFPA 101 + NEC 700 — what inspectors look for and how to document compliance.
- 12V vs 24V for Long Runs — when higher voltage wins on distance and drop.
- Remote Head Wire Gauge & Distance Tables (AWG 18–10) — quick picks to keep drop around 5%.
- Remote Head Spacing 101: Corridors, Stairs & Open Areas — translating photometrics into field layouts.
- Compatibility Matrix: Matching Heads & Hosts — voltage, wattage, and brand-mix considerations.
Application-Specific Remote Head Guides
What Are Remote Heads?
Remote heads are low-voltage emergency lamp fixtures (no internal battery) that connect to a separate emergency light’s battery source. During an outage, the host unit switches to battery and powers its built-in lamps and any connected remote heads over a dedicated low-voltage circuit.
Because they don’t carry their own batteries, remote heads are compact, discreet, and economical. They’re available in indoor thermoplastic, outdoor/wet-location models, and heavy-duty/vandal-resistant variants to match the environment. They must be paired with a remote-capable emergency light designed to supply external load.
When & Why to Use Them
- Long corridors & turns: Extend coverage around corners or to corridor ends without adding multiple battery units.
- High ceilings: Aim heads from elevated points while keeping the battery unit accessible at a service height.
- Outdoor egress: Feed weather-rated heads outside from a protected interior battery source.
- Large open rooms: Distribute heads across exits/aisles while powering them from one central unit.
Key Benefits
- Wider reach: Put light where built-in heads can’t, using one power source.
- Fewer batteries to maintain: Centralized power simplifies testing and replacements.
- Lower visual impact: Small heads blend into ceilings and soffits.
- Flexible aiming: Adjust beams to eliminate dark spots and overlap coverage.
- Environment-matched: Indoor, wet-location, and vandal-resistant options.
Tradeoffs & Limitations
- Low-voltage wiring needed: Plan conduit/runs and terminations.
- Single point of failure: If the host unit/battery fails, all connected heads go dark.
- Capacity limits: Total remote load must fit the host’s wattage for a full 90-minute runtime.
- Upfront host sizing: Higher-capacity units cost more but support more/larger heads.
- Field verification: Aim and test furthest heads—especially near end of the 90-minute cycle.
Selecting a Remote-Capable System
Confirm the host unit explicitly supports remote load and that its remote capacity (in watts) covers your plan (host’s own lamps + all remote heads) for the full 90-minute emergency duration.
Voltage: 6V vs 12V
- Match voltages exactly: 6V heads to 6V hosts, 12V heads to 12V hosts—never mix.
- 6V: Good for short runs and small loads.
- 12V: Better for longer runs and higher total wattage (lower current, less voltage drop).
Wattage & Battery Capacity
Add up the host’s lamp wattage and all remote heads. Stay within the host’s rated watts for 90 minutes—and leave 10–20% margin for aging and temperature. If you exceed capacity, upgrade the host or reduce heads/wattage.
Runtime Math — Quick Example: Host remote capacity = 36 W. Built-in lamps: 2 × 4 W = 8 W. Planned remotes: 4 × 4 W = 16 W. Total emergency load = 24 W. Required energy for 90 min = 24 W × 1.5 h = 36 Wh. Pass (meets host capacity with ~0% headroom) → Better: remove one 4 W remote or choose the next-size host to keep a 10–20% margin.
How Many Remote Heads?
There’s no universal count—only a wattage limit. Example: a 20 W remote capacity can feed five 4 W heads, or two 8 W heads plus one 4 W head, etc., provided 90-minute runtime is maintained.
Distance & Wiring
- Minimize run length: Place hosts centrally relative to heads.
- Size wire for drop: Long runs need thicker copper (e.g., 14/12 AWG). Keep voltage drop ≲ ~5% at end-of-line.
- Favor 12V for distance: Higher voltage tolerates longer runs with less loss.
- Test at 90 min: Verify furthest head is still bright at the end of the cycle.
Voltage-Drop — Rule of Thumb: Estimate current as I = P/V; for long runs, increase conductor size until calculated drop is about ≤5% at the farthest head.
Environment Ratings
- Indoor (dry): Standard thermoplastic heads.
- Damp/Wet: Sealed, listed heads (often polycarbonate or die-cast), gasketed lens, proper IP/NEMA rating.
- Cold weather: Consider heaters or locate host in conditioned space.
- Vandal-prone: Metal heads with tamper-resistant hardware; guards as needed.
Remote-head load and wiring checklist
Treat the host, heads, and wiring as one system.
| Check | What to verify | Why it matters |
|---|---|---|
| Host output voltage | Match 6V, 12V, or 24V DC. | Prevents mismatch and weak output. |
| Remote watt budget | Add every remote head watt. | The host carries the whole load. |
| Head wattage and count | Confirm lamp type, beam, and watts. | Small changes multiply across heads. |
| Wire distance and gauge | Measure one-way distance to the farthest head. | Long runs need lower resistance. |
| Voltage drop | Check farthest-head voltage under load. | Often the hidden limiter. |
| Environment rating | Match dry, damp, wet, cold, or hazardous locations. | Ratings follow the space. |
| Commissioning test | Charge, aim, run, and document. | Confirms the installed layout. |
Featured Products (Host + Head Pairing)
High-Performance LED Emergency Light – Long Spacing, Remote-Capable
- Remote-capable host with high-lumen MR16 heads for wider spacing
- LiFePO4 battery, fast recharge; optional self-diagnostics
- Great for tall bays, long corridors, and large open areas
LED MR16 Remote Head (12V) – Wet-Location, IP65
- Sealed, weather-resistant remote head for exterior egress points
- 12V input for longer runs with lower current and less drop
- Pair with a 12V remote-capable host sized for total remote load
Installation Tips
- Host placement: Accessible for testing/battery swaps; status LED and test button visible.
- Labeling: Mark remote circuits and junctions for future service.
- Aim precisely: Overlap beams to eliminate dark spots; document aiming angles.
- Circuit supervision (if available): Choose hosts that flag remote-circuit faults.
- Maintenance: Include remote heads in monthly/annual test routes; clean lenses; re-aim if bumped.
Where remote heads fit best
| Location | Best remote-head use | Watch-out | Recommended next step |
|---|---|---|---|
| Corridor turn | Light around a corner. | Aim for overlap. | Shop remote heads |
| Stair landing | Cover switchbacks and doors. | Watch glare on treads. | Review egress lighting |
| Exterior exit door | Feed wet-rated heads from a protected host. | Check rating and voltage drop. | Choose a host unit |
| Equipment room | Reach panels or shutdown paths. | Avoid impact and heat. | Check UL 924 context |
| Warehouse aisle | Target aisle ends or cross-aisles. | Height may need more output. | Compare high-output options |
| Finished lobby or theater | Keep batteries out of view. | Coordinate aiming and finishes. | Review concealed lighting |
| Loading dock | Cover dock doors and path changes. | Moisture and impact matter. | Compare remote heads |
Application Walkthroughs
🏭 Warehouse (High Ceilings)
Mount a 12V, high-capacity host at service height by the maintenance room. Run low-voltage circuits to multiple LED remote heads mounted high at aisle ends and over receiving. One battery powers all heads; servicing stays ground-level.
🏢 Office Corridor (L-Shaped)
Place a compact host in the floor’s electrical closet; locate small ceiling remote heads at both corridor ends. In outage, the host powers its own lamps and both remotes—clean look, full coverage, one battery to maintain.
🎭 Auditorium (Discreet Aesthetics)
Hide a high-output unit backstage. Feed low-profile or recessed remote heads aimed at aisles and exits. No bulky boxes in view; one source supports distributed heads throughout the venue.
Related Fire Code Guides
From the Fire code guide series:
Related installation note: Remote-head layouts still depend on fixture height and aiming, so use the emergency light spacing and mounting guide when placing heads.
International spec note: Remote-head layouts on export projects should be checked against international emergency light voltage and runtime requirements.
Remote-head sizing note: If the host fixture is an exit sign combo, size the remote load with the remote-capable combo watt-budget guide.
Related remote-head planning guide: When the host is an EXIT sign or combo unit, use the remote-capable exit sign planning guide to match voltage, watt budget, wire distance, and remote-head placement.
Combo requirement note: Remote heads may pair with combo units, but the format decision starts with when combo units are required.
Related high-lumen combo note: If remote heads are being used to extend coverage, compare high-lumen exit sign combo spacing before deciding whether one host fixture can cover the layout.
Beam selection note: For fixture-style selection, compare the MR16 vs PAR36 remote heads beam guide before final spacing and aiming.
Remote-head planning tools: 12V vs 24V · 3.6V Planning · Wire Gauge Tables · Spacing Guide · Stairwell Layouts · Outdoor IP65 · Hazardous C1D2
After checking spacing and wiring, use the remote head compatibility matrix to match each head to the host voltage, spare watts, and environment rating.
FAQ
Can any emergency light power remote heads?
No. You need a unit explicitly designed for external load. Look for “remote capacity” or “remote-capable” in the specs.
How many remote heads can one unit support?
As many as the wattage allows while maintaining 90-minute runtime. Sum the host lamps + all remotes and stay within the host’s rated watts (leave margin).
How far can I place a remote head from the host?
It depends on voltage, load, and wire gauge. Longer runs need thicker wire; 12V handles distance better than 6V. Verify brightness at the furthest head after 90 minutes.
Can I mix 6V and 12V heads on the same system?
No. Voltages must match the host exactly. Never mix 6V and 12V on one circuit.
Are remote heads allowed outdoors?
Yes—use wet-location listed heads and appropriate wiring. Many teams feed exterior heads from an interior host to protect the battery.
Related core guide: Remote-head layouts should start with the egress lighting requirements, then confirm voltage, wattage, and aiming for each remote location.
Remote heads are one fixture family inside the larger types of emergency lighting decision, alongside high-output, recessed, wet-location, and self-testing options.