Specifier Tool
Coverage Estimator
Back-of-envelope sizing across any number of zones. Pick space types, set runtime and voltage, compare central-battery vs. unit-equipment architectures, and push the whole stack into a submittal in one click.
For final stamped design, run the .ies files through AGi32, DIALux, or Visual.
System settings
90 min (NFPA base)
277 VAC
Zone 1 of 1
Project Summary
3
Luminaires
1
Exit signs
3,000
Sq ft
~26W
Emergency load
90 min
Runtime
277 VAC
Voltage
Unit Eq.
Architecture
Estimated egress footcandles
Meets NFPA 1 fc avg
1.00
fc avg
0 fcNFPA 1 fc2+ fc
Architecture comparison
Chosen: Unit eq.
Upfront cost index
Relative, not $
Central
9.6
Unit eq.
4
20-year cost index (w/ battery replacement)
Relative, not $
Central
14.1
Unit eq.
11.2
Recommendation: At this scale, unit-equipment (BB) fixtures are simpler and cheaper. Central battery infrastructure is overkill for a small count. Read the full CB-vs-UE breakdown.
Emergency Luminaire
PhoenixPHO
3units
Architectural recessed downlight — most common Sage choice for corridor emergency egress.
Spacing: ~50 ft
- 4" recessed downlight. 1 fc avg at ~50 ft spacing @ 9 ft ceiling.
- Est. egress path: ~1 fc avg (NFPA minimum: 1 fc avg / 0.1 fc min)
Exit Sign
OpaliteOPA
1unit
Aggregated across 1 zone. Crystal surface mount — universal application.
Spacing: ~100 ft
- Per NFPA 101: exit signs visible from all points along the egress path. Add more if visibility is obstructed.
Engineering notes
- Unit-equipment (BB) selected. Every fixture ships with integral battery. No central wiring needed, but per-fixture NFPA self-tests must be run manually.
- Worst-zone estimated egress path: ~1 fc average. NFPA minimum: 1 fc avg / 0.1 fc min.
Disclaimer: This estimator uses industry-standard rules-of-thumb at typical mounting heights. The footcandle estimate is directional \u2014 for code-compliant final design, run a photometric calculation in AGi32 or DIALux using the .ies files on each product page.