Egress Lighting Illuminance Compliance Check (NFPA 101 / IBC)
Egress illuminance against NFPA 101 / IBC: normal 1.0 fc avg / 0.1 fc min, emergency 90-min end 0.6 / 0.06, max/min <= 40:1. A 1.2/0.15/3.0 fc corridor is compliant; a 0.05 fc dark spot fails the emergency minimum even at a good average. The adopted code and AHJ govern.
Formula and source
normal: avg >= 1.0 fc, min >= 0.1 fc; emergency 90-min end: avg >= 0.6 fc, min >= 0.06 fc; max/min <= 40:1; pass = all.
The NFPA 101 Life Safety Code / IBC means-of-egress illumination requirements, by name.
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