49 CFR §193.2911
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Where security warning systems are not provided for security monitoring under § 193.2913, the area around the facilities listed under § 193.2905(a) and each protective enclosure must be illuminated with a minimum in service lighting intensity of not less than 2.2 lux (0.2 ft c) between sunset and sunrise.