How long will GLOWSCAPE photoluminescent signs and egress path markings glow without ambient light?
Yehoshua Perlstein
Underwriters Laboratory Standard UL 924 and UL 1994, the International Building & Fire Code, and NFPA 101 Life Safety Code, all require that photoluminescent signs and egress path markings be visible and legible for a minimum of 90 minutes after ambient light has been removed. Practically speaking, Glowscape products will glow for hours afterward.