When it comes to the illuminance requirements for exit signs, all exit signs need to be evaluated on a level playing field. It's not as though smoke or fire near a doorway will choose to ease up because the exit sign above the door won't be bright enough for people to see. Not to mention, ambient lighting has an adverse effect on exit sign visibility, especially in smoke. Every exit sign needs to meet the illuminance requirements in UL 924! So why does the NFPA Read more [...]
The NEMA Emergency Lighting Section today published LSD-46 summarizing their concerns regarding advertising and performance claims of Photoluminescent Exit Signage. It may be found at http://www.nema.org/stds/lsd46.cfm and downloaded for free.