One of the major requirements of an illuminated exit sign is it has to keep glowing ... It’s what’s powering the green glow of emergency exit lights. Tritium decays when one of its neutrons ...

"A concrete block shed with steel roof trusses and corrugated iron roof, built to hold 60 pigs in four pens, had to have a fire hose, an illuminated "EXIT" sign above each of the two doors and an ...

Luminance distribution and contrast measurements are of key importance in the verification of internally illuminated emergency exit signs in compliance with the IEC/EN 60598 series standard.