BradyGlo™ High Performance Photoluminescent "Glow-in-the-Dark" Exit Signs are non-radioactive, non-electrical, conserve energy and require no wiring or batteries. These safety signs are visible in total blackout or heavy smoke conditions and do not require any additional electricity to operate - which saves on energy cost. Photoluminescent exit signs have the ability to earn LEED points with energy efficient products and are also compliant with all current building codes (2009 IBC, NFPA 101). Additionally, glow in the dark exit signs are easy to install, low in cost and has a 25+ year life expectancy.