Glo Brite Eco exit signs are designed to glow in total darkness, these photoluminescent signs absorb and store energy from ambient flourescent light. When properly charged Glo Brite signs are immediately visible in the event of a sudden blackout situation. Designed for wall, ceiling, flag and conduit stub mounting. 50' viewing distance. 8 5/8" x 15 7/8" x 3/8". Plastic frame. Meets the following standards: NFPA 101, 2009 IBC and 2009 IFC.