When all lights are out, Permalight photoluminescent signs and markings high-performance glow in the dark. The glow material absorbs ambient lighting and emits its yellow glow at night and during emergency power outages. Safety glow products include directional arrows, EXIT and fire safety signage, anti-slip floor markings, metal discs, obstacle markings, wall-/corner guards and more. For more information call (888) 737-6254 or visit www.AmericanPermalight.com.