Photoluminescent exit signs use a special type of paint that glows in the dark, allowing the sign to be seen even if power sources such as electricity have been cut off. This is especially useful in emergency and hazardous situations where conventional lighting may not be available. Take a look at how photoluminescent exit signs work and can help keep everyone safe in an emergency. Visibility Photoluminescent exit signs are relied upon in emergency situations to provide visibility and direction.