Photoluminescent exit signs don’t require electricity when placed in a well-lit area. These signs are approved for distances ranging from 50 to 100 ft. and include vandal-resistant designs for mounting in public spaces. Photoluminescent signs have an estimated lifespan of 20+ years and do not require monthly testing because there are no bulbs or batteries to replace. These exit signs are environmentally friendly, giving off 0 emissions.

Not all environments are compatible with photoluminescent signs, so make sure the following NFPA guidelines can be followed before purchasing. In some cases, a dedicated light source may be required to charge the sign.

The face of a photoluminescent exit sign is illuminated by a suitable charging light source. The charging light source is controlled by authorized personnel and energized when the building is occupied. Exit signs are located in accordance with their viewing distance.

The biggest hurdle to adoption seems to be the occupancy requirement because the charging light needs to remain on while the janitorial staff cleans after hours or an employee works outside of standard operating hours. Depending on the light sources used to charge the signs and the number of photolumenescent signs in the building, it can require more electricity to keep the signs charging than it would to power LED exit signs instead.

When selecting an exit sign, you should also take the humidity of the environment into consideration. Emergency exit signs UL listed for “damp locations” have been approved for installation in areas where the light will be exposed to occasional condensation or moisture. This is important for gyms, medical facilities, and office buildings with an indoor pool.

Maintenance Requirements