The performance of a photoluminescent component is measured primarily by brightness and the amount of time it produces light. The components require no electricity since they absorb energy from ambient light and re-emit it when the light is out.
Photoluminescent egress lighting typically glows in the dark to define a space or path so occupants can orient themselves and identify a safe route that avoids all obstacles. Today, photoluminescent egress lighting is being adopted more widely by facilities to help guide occupants in emergencies when there is little or no light.
Photoluminescent egress lighting has been used for years on planes, trains and ships to assist evacuations, particularly when power is out.