Put simply, photoluminescent signs are signs which “glow in the dark”. Once darkness falls, they glow. This makes them easy to see in the absence of light.

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However, these signs don’t glow by magic – there’s a science behind it all. Photoluminescent signs are illuminated by the action of photoluminescence. This occurs when energy in the form of light (i.e. photons) is absorbed from the surroundings. A special coating both absorbs and stores the energy. Once it gets dark, the stored energy is re-emitted as a luminous glow.