The illumination component of is an important factor for the effective operation of photoluminescent exit signs. To specify the minimum illumination, luminance and duration for the performance of a photoluminescent exit sign. the brightness of that charging light and.the type of light that is being used to 'charge' the photoluminescent material.the properties of the photoluminescent material itself.The brightness and the time of the useful glow depend on: It is this feature which makes the material glow for a longer time after normal lighting is removed. For ordinary phosphors the time delay is normally measured in fractions of a second, whereas with photoluminescent materials the delay ranges from fractions of a second through to hours and even days. Another term used instead of photoluminescence is 'long afterglow phosphorescence', because the only difference between a phosphor, as used on the surface of many electrical lamps and a photoluminescent material, is the time delay between receiving incident radiation and the emission of the useful light. Photoluminescence is the ability of a material to absorb light and UV rays, and re-emit visible light for a period after the source light has been removed. To clarify that provides the design and installation details for photoluminescent exit signs.
