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The term “unfiltered fluorescent illumination” is required on the sign face of all photoluminescent exit signs. What does it mean?

April 26, 2017Face fluorescent photoluminescent signs term

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The term “unfiltered fluorescent illumination” is required on the sign face of all photoluminescent exit signs. What does it mean?

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This term refers to certain fluorescent fixtures that utilize an actual filter to reduce the amount of UV that is emitted from the fluorescent bulbs. The diffuser or semi-transparent panel that is most commonly used with fluorescent fixtures is NOT considered to be a filter.