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How Long do Active Safety Signs and Markers Glow for?

April 26, 2017active glow Markers safety signs

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How Long do Active Safety Signs and Markers Glow for?

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The length of time a product glows depends upon the length of time it was exposed to a charging light source. With a charge of 5 footcandles of light, UL [Underwriters Laboratories] requires exit signs that are listed to the UL-924 standard to glow at a minimum illumination level for 90 minutes after the charging light source is removed. Practically, with a few minutes of exposure to a charging light source, photoluminescent products will glow for hours afterward, gradually losing illumination intensity.