PERMALIGHT® photoluminescent safety signs remain visible to observers for an extended period of time during a blackout, underneath a heavy smoke layer or simply at night.
The luminance duration is determined by the quality of the PERMALIGHT® photoluminescent sign that you purchase (standard safety grade or higher performing power qualities), the type of ambient lighting at the installation site and the charging time. While color (e.g., red or green) cannot be perceived by the human eye over an extended period of time in full darkness (scotopic vision), the photoluminescent figures and graphics of the sign are obvious and very clear. This makes PERMALIGHT® photoluminescent signs more reliable and safer, compared to traditional non-photoluminescent signs.
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