| 摘要 |
A sign for indicating an egress from a room is provided. The sign comprises a non-transparent substrate having a front planar surface and an afterglow photo-luminescent material on the front planar surface. At least one light source adjacent the substrate shines on the front planar surface of the substrate and the photo-luminescent material for charging the photo-luminescent material wherein the light source is a light emitting diode (L.E.D.) emitter and wherein the L.E.D. emitters emit light from the front or side to charge the afterglow photo-luminescent material.
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