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These glow-in-the-dark adhesive tapes are energized by a long-lived photo-luminescent mineral . They charge fully with only 10 minutes exposure to light. Any type of direct lighting will charge them. Sunlight, halogen, xenon, full spectrum & fluorescent light work best. Glow lifespan is measured to the point of bare visibility to the darkness-adapted eye, but may vary due to a) proximity to charging light source, b) angle of exposure to source, and c) brightness of source lamp. Photoluminescent tape is used in areas such as egress and exit pathways, stairwells, evacuation corridors, emergency exits, as long as they are lit well enough to charge the tape. Photoluminescent is used on handrails in stairwells, across steps, and around exit doorways. Photoluminescent tape can be used to mark instruments, switches, controls; anything important to see when the lights go out.