The glow in the dark materials used to manufacture our tapes are non-toxic, and free from any phosphorous or radioactive material. Photoluminescent tape can take very little time to charge by absorbing artificial or natural light (approx. 2 hours) by the use of photons. In a lights out situation, Heskins glow in the dark tape emits a strong photoluminescent reaction that can illuminate stair nosings, door surrounds, walkways, stairways, skirting boards, entrance/exit ways and anywhere else that would require strong, electricity free illumination.