So you have a building where its a pain to get electric wiring to but you need an Exit sign no problem they make self illuminating exit signs which glow in the dark after you charge them up with light.
most are safe to use and handle.
How Ever be careful how you handle and dispose of them as they may contain a Radioactive element known as Tritium a naturally occurring Isotope of hydrogen
https://en.wikipedia.org/wiki/Tritium
https://www.selfluminousexitsign.com/collections/tritium-exit-signs
The Tritium is contained in small glass tubes within the sign
In some areas it requires special handling to dispose of these signs specifically if more than one.
check with your local disposal service for any requirements they would have .
These signs have warning labels on them that they have a radioactive element in them.
Normally these signs can stay working for up to 10 or more years as long as they are kept charged up.
and are perfectly safe when used in a proper manner.
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