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YEP !
That is them !
Supposed to be for zippers!
Much more useful on tent ropes etc (and black viewing chairs) that get tripped over in the dark.
They last pretty much all viewing night, but do get duller as it progesses.
They need daylight to recharge as I recall.
I haven't seen them in other forms but I am sure they do.
Not sure about the lead undies bit.
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