In reply to:
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anyway these items will actually be on me, so what benefit would a small LED keychain light serve? Apart from finding a keyhole in the dark, they seem way too small to be of much use.
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Signalling, reading maps, attracting fish, and finding your way around your personal survival kit on a dark night
I own that exact light and it bright enough to do a lot more than that. It would (and has) lit hiking trails in the woods and stairwells in the office.