I carry a Fenix LD01 on my keyring; it is the closest at hand, and probably gets used the most. I use a Princeton Tec EOS headlight (two, in fact)when biking or hiking. I also carry a Gerber Ultra Infinity - very compact, with long run time.

I also EDC spare batteries for the Fenix and Gerber; with that supplement, either can last an all night hike, if it came to that.
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Geezer in Chief