There's several unpowered sheds on our rural property and I use the $5 head torches with 3 AAAs if poking around in them after dark or out walking the dogs.
I also use one of these for lighting up specific areas. This one fell and cracked but still works. I bought a couple from Ikea quite a few years ago. You can stick them on any metal surface. You just push on the lens.
Worked quite well on it's own but the detector light with it's ring of LEDs does a better job of overall lighting of the interior and I use this as a handy mobile light within the shed itself.
