In a single AA flashlight, check out the FourSevens Quark Pro QPA. It's big for a single AA light, but the output has 0.2 lumens at the low end and 130 lumens at the high end with 5, 26 and 102 lumens in between.
BTW, since FourSevens has a 120 month warranty, why not contact them and see about that loose head on the AA mini.
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