Which AA / AAA Light ?

LED Flashlights – General Info
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My recomendation

http://dx.com/p/klarus-p2a-cree-xp-g-r5-20-240lm-2-mode-white-flashlight-black-2-x-aa-199026?r=43033281 (the lowest price I have seen)

Reviewed here Review: Klarus P2A - compared to JetBeam BA20