Pondering how much light I got for different battery types, I resorted to manufacturers published figures - for a given output, in lumens, how long would a light provide illumination, relative to its weight.
Bottom line - lithium ion batteries are considerably more efficient than AA, providing almost three times longer light.
I compared a Zebralight H53, with rechargeable batteries against a Zabralight H600, equipped with 18650 battery @3000mAh.
H53 provided 4.2 hours at 106 lumens, weighing 2.8 oz.
H600 provided 13.6 hours at 126 lumens weighing 3.3 oz.
I assume roughly comparable results at different lumen outputs.
I have both models and I like them equally - sturdy and dependable, but I can hike all night with the 600 - not the case with the 53.
Comments welcome...
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Geezer in Chief