Check out the Nitecore LR12
1x18650 1000 lumens
Bit of a strange setup as it doesnt have switch - you turn the base on and off to get through from high to low and then back to high again.
The front extends so you have a lantern with a max runtime of 900hrs on 1 lumen but realistically you wouldn't use it below 60 lumens so around 24 hrs.
106mm x 27mm so quite compact.
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