i have 2 of the 3aa also...yes im a light junkie but i sell them to guys i start into predator hunting..
i have one that looks like the one being posted here, not as bright as the 18650 battery one.
I have another, its the all aluminium flashlight headlamp, its almost as bright...
BUT i think you will be alright because i mostly scan on medium and pick up eyes easy at 150 yards...
the zoomable flashlights are great also...the 18650 ones mount just the same any of the 3aaa are bigger than 1"