I am surprised the Thrunite TN4A HI was only recommended a few times when the topic is multi AA thrower, would have thought at least 50% of replies would be TN4A HI. They should be. The quality and performance for the price is just incredible. It is my favorite light.
Have a look at PD68’s review: PD68 Review: Thrunite TN4A HI - 4*AA Light
It is 1.7 inch in diameter. You’re not going to get a multi (more than 2) AA thrower in 1 inch in diameter. But it is still a very compact light and feels just right in the hand, once he sees the performance I have no doubt he will love it. These 4x AA lights are not “Soda Can” in my opinion, I think people see pics of them and without a size reference they think they are like the 4x 18650 just because the shape, but in fact they are much, much smaller, no where near soda can.
Here it is in PD’s hand:
Also very simple and intuitive UI that any non light person can use.
Buy some L91 batteries for him and he’s set.
It comes in cool white, and is USD $49.95
http://www.thrunite.com/thrunite-tn4a-xp-l-hi-max-1050-lumen-flashlight/
Buy it and don’t think twice.