You flashlight nuts are funny.
10 to 1 if this guy gets anything fancier than whatever is at the drugstore or pepboys (hey its got 42 LEDs it must be bright! right?), he is going to buy at big box retailers. Fenix, Olight, Ra may be big names to you and me, but to this guy they are fringe boutique oddball with a high price.
The only answer you should give your buddy.
Inova X5.
Every Target, Walmart, Sporting goods store has it. The average $40 price will probably be more than 2x the most he ever paid for a light, but to us it is nothing. Sports Authority had them on sale last week for $25.
EVERY mechanic I know has one and swears by it. The really good mechanics also have another Inova with a UV beam to pick up the UV-trace additives to spot leaks, sources, and paths of various liquids.
The only thing he may balk at is the "expensive camera cell" for the battery. Just show him that he can buy a 2pk of SF CR123's at Lowes for $5 (not great, but for a non-flashlight guy, its a damn bargain vs the drugstore and electronics retailers)
Once he hear that the brightness is not affected by cold or by long periods of non-use, he will bite and who knows, maybe become a torch-nut fan like all of us.
You start talking multi-modes and outputs along with HA-III etc, hes just gonna get an LED mag or some cheap aluminum cluster light with 5 lumens total output, get spots in his eyes from looking directly at it, and say "hurr thats brite!)
A SF G2L would not be a terrible choice either, but there is an X5 in every toolbox these days. I know one of my friends got one of his from the Matco tools rep. Might be the UV light. I'd ask, but I don't go bringing up obscure flashlights with my friends out of the blue. Might as well ask them what type of steakknives they use.