Ill start:

Left to right:

Streamlight stylus pro
Olight o’pen
4sevens preon p2
Inova xp nite ize

What I think classifies as a penlight? This is of course open for debate. Same size as a regular pen. At least 2 AAA batteries in length (doesn’t have to be AAA, just around that size) and fit into a pen pocket like so:

The Inova and streamlight struggled to get in there, but managed to fit.

So show us what you got!

I’m not a person, I’m a mass of incredibly well organised birds