I was deployed to Iraq a couple years ago. I carried my Surefire M6 (500 lumens) while working on the flight line at night. It worked very well has a spotlight for moving aircraft at night.
Sometime, on a night with no ambient light, no moon, etc. we would go out on the flight line and play a game I called "touch Joe". It basically consisted of me with my Surefire blinding my opponent and evading them, while their goal was simply to touch me. I could often keep them from finding me for minutes at a time. I would hit them in the eyes with the light, then sidestep and slink away while they flail around trying to find me. After 5 seconds or so they would be able to see good enough to see me and charge, in which I would blind them again and duck and sidestep.
Good fun, and yes, we were very bored sometimes.
I usually carry my Surefire LX2 everyday. 15 lumens on low and 200 on high. Very nice light. Push the tailcap a little for low power, push it harder for high. Very easy to use. Doubles for a self defense light, and a work light when working on helicopters.