I have two with me most of the time, a little key chain light that supplanted the ARC AAA, it is a Fenix LOP and work with one AAA battery.
The second one in my pants pockets or sometimes in the holster is a Fenix L1P that works with one AA battery. This light suplanted my other EDC that was a Nuwaii Q III and worked on one 123 battery.
My EDC's of the last few years, the present one is the Fenix L1P
I don't do it to often now, (I am retired) but when I take a pistol out of the house the companion flashlight is a Surefire Centurion C-3 with the HOLA lamp, the P-91 (200 lumens for 20 minutes)
Here it is next to the Streamlight TL-3, both with the Tiger Rings (or Gabe Suarez rings) these rings are home made of rubber rings or hair tie, if you haven't exchange the lanyards for those rings, you will after you have tried them.
And for real blinding lumens I have in my house and in the cars the MAG 951 II for 1050 lumens (residing in the floor under the seat) and in the glove compartment the shorter 10" Black Bear 678 light (720 lumens)
And in the house they are alway next to my Colt Gov't .45 with Laser grips.
All the lights that I have in use (except for the Surefire Centurion III) work on Nimhs AA rechargeables, or in the case of the Fenix LOP in AAA rechargeables.
I haven't spend a dime in alkalines in two years, everything that I have (two way radios, GPS, Laser Rangefinder, camera, remotes etc) works with the Nimhs rechargeables, even the MAG 951 and 678 lights.
It is a good feeling of "no guilt" on spending money in alkalines and have the fringe benefits of not polluting another landfill with them.
Respectfully
black bear