When I fought fires I just carried a Garrity light, last one I bought was a LED version. They were cheap and easy to replace when they fall off. Of course lights have come a big way since I retired.
Glock 22 (LWD .357 Sig barrel), Glock 27, Colt M4
Black Rifle Club member #224 Lone Star Glocker #134
NREMT-Paramedic TCCC Instructor