I run a Dereelight when I am in uniform. Will alternate to a Sf Z2 or E2D once in awhile but the Deree is stout, takes rechargeable 18650 and have served me well since I got it 4 years ago.
For plainclothes I am still searching, just got a 5.11 A1 that runs on AA. I am waiting on SF to release the V1 which will allow me to have an IR and visible light in a small package that can be slipped into a pocket. until than the 5.11 A1 is doing nicely.