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For urban exploring I use a Lenser P7, pretty much perfect for it, as well as general use. I also carry an 1800lm cree torch that runs on 18650s, a cree Q5 that stays in my coat pocket wherever I go, and a 1600lm head torch which is mainly for cycling.
Pic related, the P7 and a 30 second exposure in a tunnel that was bloody hard to light.