Only issue with tactical headlight can be runtime. That being said, my Terralux 220 serves me well on the unlit MUP when the days get shorter. It runs on 2 AA batteries, and my rechargeables give me a little more than an hour of run time. If you kept four batteries charged all the time, it should be enough to get you through two dark commutes of an hour or so in length. I got the flashlight for under $30 incl. shipping from an eBay store. I mount it on a TwoFish LockBlock. I use a flashing PB front blinkie in addition for a little extra "be seen" protection.

If my flashlight dies, I may look into a MagicShine or a MiNewt, but for now I'm happy with my flashlight.