I actually got a chance to play with a PB Blaze the other day at an REI. I can't believe that in this day and age people pay money for such a horribly underpowered light. I honestly wouldn't give you $10 for one.
IMO, an 18650 based flashlight up front, a Cygolite Hotshot in the back. About $75 total including 2 batteries and charger.
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Work: the 8 hours that separates bike rides.