PB 2W in flash will last 40 hours, probably more, with a set of Sanyo Eneloop AA, 2AH. I run it about 10 hours a week and I only deplete about 15-20% of the charge on my batteries. I charge my batteries every week on a Maha C9000.
Maybe something like a Niterider Minewt of some sort. I had the 250 lumen model and the flash will get a lot of attention. Don't run that strobe at night though because it's far too intense and not in a good way. I started getting vertigo as a result of the flashing light reflecting off the road and other objects.