So since the gas prices have drop, Princeton Tech seems to want to keep them that way, introducing the Switchback 1 the smallest most powerful light. With lights like these coming on the market the only thing that will keep you from biking is yourself.
Burn time is 10 hours (of course on the lowest setting), that should get you to work and back and if not just charge up while at work. Working through all the setting on a ride will get you 5 hours, not bad. Hey is you are still doing the bike commute, training, riding the trails after 6 pm, this light will keep you out just a little longer and that is only a good thing. Put one of these on your holiday list.