I don't own a car, so my commute bike gets ridden in all sorts of conditions, day and night. My lighting setup consists primarily of a Schmidt dynohub driving a Supernova 161 headlight which is mounted mid-fork, and a 161T taillight. These are on the bike all the time, and are on all the time (if I am rolling, they are on). The headlight gives me plenty of light to see the road in front of me at the speeds that I ride at night (~15ish). In the winter, when I am riding in the dark more often than not, I add to that a Dinotte tail light. In blinking mode, I have to recharge the tail light once a week.