I'm a minimalist when it comes to lighting night time activities. There is so much ambient light in the cities, that I try to rely on that as much as possible for seeing, and use my bike lights to make sure I am being seen. I generally have my headlight set to blinking for that reason. I take the same approach hiking, and even scuba diving, at night. If there is ambient light, either natural or created by all the heavily lighted people around me, I do my best to use that light, and to allow my eyes to adjust as fully as possible.