My one suggestion with riding at night is to be careful with your speed, particularly on downhills and in poorly lit sections. Visibility is substantially reduced (even with substantial lights) and it's much hard to avoid debris and the like. I have a half-mile long descent on the way home where I can easily hit 25-30 mph. I always keep my speed around 15-20 when riding home in the dark because you never know what's coming up.