Several nights a week I won't finish work before 9:00pm, which puts me on the roads and bike paths sometimes till 10:30pm. Driving during the day is reasonably uneventful unless I hit rush hour - driving after dark can be a problem. Most of the issues are pedestrians and other cyclists wearing no reflective clothing and out with no lights or reflectors. Other complications can be stormy weather (like today) that reduces visibility and can leave the bike paths littered with branches - ocassionally some fair sized ones.

I run about 1,500 lumens up front during the day and about 500 in the back. At night I can bump that front lighting up progressively to about 5,000 lumens. Sounds like a lot, but black pavement and heavy rain eats up light surprisingly well.