Don't forget the degradation of eyesight that age brings. My night vision is not as good as it was a few years ago. I currently have a 15 watt halogen light, but have decided that I should probably shell out the bucks for an HID system. During the winter, I commute home every day in the dark and I just don't feel safe, especially when riding fast. Testosterone may be preventing me from riding slower. Hazards just come up too quick and oncoming headlights are a real problem.