I just figured out another advantage to having a headlamp on your helmet. You can use the strap at any point 360 degrees to put a flashing led light that clips on. You want side lighting? Just put one at 90 or 270 degrees on the strap of either side (based on the assumption that the front of the helmet is 0/360 degrees). I tried a 135 degree (or 225 depending on how you look at it) angle this morning which gave me some side view and some rear view. Approaching a busy intersection it might even be better to have it at 45/315.