Thanks for the thoughtful comments and consideration. Bike headlights' lumens/dollar is quickly increasing. I see very little of your kind of consideration with light amongst "The Cyclists" I encounter, and see only problems as their lights' power increase. I'm a lighting professional, and a member of the International Dark Sky Association. People, in general, throw light around with total disregard for what, where or who it hits. Cyclists are no different. Some may eventually think that shining a laser beam toward oncomming drivers will be justified to "get their attention". Where do we draw the line?