I recently got one of those "night vision" red flashlights for deer hunting and have been trying it out. ...and one thing I thought to do is strap it to my bike as a tail light. ...but I haven't rode with it yet. Partly because it's 2000 lumens for the equivalent white model, and turned down to low, it is still plenty bright enough to dazzle me as I look at it from about 20 meters back. With that in mind, about how bright for a high power red LED tail light would you say is too much, such that I begin to dazzle motorists when riding of a night?