LED lights are so bright now they need to develop technology to keep from blinding oncoming drivers. I only put my dual P7 flashlights on high beam when I am on a rural street because of this.

100 lumens is a little too dim for my eyes at 20+ MPH, so I rock more like 800 lumens at full blast and maybe 400 on the busy streets. This costs me approx. $100 to do.