I have http://www.shiningbeam.com/servlet/t...sh-G-R5/Detail on my helmet. I have another flashlight on the bars. The bar light has a wider beam. For me, the ideal helmet light is lightweight and is under 4" long and under 1" diameter. I like a bright helmet light so that I can shine it anywhere I want, including edges of the MUP where critters are waiting, down side streets, around tighter corners. I reject any light with an external battery pack. Flashlights that use 18650 batteries are the brighest flashlights. OK. I guess people have started using 26650 lights, but I find them a bit larger than I prefer.