It sounds like a practical idea. My rack mounted blinky in the rear is so bright, that on 2 occasions, drivers stopped ahead of me at stores or restaurant and waited for me just to stop me and ask what kind of light it is and that they saw me a mile away. One additional blinky on my helmet may be a good thing to have though. I also think like, cyccommute mentioned above, 2 lights on the bars is a very good idea. I am planning on getting an additional Nightrider light for my bars.