I do the same thing (two head lights). From observing other cyclists I've decided that around here with the streetlights a steady headlight is fairly poor for being noticable to drivers, but a flashing one screams bike. In fact I have 2 flashies on each end. If anyone ever hits me in the dark, I didn't see her will be a poor excuse.... the Knogs I put on my messenger bag are so bright I'm always looking up to make sure low flying planes don't think I'm the runway at seatac....




). One was flashing and one was steady. I needed the steady one to see the ground, and the flashing one was so people would hopefully notice me. 
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