Not exactly related, but I had a moment a few days ago. I was riding just after dark and I saw a red blinking light approaching at what seemed like a ludicrous intercept speed, given my own moderate pace, and sitting on the wrong side of the road. It turned out to be a cyclist coming the other way with a red blinking light on his FRONT!

Yes, I saw him, so I guess mission accomplished, and he had a red blinkie on the back, too, but it definitely felt 'wrong' to have the red blinks on both ends. In particular, I would think this would be a very bad thing at intersections, where folks might think he was moving away from them when in fact he was moving towards them. Not all 'being seen' is good enough, or helpful, I think.