I felt safer, i.e. drivers gave me more room when passing, when I was using my Down Low Glow. I have an abundance of lights on my bike. Some of my co-workers crack jokes about my being lit up like a UFO or a Christmas tree. I'm all ok with that.
I want drivers to notice that there is something there, even if it is a second or two, before they realize that it is just a crazy guy on a bicycle.