Does a white front light make difference in broad daylight? I tried a couple of times with a strobbing one in bright daylight, and I doubt it made difference, as the daylight is so bright, so I turned it off. I use an amber light in the rear during the day.
I find that cars are much less likely to pull out in front of me during the daytime if I run a flashing front light. I also find that cars generally give me more room when passing when I have rear lights.