I never ride at night because:
1. I don't need to
2. Too many things out of my control, deer drunks etc.
That said, I only use amber (or yellow on my Ultra Classic) for irritation reasons. They show up in a sea of white daytime running lamps. Since changing to amber a few years ago, I have never had a car pull out in front of me for lack of being seen.
My front fender light is also amber and between that and the amber spot lights the blinkers detracted from a clean look because they were orange. I replace the lenses with clear and installed amber bulbs. The front end looks right now.
I will re-post this so you can see