I remember that the French always had traditional yellow lights in their cars up to mid, late 1980's.
Somehow that tradition has gone now. I was back in France in 1999 and most vehicles have now white lights instead of yellow.
If I could buy yellow headlight bulbs here in NZ I would fit them tomorrow.
I used them in The Netherlands in my cars I drove there and think they are great. The human eye is more sensitive to yellow anyway.
Also a lot easier in misty conditions too.
While travelling in Europe in "the old days" 9 out of 10 cars with yellow lights were French cars, as young kids on holidays we always counted them and looked at their numberplates [Linked Image]

The product of rotation, excitation and flux produces electricty.