Originally Posted by
R. D.
...
I believe German rules are the most advanced for bike lights, but I don't know what exactly is required, except that the lights must be approved (?) maybe someone on this forum lives there?
I have never been there, do not know the rules. But some of my lights meet their requirements. The are constant on, no flashing. Headlight lights up the ground in front of you, not shining into the eyes of oncoming traffic. I think the headlight also has to have a small amount of light directly to both sides, at least my lights do that.
That is a summary of my observations about the German lights I have on my bikes.