When I grew up we had a heap of rules for bicycle lighting drilled into us (ok not that badly but I remember them for the most part), one of them was the angle

When I grew up we had a heap of rules for bicycle lighting drilled into us (ok not that badly but I remember them for the most part), one of them was the angle of your headlight should be at xyz to not blind other traffic. And that was in the time of bulb lights and dynamos so the lights would've been a lot more gentle anyway. Since then they've slacked the rules by a lot due to the sheer amount of decrepit and new/modern bikes on the road that didn't conform, so now instead of a red rear light and a white section on your rear fender, a shitty 1 euro LED light strapped to the back of your backpack or package carrier is apparently enough. And LED front lights are a thing, often aimed straight ahead for visibility / being able to see further than three meters ahead of you. I mean I'm guilty myself, got myself a new bike a few years back that has a headlight built into the frame etc.