On my AM commute currently as now it's in the dark, it seems there are not a few riders who (self-righteously) overdo the lights to the detriment of oncoming riders, but that's another topic.

That sure rings true. There are times I wonder if people know that their lights have more than one setting and that on a dark bike path, all they are doing by leaving them on the MAX setting is ruining their night vision. Some of those 1000+ lumen lights are ridiculously bright for someone rolling along at 15 miles an hour or so.

One of the nice things about a helmet light is the ability to have something bright enough to see where you are going, but narrow enough to point out of someone's eyes when they are approaching.