The problem isn't LEDs though. The technology isn't what's making it bright.
The regulation needs to be specific about what they want the end result to be, not about the specific technology used.
Like: there should be a mode of operation where oncoming traffic at x distance, seated at y height, on level roads should not experience more than z brightness.
I think it is LED technology. LEDs have a very small bandwidth. Even white leds are just three very small small bandwidth emissions.
The very tight intensity in such a small bandwidth is hard on the eyes. Even when compared with the same power of older lighting technology, which has a comparatively massive bandwidth.
LEDs could be designed to compensate for this better. They could add more different colours of LEDs to the matrix that makes up white LEDs.
Maybe you need to get your eyes checked. I rarely get blinded on the road in Germany, and when I do it's almost always someone who just forgot to turn off his high-beams. Active matrix headlights are very common here nowadays and never blind me
This is why regulations should be about the behavior they want to see and not the technology used.
The goal is not to blind drivers; companies should be able to use whatever tech they want, but they should get fined every time their tech doesn't work as expected in the real world.
If we won't regulate guns despite school shootings, what hope is there to regulate cars? (Unless someone rich can get a cut?) Apparently someone else's freedumb to do dangerous things is my own freedom to stfu:-(.
All Praise and Honor be to our glorious Electoral College, may it forever prevent us from making dumb decisions such as "preventing needless deaths".
Oh, yeah, of course it is not going to happen in the US. Force a pickup truck to aim their lights at the road instead of other drivers' eyes? Political suicide. But I'd still like it to be regulated.