I drive quite a bit, and my car sits at about an average height from the ground. What this means is that lifted pickup trucks and larger SUVs will have their headlight directly facing my rearview mirror, and the number of times I have almost gotten into an accident because of RESIDUAL blindness due to the incredibly bright headlights is not something I am happy about.
This is easy to regulate, just have some reasonable lumen threshold for the manufacturers to abide by, and put some crazy penalty on those who choose to break that law. Like 25k$ for each infraction. Watch how many lives you save.