The automotive lighting industry is driven by people who flood everything with brighter and brighter lights. All this does is make everyone's irises contract, and now anything that isn't at maximum brightness can't be seen. The cure? Well, the dumba##%%es conclude that MORE LIGHT must be the cure. Thus you get into the arms race of automotive lighting.

So now we can see fine bombing down a back road at 2 in the morning with no moon, but you can't see the freaking curb at the corner of your street because of the flaming retina-destroyers coming at you.

1. Type 2 or 2A Lights—Upper beam limited to 20,000 to 75,000 candela per lamp. Lower beam limited to 15,000 to 20,000 candela per lamp.

2. Type 1 or 1A Lights—Upper beam limited to 18,000 to 60,000 candela per lamp.  

But aftermarket LED headlights don't have a low/high beam switch.  The bulbs are rated in lumens which can't be easily converted to candela unless you know the cone angle.

Does the aftermarket LED headlight comply with FMVSS No. 108 in regards to proper low-beam lamp aiming?  If headlights are blinding you, it's likely because they are not positioned properly.

There are many DIY headlight adjustment videos but you need at least 25 feet level ground and a wall. Going to a place to have it done for you is no guarantee of a decent job.

Of course this is only in regards to aftermarket LED conversion on older cars. 

Some newer cars have adaptive headlights with a self-leveling system. A sensor determines if the car is tilted forward or back. Driving over a bump, as the front of the car lifts up, electric servomotors in the headlights react to the level sensors and keep the headlights aimed down at the road.

Only the BMW i8 has laser headlights.