Tesla is ordered to fix nearly 20,000 cars with ultra-bright headlights.

Some cars have brightness levels that exceed the maximum allowable range by nearly double.

The automaker tried to argue that the impact to safety was "inconsequential," but NHTSA wasn't having it.

If you've driven at night in the last few years, you've probably passed an oncoming car and had the same thought at least once: There's no way those headlights are legal.

Sometimes they belong to a lifted pickup that managed to perfectly align its headlights with your retinas, or other times it's a car with aftermarket LED bulbs stuffed into a reflector housing. And if it isn't one of those, there's a good chance that it's a Tesla—which is why the EV maker is now in the spotlight of federal regulators.