Headlights are regulated and tested by brightness, not power consumption, so it’s already what you suggest. The problem is brightness is tested using a few very standardized tests.

LED arrays make it easier to engineer uneven brightness throughout the area of the light beam, e.g., dimmer in the middle than the outside, dimmer on the left sides, etc. This means manufacturers can make headlights that are overall brighter than allowed but can still pass tests as the region tested by regulators is designed to be dimmer, so the test results are acceptable.

I just looked, it’s fake. I still stand by my song.

Smoke meth in the city where the heat is on
Fight manatees on the beach 'til the break of dawn
Welcome to Miami
Bienvenidos a Miami

You can run Doom on just about anything.