In the dark

[Texas Red]

Government standards measure the headlight adjustment at a point only twenty five feet in front of the car, and allow a tolerance of about four inches in any direction from center.

However, a four inch vertical error at 25 feet becomes a four foot vertical error at 300 feet in front of the car. I've heard that 300 feet is considered the critical point of illumination. You should be able to clearly see a man, an animal or a parked car at 300 feet. Aimed just four inches low at 25 feet and you loose about 50 percent of your illumination and four inches high can blind on-coming drivers.

Vehicle inspection locations should be able to check it for a few bucks.

Jim
Red H2 in Texas