Headlight control module provides an automatic high beam which is beneficial for driving, particularly on highways. It functions by automatically switching between high beam and low beam, based on traffic oncoming from the opposite direction.
Not only has the price of a single headlight skyrocketed but buying a new or used headlight for the latest vehicles have to be programmed. Gone are the days where you could just buy a headlight & have it simply fitted. Latest adaptive matrix headlights for Mercedes, BMW & Audi have to be coded before it can function properly on the car.