Back lamp is used to warn adjacent vehicle operators and pedestrians of a vehicles rearward motion, and to provide illumination to the rear when backing up. Each vehicle must be equipped with one or two rear mounted, rear facing reversing backup lamps. They are usually white or yellow in color.
Back lamp lights are important safety features. They illuminate the scene when you’re backing up, which is important, but they also warn pedestrians and other rivers that you are about to back up. This is probably even more important than lightning the way for you.