PART NUMBER: 111081. Part Number 111081. Crystal Headlights. Bulb Type Halogen. Light Source Halogen Bulbs. The purpose of the lighting system of a motor vehicle is to provide illumination for the driver to operate the vehicle safely after dark, to increase the visibility of the vehicle, and to display information about the vehicle's presence, position, size, direction of travel, and driver's intentions regarding direction and speed of travel.