ACDelco GM Original Equipment Headlight Bulbs illuminate the roadway in front of your vehicle during low light conditions and are GM-recommended replacements for your vehicle's original components. Different technologies are used in headlight bulbs; the most common include Halogen and Xenon. Halogen bulbs give off a characteristic yellow/white color. Xenon bulbs give off a characteristic blue/white color. These original equipment headlight bulbs have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.