Universal H4 9003 Bi-Xenon 6000K HID Bulbs Pair (GTR.N.006)Description Inserting HID bulbs into halogen designed H4 bases requires extreme accuracy. Each GTRLighting H4 HID bulb is laser aligned into its base so that the focal point of the HID bulb precisely matches the focal point position of the H4 halogen bulb, ensuring optically correct beam patterns. When you plan on installing this H4 HID bulb into your vehicle's fog lights, you can be certain that light is going to go where it's meant to be! Ultra HID