The headlight bulb installed in the headlight is to lighten your road, especially at night, rainy day, snow day or foggy day. Headlight is not only a necessary auto part in your BMW, and it plays a crucial role when you are driving. It related closely to your safety. You have to give a sign by headlight to the car that runs either in front of you or behind you or even in reverse direction. What's more, people would like to give a sign by flashing headlight bulb that I am going to pass you instead of using horn. So if you find your headlight bulb doesn't work or it is dimming, for you and your family safety, change a new one as soon as possible. And you can find a good-performance product here since we provide you all BMW genuine OEM headlight bulb with a shocking low price.