All modern cars will have a knob on the car dashboard that lets you adjust the high beam light level. What this knob will do is to adjust the angle of the light bulb or mirror enclosure, thereby altering the direction the light falls. By default, the light will be pointing slightly downward towards the road. This is the recommended setting if you are riding on a normal paved road at normal speeds. Lifting the beam will generally increase the range of the bulb. That means you will be able to see objects farther in front of you.