1、Check the bulb, pay attention to the bulb,whether work well, if you found black color inside, you  should change in time. How to change bulb? Follow the directions, select suit bulb

 

 

2、Check the car lampshade whether craze, if craze, while driving ,rain is easy to get in, then not bright, also make circuit plug corrosion, rust, damage.

 

 

3、Adjust the lamp, if necessary, the owner can use a screwdriver to adjust the heights. Generally speaking, HID headlights should be completely level straight. Can't adjusting too high, in order to case to  direct opposite car drivers eyes. except height, width of light also can adjust, even in very low visibility of rain and fog, make suer clearly to see the road.