The H4 car bulb is used for headlights, it contains two filaments, and you can choose a high beam and low beam in one bulb.... moreThe H4 car bulb is used for headlights, it contains two filaments, and you can choose a high beam and low beam in one bulb. So if your car is suitable for H4, you only need one set of bulbs to achieve the effect of high beam and low beam.
So far, a variety of H4 car bulb head products have appeared in the HID market. Through market research, analysis, and... moreSo far, a variety of H4 car bulb head products have appeared in the HID market. Through market research, analysis, and exchanges and discussions with peers, it is concluded that these products have their own advantages and disadvantages.