So 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. Faced with this analysis:

　　H4-1, this type of lamp head is called single light, single xenon, etc. It is characterized by the cheapest price, simple installation, and good condensing effect of single light; Adverse effects of driving and annual inspection;

　　H4-2, mono-ammonia mono-halogen, or a xenon-halogen lamp, its characteristics are that the price is similar to that of a single light, and the gas lamp has a better condensing effect. Ashamed, the installation is relatively simple; at the same time, since the service life of the halogen lamp is theoretically only 1/10 of that of the xenon lamp, the halogen lamp needs to be replaced frequently in use; on the other hand, when the halogen lamp is changed into a xenon lamp, because the xenon lamp The characteristic of the lamp being gradually brightened after a cold start (the start-up process is a complex process, divided into three stages: 1. The electrode releases free electrons, and the electrons are accelerated in the applied electric field; 2. The kinetic energy of the free electrons is converted into the excitation of gas atoms 3. The excitation energy is converted into light.), there will be a short-term loss of light, which will bring unsafe factors to driving;

　　H4-3, bi-xenon or double tube, is characterized by using two lamps to realize the change of far and low beams (high and low lamps), requiring four ballasts, so the price is the most expensive and the installation is more complicated. The lamps are all deviated from the optical axis, so the effects of far and near beams are not very ideal; when switching between far and near beams, due to the characteristics of xenon lamps that gradually become brighter after a cold start, there will be a short-term loss of light, which will bring trouble to driving. Safety factor; on the other hand, since the illuminants of the two lamps are too close, no matter which light is lit, it will affect the life of the other light, thereby shortening the service life and increasing the cost of use;

　　H4-4, lifting and shrinking lamp or both near and far beam light, uses a xenon lamp tube to stretch back and forth to change the position of its light-emitting point, so as to achieve the purpose of changing the light of far and near beams. Its characteristic is that the far and near beams are all xenon lamps. , The price is moderate, and there is no short-term loss of light when dimming.

　　Haining Suez Car Lights Co., Ltd. is a LED car headlights supplier, the main products are car LED bulbs and other products, welcome to inquire!