For road models, headlights can be said to be an indispensable equipment. Although there will be some differences in details according to the configuration of the model or the design of the car factory, the specifications used are generally not far apart.
1. M5 (H6)
Commonly known as the small plate bulb, there are two models in terms of specifications. PHILIPS calls it M5, and OSRAM calls it H6. Because the base plate is smaller than other specifications, it is called a small plate. In addition, under the same specifications, there is also another design without a plate. The M5 (H6) bulb contains two sets of filaments, which is a common design for high and low lights.
Another specification of M5 (H6), the bottom contact is a convex point instead of a pin design.
Due to the small size and low wattage of the M5 (H6) bulb, the power is usually around 18 to 35 watts, and the relative temperature is low. Due to the limitations of early material technology, most models with plastic lamp shells use M5 (H6) bulbs. Depending on the exhaust volume and power generation capacity, one to three sets of M5 (H6) configurations will be used to obtain sufficient range of lighting. In recent years, many car manufacturers have replaced M5 (H6) with HS1, which has better lighting effects, and the market visibility of M5 (H6) has gradually decreased.
2.H4
Another mainstream specification on motorcycles is H4. H4 is obviously one size larger than M5 (H6), and the size of the panel is similar to other specifications. The panel itself has three lugs to determine the installation direction of the bulb. The bulb also contains two sets of filaments for high and low beams. The base of H4 is a three-pin foot position, which is the positive and negative poles of the high and low beams respectively, and is fixed to the vehicle power supply by plug.
H4 has three pins and three anti-fool lugs.
H4 bulbs have high wattage power (usually 55W/60W), and the lighting effect is much better than M5 (H6). Among the early domestic cars, the models with glass lampshades such as Yelang and FZ all use H4 specifications. With the advancement of material technology in recent years, plastic lamp housings can also have good high temperature tolerance. Therefore, many models with plastic lamp housings have adopted H4 lamp sets in recent years. Since H4 is also a common specification for cars and there are many bulbs to choose from, many car owners will change M5 (H6) lamps to H4 in exchange for better lighting effects.
