How much does it cost to refit car headlights?

If the subject wants to know, "How much is the modification of car headlights?" The relevant contents are as follows:

The general cost of refitting a set of headlights is about 3000 yuan:

1, once again, people have made great efforts on the composition and structure of filament. The inventor introduced a new element-rhenium;

2. Rhenium has the advantages of high melting point, corrosion resistance, good mechanical properties and much higher resistivity than tungsten. After rhenium plating, the strength and resistance of tungsten wire are greatly enhanced, and the service life can be extended by 5 times! At the same time, people begin to make the filament spiral, which can reduce the occupied space and improve the luminous efficiency, on the other hand, it can continue to reduce the evaporation of tungsten and prolong the service life, killing two birds with one stone;

3. 1936, people made a double helix filament, which raised the working temperature of inflatable incandescent lamps to more than 2500, and even reached 3000 for photographic incandescent lamps: the first generation of incandescent lamps has matured.