A good car has about 200 different light sources: external lamps, compartment lighting, dashboard lighting … But while the presence of most of them will cause temporary inconveniences, the same can´t be said about the headlight lamps: normally working passing beams, driving beams and fog lamps are the question of security (both the driver´s and everyone around on the road).
Today the manufacturers offer three main kinds of headlamps: halogen, xenon and all of them are in customers´ demand. Each of them has its pros and cons, which are accounted in choosing. Simple filament lamps are used very rarely.
The classification of headlight lamp types is adopted on standards of IEC (International Electro-technical Commission). According to it, you can identify the features and destination of lamp, using its coding,.
The most common halogen lamps, used for the common passing and driving beams and the fog lamps, are designated as R2, H1, H3, H4, H7, HB3, HB4.