Automotive headlights direct focused light generated by a light source onto the road. On this page you will learn, among other things, about headlight design, lighting technology and legal regulations. In addition, you will get useful, practical tips for dealing with plastic headlight glass. By the way, you can find more information on bulbsizechart.com.
The headlamp housing performs the following tasks:
the holder of all headlight components (cables, reflector, etc.);
fastening to the car body,
protection from external influences (moisture, high temperature, etc.).
Thermoplastic polymers are used as a material.
The first function of a reflector is to capture as much of the light flux emitted by an incandescent lamp as possible and direct it towards the road surface. There are various reflector systems that allow this requirement to be met as effectively as possible.
Selection of reflector material
While in the past most reflectors were made of sheet steel, due to the current requirements for headlights such as manufacturing tolerances, design, surface quality, weight, etc., plastics (various thermoplastic polymers) are now predominantly used. They are manufactured with a high degree of shape reproduction accuracy.
This first of all makes it possible to make stepped and multi-chamber systems. The reflectors are then painted to obtain the desired surface quality. Reflectors made of aluminum or magnesium are also used in headlight systems subjected to high thermal loads. In the next step, a reflective layer of aluminum is applied, followed by a protective layer of silicon.
Because of their precisely limited beam path and high luminous flux, projection modules are very often used in modern headlamps. Thanks to their different lens diameters, illumination functions and installation options they can be used to create individual headlight designs.
Headlight lenses with diffuser functions direct the light flux received from the reflector onto the road surface, creating the desired light distribution, such as a light-shadow border. However, this solution has been replaced by the new FF technology.