The dipped headlights are the main thing when driving. The dipped-beam characteristics of the headlights should give an asymmetric dipped-beam pattern, which is made in a stretched visual range on the right side of the road. To increase the efficiency of the headlights, various complex forms are used (HNS, PD2). To improve lighting, gas-discharge lamps are also used, which give out light almost 2 times more than halogen ones. The headlamps shall ensure the visibility of the dividing line between surfaces illuminated and not illuminated.
Such visibility can be created by special filaments that are used in lamps (H1, H7, HB4). This allows you to get the brightness lower and the shadow higher.
Requirements for lamps:
– level of minimum illumination (normal visibility)
– maximum light intensity (but not blinding drivers of cars moving to the meeting)
Design features of headlights
Conventional headlights should provide high-quality lighting, and such a paradox – the larger the size of the reflector, the better the light quality of the dipped headlights. On the geometric component of the range, the effect of the headlight increases with the height of the headlight. Such requirements can be resolved by using wide headlamp reflectors and larger ones.
Short focal lengths provide wide light beams, which improves lateral lighting and is very useful when cornering. Smooth transition reflectors consist of paraboloid sections with different focal lengths.
Single focus reflectors
To ensure increased luminous flux efficiency, there is 1 focal point with a reflector on the auxiliary sections of the reflectors to obtain a short focal length. light from auxiliary reflectors gives us an improvement in the quality of side lighting, but does not affect the far. (H4 lamp)
Multifocal reflectors differ in that the areas for receiving the light beam have a large number of focal points. The distribution of structures is carried out on the vertical sections of the parabola.
Headlights (HNS reflectors)
The surface of the next reflector includes many elements. A feature of the reflector surface is continuity and gradations on the boundary surfaces. This makes it possible to create such surface shapes of reflectors as we need and will provide the most stable lighting.
The design of the PES headlights includes optics to improve lighting. This optics is based on the use of an elliptical reflector. In PES headlights, the outgoing rays must be directed so that the area surrounding the lens also acts as a source of light. Such light is used with lenses of small diameters in order not to blind drivers of oncoming cars.
The electronic light is characterized by lighting with xenon (xenon discharge lamp). Such a lamp combines all the advantages – high lighting intensity, along with the minimum requirements for the volume of the reflective surface. This makes this headlamp model ideal compared to others.