"In this context there is an interest to produce light distributions for main functions of headlights with high efficiency. The efficiency meant here concerns the electric power standardised for the luminous flux of a semiconductor-light source. This is to be still differentiated from m optical efficiency, which can be defined as the standardized luminous-flux portion, of the produced luminous flux, which actually amounts to the desired light distribution.
"In this connection, EP 1 357 332 A2 concerns an optical efficiency and shows a relatively compactly constructed light module for a motor-vehicle headlight, whereby the light module is made of a semiconductor-light source in a form of a light-emitting diode arranged on an optical axis of the light module. Light of the light-emitting diode is mainly emitted orthogonally toward the optical axis of the tight module and thereafter focused by a primary optics made-up as a half-cup-shaped reflector on an edge of a mirrored panel arranged horizontally and on the level of the optical axis of the motor vehicle.
"Light propagating directly past the edge as well as light reflecting at the mirrored panel is bundled by a secondary optics made-up of a projector lens and projected into the front area of the headlight. Hereby, a light distribution with a sharp cut-off line is being produced in the front area of the headlight, which results from the projection of the panel edge. By use of the mirrored and horizontally positioned panel, a high optical efficiency is achieved since the light not needed in the darker area of the resulting light distribution is not merely cut off, but directed toward the secondary lens and, from there, into the light area by the position and reflection of the panel.
"Generally, in regard to headlight main functions, even when there is high optical efficiency that, produce high luminous fluxes, there is a need for semiconductor-light sources. To produce a maximum luminous flux with a given light-emitting diode as a semiconductor-light source, it is principally possible to operate it at an unfavorable working point in regard to energy efficiency for that light-emitting diode, which is close to the maximum electric current of the light-emitting diode. Hereby, comparatively much heat is produced, which has to be discharged. If a working point is chosen that is more favorable in view of the efficiency, then the luminous flax is reduced. To achieve the total necessary luminous flux, several separate light modules can be used, which, on the other hand, would lead to a less compact solution. This course is followed in EP 1 357 332 A2.
"It is assumed that putting the focus on optimizing the energy efficiency of a headlight equipped with a certain, amount of semiconductor-light sources goes hand in hand with unwanted restrictions, which will affect the quality of the light distribution in a direct or indirect way. Such unwanted restrictions could be, e.g., the flexibility or possibility to fulfill special requirements.
"Thus, there is a need in the related art for a motor-vehicle headlight with which it is possible to achieve high-energy efficiency without having to deal with major restrictions."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The invention overcomes disadvantages in the related art in a headlight for a motor vehicle. The headlight comprises at least two semiconductor-light sources and a plurality of light refractors and/or reflecting optics. Light of each of the semiconductor-light sources is directed into a front area of the headlight such that the light produces at the front area a rule-consistent light distribution. An illuminated section of the light distribution of a first of the semiconductor-light sources is not identical with an illuminated section of a second of the semiconductor-light sources. The first semiconductor-light source defines a first construction type and the second semiconductor-light source defines a second construction type. The first construction type defines higher luminous flux and lower efficiency relative to luminous flux and efficiency defined by the second construction type.
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