Audi presents pure-LED headlights

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Audi presents pure-LED headlights

Dennis Foulke

Audi presents pure-LED headlights

Christoph Hammerschmidt <mailto:[hidden email]> EE Times Europe
(08/10/2007 4:24 AM EDT)
MUNICH, Germany — Audi claims to be the first car manufacturer using LED
headlights. The company has developed a headlight assembly in which all
lighting functions are implemented as semiconductors.

The assembly contains low-beam headlamps as the main function,
consisting of two LED arrays with four active elements each, embedded in
a free-form reflector. Three additional LED arrays with two LED chips
each are located behind an optical lens; their task is controlling the
bright/dark boundary and the range of the headlights. For the high-beam
headlight, a four-LED array is located adjacent to the low-beam arrays.
Near the lower edge of the assembly, a row of 24 LEDs forms the daytime
running light. Further elements of the lighting assembly are printed
circuit boards carrying the LED chips and a heat sink. In addition, a
blower is provided to keep the LEDs cool and to de-ice the unit.

At a current of 1 A, each LED array achieves a luminous flux of 600
lumen, Audi claims. For the future, the company plans to combine the LED
technology with other innovative semiconductor-driven headlamp
technologies such as swiveling headlights.

The assembly will come as an option for the R8 luxury sports car from
2008, the company said. For the deployment of pure LED lights in
production cars, Audi has received a special permission from the EU
traffic administration. A regulation regarding the use of this
technology for vehicles in general is expected for 2008.

Dennis Foulke

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Dennis Foulke

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