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Audi presents pure-LED headlights

Christoph Hammerschmidt <mailto:[email protected]> EE Times Europe =

<http://eetimes.eu/>
(08/10/2007 4:24 AM EDT)
MUNICH, Germany =97 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

Principle Test Engineer

ITT Incorporated

4200 Colonel Glenn Hwy., Suite 600

Beavercreek, OH 45431

TEL: 937 431 6314

FAX: 937 431 5386

EMAIL: [email protected]

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-- =

Dennis Foulke

"Every reform was once a private opinion." - Ralph Waldo Emmerson

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