Koninklijke Philips Corporation N.v.

Shin'ichi Honma

Josef Andreas Schug

Michael Haacke

Pieter Postma

It is provided a LED light () for a motor vehicle, comprising several LED fields (), wherein each LED field () comprises at least one LED (L, L, L, L), a housing () for supporting the LED fields () and a circuit board () comprising a driving electronics for operating the LED fields (), wherein the LED fields () are connected in series by the driving electronics and the driving electronics is adapted to switch on and off each LED field () according to its position in the series in dependence of a signal, wherein the circuit board () is connectable to an outside of the LED light () located current source () for applying an electrical current to the LED fields (), and wherein the circuit board () is integrated into the housing (). Since complicated and/or changing switching orders of the LED fields () are not intended the necessary circuit board () for providing the corresponding driving electronics may be so small that it may be integrated into the housing () of the LED light () without significantly increasing the building space. Particularly a lot of wires between a central control unit and the different LED fields () are omitted as well as the central control unit itself so that the LED light () only requires a small building space.

LED light

A device and a method for the control of a gas discharge lamp are disclosed. In order to detract as little as possible from lamp life in spite of the luminous flux requirements to be fulfilled during the run-up of the lamp, the lamp is operated with an alternating current in a run-up phase which comprises at least the interval from 1 s to 3 s after lamp ignition, the amplitude of said current rising during the run-up phase. After the rise in the run-up phase, the current may first rise further or remain constant in a transitional phase which preferably follows the former phase, and is subsequently reduced until the lamp enters the stationary operational phase. The time gradient of the current is preferably chosen such here that minimum values for the luminous flux of the lamp are achieved at given moments. Particular advantages are obtained, for example, in the case of Hg-free lamps which are operated with high currents, especially during the run-up.

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Aachen, Germany

Shin'ichi Honma