Today, LEDs are being used for not only the center high mounted stop lamp, but literally all exterior automotive signal lamps. These LEDs are exceedingly brighter than the 3 mm or the 5 mm devices were. These brighter devices require the use of fewer LEDs per lamp function, but at the expense of requiring higher drive currents thus generating more heat. It is this heat generation that creates an issue that must be addressed by the lamp designer. The heat being generated by the latest generation of LED devices must be removed to ensure that the device maintains it capabilities to efficiently generate light. To enable the LED to operate efficiently, certain factors of the LED must remain unchanged as it is operated over the life of the lamp in an automotive application. Two factors that must experience little or no change are the lumen output of the LED and the emitted color. The heat issue must be analyzed and eliminated or controlled when utilizing the newest "high power," high current devices in an automotive exterior signal lamp. The scope of this paper identifies the parameters that must be controlled to minimize the heat generated by the chip such that the light output of these latest "high power" LEDs is maximized and maintained.


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    Title :

    Maximizing lumen output of LEDs for automotive exterior signal lighting applications


    Contributors:
    Conn, L.G. (author)


    Publication date :

    2003


    Size :

    5 Seiten, 2 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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