One LED, various color tones for taillight

February 11, 2014 // By Christoph Hammerschmidt
The latest addition to Osram's Oslon Black Flat LED family emits yellow light and various red tones and is exceptionally bright. Specially designed for light guide applications, these LEDs can also be used for more complex solutions in the rear lighting for vehicles.

The interesting feature of this LED type: It can be used to create complex taillights. The different brightness requirements for the various functions are simply met by a variable number of LEDs and different current levels. While small LED types are typically sufficient for standard taillights, the Oslon Black Flat opens up new design option thanks to a possible current draw of up to 1000 mA. A peak brightness level of 66 lm at 350 mA is achieved with the amber version at a wavelength of 617 nm. White encapsulation, combined with thin-film chip technology, ensures that the light from these LEDs is extracted efficiently.

The new yellow and red tones extend this family of LEDs which also includes converted yellow and white versions. With no lens in the way, the light from the new version can be injected into light guides from very close range and therefore with low losses. This offers car lighting designers additional options by allowing them to create unmistakable rear lighting solutions.

The low thermal resistance of 4 K/W for red is due to the special optimized package. One of the benefits of this package is the high luminous flux at high temperatures. Since the thermal coefficient of expansion of the copper-based black QFN package match the PCB expansion coefficient, this LED type is said to be particularly stable through the temperature cycles on these boards and therefore have a long life.

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