Over the past five years LEDs have been widely accepted for High Mounted Stop Lamps. Now the first European rear combination lamps containing LEDs are on the road. They prove the feasibility of solid state lighting for exterior high flux applications. However the number of LEDs used per function is high compared to the single incandescent bulb they replace. Current designs use between 20 and 30 LEDs per function. Reasons for a reduction in numbers are the space large numbers of LEDs require, as well as the cost of assembling a large number of LEDs to form an LED array. For decreasing the number of LEDs per function, the flux per emitter has to increase proportionally. Besides the reduction of the total number of LEDs per function, brighter LEDs open the door for new and innovative lamp designs with higher flux requirements. Today all but the white exterior lighting functions can be realized with solid state lighting. Applications with high photometric requirements or stringent space and design constraints are feasible with the latest SnapLED 150. LED lighting solutions that follow mechanical and optical design guidelines only, neglect the importance of thermal design that is needed for high power LEDs. To achieve high values of emitted flux within the limited area of signaling functions, the thermal management of a lamp becomes an equally important part of the overall design of the lighting application. It is necessary to replace the PCB technology by an approach, that allows to significantly reduce the total thermal resistance of an application. A SnapLED clinch frame that is in good thermal contact with the lamp housing offers the said improvements.
High power LEDs in automotive exterior applications
1999
16 Seiten, 11 Bilder, 6 Tabellen, 4 Quellen
Conference paper
English
Power LEDs for automotive exterior lighting
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