Optical design of LED-based automotive tail lamps
2007
The application of ultra bright monochromatic and white High-Power-LEDs in the range of automotive lighting systems
is now state of the art. These LEDs offer new possibilities in optical design and engineering within different fields of
automotive lighting, e.g., tail lamps, signal lamps, headlamps and interior lighting.
This contribution describes the process of the optical design of an automotive LED tail lamp based on a practical
example. We will elaborate the principal geometric approach, the radiometric conditions and the optical design by using
standard and advanced mathematical optimization methods. Special attention will be paid to the following topics:
efficient light coupling from the LED into the optical device, adaptation of the illuminance and optimization with respect
to the requirements from SAE/ECE regulations.
It will be shown that the development of LED-lamps requires the complex interaction of several factors. The challenge
for the optical designer is to fulfill the technical demands while also considering the appearance of the final product
desired by the customer. Further design specifications emerge from the electrical and thermal layout of the lamp.
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