LEDs for solid state lighting and other emerging applications: status, trends, and challenges

M. George Craford

doi:10.1117/12.625918

2 September 2005 LEDs for solid state lighting and other emerging applications: status, trends, and challenges

M. George Craford

Proceedings Volume 5941, Fifth International Conference on Solid State Lighting; 594101 (2005) https://doi.org/10.1117/12.625918
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

LEDs have been commercially available since the 1960's, but in recent years there have been remarkable improvements in performance. These technology developments have enabled the use of LEDs in a variety of colored and white lighting applications. Colored LEDs have already become the technology of choice for traffic signals, much of interior and exterior vehicle lighting, signage of various types often as a replacement for neon, and other areas. LEDs are expected to become the dominant technology for most colored lighting applications. LEDs are beginning to penetrate white lighting markets such as flashlights and localized task lighting. With further improvement LEDs have the potential to become an important technology for large area general illumination. White LED products already have performance of over 30 lumens/watt which is nearly 3x better than incandescents. White LEDs with outputs of more than 100 lumens are already available commercially, and higher power devices can be expected in the near future. LEDs can be used as point sources, or can be used with light guides of various types to provide distributed illumination. Developments that will need to occur for LEDs to be viable for large area general illumination are discussed.

Citation Download Citation

M. George Craford "LEDs for solid state lighting and other emerging applications: status, trends, and challenges", Proc. SPIE 5941, Fifth International Conference on Solid State Lighting, 594101 (2 September 2005); https://doi.org/10.1117/12.625918

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