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Proceedings Paper

Optical metrology for LEDs and solid state lighting
Author(s): Yoshi Ohno
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Paper Abstract

The performance of Light Emitting Diodes (LEDs), including efficiency, flux level, lifetime, and the variation of color, is advancing at a remarkable pace. LEDs are increasingly used for many applications including automotive, aviation, display, transportation and special lighting applications. White LEDs are expected for general lighting applications (solid state lighting) in the near future. Thus, accurate measurements of LEDs and appropriate standards are increasingly important. This paper reviews photometric, radiometric, and colorimetric quantities used for LEDs, and discusses the current state of optical measurements of LEDs and standardization efforts in International Commission on Illumination (CIE). The paper also touches on the issue of color quality (e.g., Color Rendering Index) of light expected from solid state lighting, and the need for a new metric. The calibration facilities and services for LEDs established at NIST are also discussed.

Paper Details

Date Published: 10 February 2006
PDF: 8 pages
Proc. SPIE 6046, Fifth Symposium Optics in Industry, 604625 (10 February 2006); doi: 10.1117/12.674617
Show Author Affiliations
Yoshi Ohno, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 6046:
Fifth Symposium Optics in Industry
Eric Rosas; Rocío Cardoso; Juan C. Bermudez; Oracio Barbosa-García, Editor(s)

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