Optical Metrology for LEDs and Solid State Lighting

Published

February 9, 2006

Author(s)

Yoshi Ohno

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.

Proceedings Title

Proceedings of the 5th Symposium

Conference Dates

September 8-9, 2005

Conference Location

Queretaro, 1, MX

Conference Title

Optics in Industry

Pub Type

Conferences

Download Paper

https://doi.org/10.1117/12.674617

Local Download

Keywords

color rendering, colorimetry, LED, luminous efficacy, measurement, photometry, solid state lighting, white LED

Citation

Ohno, Y. (2006), Optical Metrology for LEDs and Solid State Lighting, Proceedings of the 5th Symposium, Queretaro, 1, MX, [online], https://doi.org/10.1117/12.674617, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=840989 (Accessed October 11, 2025)