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Search Publications by: Yoshi Ohno (Assoc)

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Displaying 1 - 25 of 391

Maximum Luminous Intensity of LED-lighted X signs for Airport Runways

June 12, 2024
Author(s)
Yoshi Ohno, Maritoni Litorja, C Cameron Miller
This is a report for Inter-agency agreement 693KA9-18-N-00023 "Maximum Luminous Intensity for LED Signaling in an Airport Environment" by Federal Aviation Administration (FAA) and National Institute of Standards and Technology (NIST). The LED-based lighted

VISION EXPERIMENT ON CHROMA SATURATION PREFERENCE IN DIFFERENT HUES

November 15, 2017
Author(s)
Yoshihiro Ohno, Youngshin Kwak, Semin Oh
Increase of chroma is known to be a major factor for color quality preference in lighting, and gamut area measures are often used to evaluate preference aspects. However, gamut area accounts for chroma differences equally for all hue directions

VISION EXPERIMENT ON PERCEPTION OF CORRELATED COLOR TEMPERATURE

November 14, 2017
Author(s)
Yoshi Ohno, Hyeyoung Ha, Youngshin Kwak
The correlated color temperature (CCT) is defined by the closest point on the Planckian locus from a light source on the (now obsolete) CIE 1960 (u, v) diagram, while the current standard uniform color space is the CIE 1976 (u', v') diagram. To re-visit

Color Quality (book chapter)

July 11, 2017
Author(s)
Yoshihiro Ohno
This book chapter provides the fundamentals of colorimetry and color quality for solid state lighting, including descriptions of the current standards on chromaticity of SSL light sources and color rendering, and recent studies on these topics. Section 8.1

Photometry (Chapter of Handbook of Visual Optics)

April 25, 2017
Author(s)
Yoshihiro Ohno
The fundamental concept of photometry, the definition of the photometric base unit candela, and the spectral luminous efficiency function V(lambda) are first introduced. Then definitions of important photometric quantities and units, such as luminous flux

Color Quality Metrics – Recent Progress and Future Perspective

July 30, 2016
Author(s)
Yoshihiro Ohno
The color quality of light sources for lighting includes the effects of white light chromaticity, as well as color rendition characteristics, including color fidelity and the aspects related to color preference and perception. In this paper, the current

SOLID-STATE LIGHTING MEASUREMENT ASSURANCE PROGRAM SUMMARY WITH ANALYSIS OF METADATA

March 31, 2016
Author(s)
Carl C. Miller, Yoshihiro Ohno, Maria E. Nadal, Benjamin K. Tsai, Yuqin Zong
The National Institute of Standards and Technology (NIST) began to offer proficiency testing for Solid-State Lighting (SSL) products through a Measurement Assurance Program (MAP) in 2010. This article communicates the results of the first version of the