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Search Publications by: Yoshi Ohno (Assoc)

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Displaying 26 - 50 of 391

Vision experiment ii on white light chromaticity for lighting

March 30, 2016
Author(s)
Yoshihiro Ohno, Semin Oh
In response to a published discussion (Wei & Houser, 2015) on the 2013 NIST experiment on white light chromaticity for lighting (Ohno & Fein, 2013), the second experiment was conducted at NIST to determine the white light chromaticity perceived most

ANALYSES OF ERRORS ASSOCIATED WITH PHOTOMETRIC DISTANCE IN GONIOPHOTOMETRY

July 31, 2015
Author(s)
Yoshihiro Ohno, V. Jacobs, Peter Blattner, Tony Bergen, Udo Krueger, P. Rombauts, F. Schmidt, Peter Hanselaer
In lighting calculations and simulations, the emission of a light source is conventionally modelled using the far-field intensity, also termed luminous intensity distribution (LID). Previous studies have indicated that the traditional limiting photometric

VISION EXPERIMENT ON CHROMA SATURATION FOR COLOR QUALITY PREFERENCE

July 31, 2015
Author(s)
Yoshihiro Ohno, Carl C. Miller, Mira Fein
Color Rendering Index (CRI) often does not correlate well with visual evaluation of color rendering of light sources at real illuminated scenes. The main reason is that CRI measures color fidelity, while general users judge color rendering based on their

Development of the IES method for evaluating the color rendition of light

June 30, 2015
Author(s)
Yoshihiro Ohno, Aurelien David, Kevin Houser, Minchen Wei, Michael Royer, Kevin Smet, Lorne Whitehead
We have developed a two-measure system for evaluating light sources’ color rendition that builds upon conceptual progress of numerous researchers over the last two decades. The system quantifies the color fidelity and color gamut (i.e. change in object

An Experimental Approach to A Definition of The Mesopic Adaptation Field

May 14, 2015
Author(s)
Tatsukiyo (. Uchida, Yoshihiro Ohno
The CIE 191 mesopic luminous efficiency function depends on the luminance of visual adaptation field, therefore, it must be measured to implement the mesopic photometry method. However, the size and shape of the adaptation field are not defined in CIE 191

Solid State Lighting Annex 2013 Interlaboratory Comparison Final Report

October 9, 2014
Author(s)
Yoshihiro Ohno
The Interlaboratory Comparison, IC2013, for measurement of solid state lighting (SSL) products was conducted by International Energy Agency (IEA) 4E SSL Annex between October 2012 and August 2013. 55 laboratories from 18 countries participated in this

Practical Use and Calculation of CCT and Duv

October 18, 2013
Author(s)
Yoshihiro Ohno
The Correlated Color Temperature (CCT) is often used to represent chromaticity of white light sources, but chromaticity is two-dimensional, and another dimension, the distance from the Planckian locus, is often missing. Duv is defined in ANSI C78.377 for

Report of the Key Comparison CCPR-K5 Spectral Diffuse Reflectance

October 2, 2013
Author(s)
Yoshihiro Ohno, Maria E. Nadal, Kenneth L. Eckerle, E. A. Early
This is an official report from Consultative Committee of Photometry and Radiometry (CCPR) on the Key Comparison CCPR-K5 spectral diffuse reflectance, conducted in the framework of CIPM Mutual Recognition Arrangement (MRA). 13 national laboratories