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Consideration of Light Level in Specifying Light Source Color Rendition

期刊: LEUKOS, 2020; 16 (1)

ABSTRACT? In lighting practice, light level is seldom considered when specifying light source color rendition. Many past studies found that sources th......

Estimation of Possible Suppression of Melatonin Production Caused by Exterior Lighting in Commercial Business Districts in Metropolises

期刊: LEUKOS, 2020; 16 (2)

Policymakers and standardization bodies have started to make recommendations about the use of lighting products at night, with the goal of reducing ne......

LED Illumination and Color Appearance of White-Balanced Images

期刊: LEUKOS, 2020; 16 (3)

Recent studies revealed the failure of typical blue-pumped white light emitting diodes (LEDs) in rendering the white appearance of surface colors, whi......

Quantification of Trichromatic Light Sources to Achieve Tunable Photopic and Mesopic Luminous Efficacy of Radiation

期刊: LEUKOS, 2019; 15 (4)

This study attempts to quantify and optimize the luminous efficacy of radiation (LER) of trichromatic light sources in both photopic and mesopic visio......

JIF:2.65

A Neutral White Locus

期刊: LEUKOS, 2019; 15 (1)

It was reported recently that chromaticities of neutrality across different correlated color temperatures were not located on the Planckian locus. Thi......

JIF:2.65

Chromaticities for Producing White Stimuli Depend on Viewing Mode Rather Than Viewing Medium: A Pilot Study

期刊: LEUKOS, 0; ()

Different chromaticities for producing white appearance were found when viewing color stimuli produced by physical color samples and displays, which h......

Change of Gamut Size for Producing Preferred Color Appearance from 20 to 15000 lux

期刊: LEUKOS, 0; ()

Numerous efforts have been made to investigate how light source color rendition affects color preference. Though the effect of light level on color ap......

Effects of Illumination on Paper and Silk Substrates of Traditional Chinese Painting and Calligraphy Measured with Raman Spectroscopy

期刊: LEUKOS, 2020; 16 (1)

As the substrates of traditional Chinese painting and calligraphy, paper and silk are susceptible to optical radiation in museum illumination, resulti......

Judgment of White Appearance for Surface Colors under Individual and Simultaneous Observations

期刊: LEUKOS, 2018; 14 (4)

The weakness of the CIE whiteness formula, the most widely used formula to characterize the whiteness of surface colors, has been well documented. It ......

JIF:2.65

Evaluation of Several Different Types of Uniformity Metrics and Their Correlation with Subjective Perceptions

期刊: LEUKOS, 2017; 13 (1)

This study aimed to identify how different types of uniformity indicators function to evaluate the uniformity of lighting, such as the minimum-to-aver......

JIF:2.58

Systematic Changes in Gamut Size Affect Color Preference

期刊: LEUKOS, 2017; 13 (1)

Past work has suggested that light source color rendition can be better characterized using measures of color fidelity (for example, IES R-f, Color Qu......

JIF:2.58

Assessing and Modeling Discomfort Glare for Raw White LEDs with Different Patterns

期刊: LEUKOS, 2017; 13 (2)

This article describes an experiment carried out to evaluate discomfort glare of nonuniformly distributed light emitting diode (LED) sources. The glar......

JIF:2.58

The Role of Presented Objects in Deriving Color Preference Criteria from Psychophysical Studies

期刊: LEUKOS, 2017; 13 (3)

Although it is a critical component of any measure of color rendition, a standardized set of color samples can seldom perfectly match a real space or ......

JIF:2.58

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