Journal of Light & Visual Environment
Online ISSN : 1349-8398
Print ISSN : 0387-8805
ISSN-L : 0387-8805
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Volume 13, Issue 1
Displaying 1-4 of 4 articles from this issue
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Paper
  • The Control of Luminous Color of the Discharge Lamps
    Masaharu AONO, Hisayoshi KUROKAWA, Makoto KUBO, Ryouhei ITATANI
    1989 Volume 13 Issue 1 Pages 1_1-1_9
    Published: 1989
    Released on J-STAGE: March 18, 2011
    DOIhttps://doi.org/10.2150/jlve.13.1_1
    JOURNAL FREE ACCESS
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    It is qualitatively verified by the energy conservation equation that high electron temperature is attained by the pulsed discharge with rapid current rise. In the glow discharge of the tube filled with mercury vapor and neon gas, luminous color of the positive column varies from the color close to red emitted by neon to blue of mercury by the square-wave pulsed discharge. Brightness of blue light is hundreds nits but that of red light is 100 nts at most. In the arc discharge, red light with strong brightness is easily obtained by square-wave pulses. On the other hand, blue light may be obtained at high frequency but the discharge becomes unstable at that frequency. Therefore, the current waveform alteration method is effective for luminous color control of the arc discharge.
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Research Note
  • Temporal Visual Masking by a Contrast-modulated-grating
    Shigeru ICHIHARA
    1989 Volume 13 Issue 1 Pages 1_10-1_13
    Published: 1989
    Released on J-STAGE: March 18, 2011
    DOIhttps://doi.org/10.2150/jlve.13.1_10
    JOURNAL FREE ACCESS
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    The detection threshold of a brief test stimulus, a sinusoidal grating, was measured as a function of SOA between it and a long-lasting suprathreshold masking stimulus which is a low- or a high-spatial-frequency grating (2 c/deg or 12 c/deg) or a contrast-modulated-grating consisting of three high-frequency components (10,12,14 c/deg), using the same method as Mitov, Vassilev, & Manahilov (1981). The temporal masking functions obtained with a contrast-modulated-masker and a 2 c/deg-sinusoidal-masker exhibited transient on- and off-peaks of masking, while a 12 c/deg-sinusoidal-masker did not exhibit such peaks. As those results were not inconsistent with the “simple” spatial frequency filtering model, two other hypotheses were suggested.
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  • The Comparison of the Evaluations for the Lighting between the Korean and the Japanese
    —Psychological Evaluation of the brightness and Spectral Luminous Efficacy of Dark Adaptation—
    Okhee AN, Takuko YANASE
    1989 Volume 13 Issue 1 Pages 1_14-1_21
    Published: 1989
    Released on J-STAGE: March 18, 2011
    DOIhttps://doi.org/10.2150/jlve.13.1_14
    JOURNAL FREE ACCESS
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    We compared the difference in the psychological and physiological aspects for lighting environment between the Korean and the Japanese under the same experimental conditions. Three dimensions (activity, evaluation and potency) were extracted by factor analysis in subjects from both countries. The range of the estimations for brightness was more extensive in the Korean than in the Japanese. Sensibility to light was investigated by dark adaptation. The threshold of light sensitivity to light was lower in the Korean than in the Japanese at any time in dark adaptation. Thus, both psychological and physiological evaluations proved that the Korean is more sensitive to brightness than the Japanese.
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Committee Report
  • Committee Report on Specifying Method of Color Rendering Property
    Leo MORI
    1989 Volume 13 Issue 1 Pages 1_22-1_30
    Published: 1989
    Released on J-STAGE: March 18, 2011
    DOIhttps://doi.org/10.2150/jlve.13.1_22
    JOURNAL FREE ACCESS
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    The research committee on color rendering specification (July 1985 — March 1988) of the IEIJ was organized to contribute the work of the CIE for preparing the third edition of the method for specifying the color rendering property of light sources, relating to the revision of the Japanese Industrial Standard (JIS) method. It proposed to CIE TC1-12 (Relative color rendering) statistical average data of actual spectral radiance factors of foliage colors and Japanese women’s complexions as candidates for new test-color samples. For color rendering index calculation, a combination of CIELAB space, Nayatani non-linear model for chromatic adaptation and Watarai’s chroma normalizing equation was proposed. Since TC1-12 dissolved without completing the draft for the third edition, the committee changed its aim for the preparation of a revised JIS method in accordance with the CIE second edition.
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