Journal of Light & Visual Environment
Online ISSN : 1349-8398
Print ISSN : 0387-8805
ISSN-L : 0387-8805
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Volume 8, Issue 2
Displaying 1-5 of 5 articles from this issue
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Lecture
Paper
  • A high pressure sodium lamp with an improved starting circuit
    Kotaro SHIMOGAKI, Ikuo IWAI, Masahumi OCHI
    1984 Volume 8 Issue 2 Pages 2_11-2_15
    Published: 1984
    Released on J-STAGE: May 20, 2011
    DOIhttps://doi.org/10.2150/jlve.8.2_11
    JOURNAL FREE ACCESS
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    The authors previously introduced a High Pressure Sodium Lamp with increased xenon pressure to achieve higher efficacy and to enable the use on High Pressure Mercury Ballast by means of an internal starter as well2). In this paper, firstly, the relationship between the pulse voltage of the internal starter and the lamp starting ability is discussed. The authors then introduced an improved starting method by adding a simple circuit which aims to lower the maximum pulse voltage.
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  • Analysis of spectral power distributions of fluorescent lamps for the maximum luminous efficacy under given color and color rendering properties
    Shoichiro YAMAGUCHI, Seishi SEKINE, Fujio KOBAYASHI
    1984 Volume 8 Issue 2 Pages 2_16-2_23
    Published: 1984
    Released on J-STAGE: May 20, 2011
    DOIhttps://doi.org/10.2150/jlve.8.2_16
    JOURNAL FREE ACCESS
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    Numerical calculations were performed with an iterative linear programming method for the purposes of predicting the optimum spectral power distributions and the lighting characteristics of fluorescent lamps. Linear programming was used in order to minimize the range containing local solutions and insure convergence to the optimum solution. The optimum spectral power distributions of fluoresent lamps making all of special color rendering indices of R1 to R8 95 or more must be composed of four narrow spectral bands heving a radiation peak af 470, 530, 580 and 620 nm.
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  • General calculation method of illuminance from a vertical louver blind system
    Kunio MATSUURA
    1984 Volume 8 Issue 2 Pages 2_24-2_31
    Published: 1984
    Released on J-STAGE: May 20, 2011
    DOIhttps://doi.org/10.2150/jlve.8.2_24
    JOURNAL FREE ACCESS
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    A general calculation method is described for determining of illuminance from a vertical louver blind system, which slats are of negligible thickness, uniformly diffusing surfaces and uniform reflectances. Available data in practice are also prepared for this method. First, configuration factors of arbitrary position on the working plane are analytically introduted for the sky to be viewed between louver slats and for these slats themselves. Next, a direct illuminance of this position is obtained by using these configuration factors and average luminances of the sky and slats. The luminance of slat is calculated in two cases, that the window faces to the uniform sky and gronnd, and the slats are uniformly illuminated by the direct sunlight on the critical condition of precisely shading it with slats. For an indirect illuminance a simple formula by author is effective in practice. Necessary transmittances of louver system in this formula are presented as useful data in above mentioned two cases. An overlapping of results calculated in the both cases is approximately applied to almost all weather conditions with or without the direct sunlight.
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  • Photometric error due to non-uniform responsivity in a photometer aperture
    Kanji KINAMERI
    1984 Volume 8 Issue 2 Pages 2_32-2_38
    Published: 1984
    Released on J-STAGE: May 20, 2011
    DOIhttps://doi.org/10.2150/jlve.8.2_32
    JOURNAL FREE ACCESS
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    Photometric error due to non-uniform responsivity in a photometer aperture is theoretically analyzed for illuminance measurement. Such error is only caused when neither responsivity nor illuminance is distributed uniformly in the aperture of an illumination meter. This error is given by the product of the fractional-standard-deviations in both distributions and the correlation coefficient between them. The fractional-standard-deviation is consequently proposed as a parameter to describe the non-uniformity of each distribution. This theory is validated by applying it to error estimation for luminance measurement of a color TV picture tube using a luminance meter composed of a diaphragm, a tube and an illumination meter. The spacial resolutions required in the measurements of both distributions, which make it possible to precisely estimate the above error, are also discussed. It is revealed that, if the distribution of either responsivity or illuminance is more gradual than the other and sinusoidal, the resolutions should be less than 1/8 the spacial period in which the sinusoidal patterns are repeated.
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