JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
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Volume 99, Issue 11
Displaying 1-4 of 4 articles from this issue
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Original Papers
  • Development of LED Road Traffic Signal Using “Phantom Board”
    Kazutaka Hongo, Makoto Miyauchi, Kentarou Hayashi, Masahiro Kourogi, Y ...
    2015 Volume 99 Issue 11 Pages 589-593
    Published: November 01, 2015
    Released on J-STAGE: February 01, 2016
    DOIhttps://tzjy-jsjc-gov-cn-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.2150/jieij.99.589
    JOURNAL FREE ACCESS
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    Blue LEDs are now mass-produced, and road traffic signal heads using LED systems are being used. LED signal heads have advantages such as energy savings and a long life. However, newly proposed LED signal heads have difficulty reducing problems such as the washout phenomenon. In this paper, we have proposed reducing the washout phenomenon of LED signal heads by using LED element 192 and the low-reflection black plate called a“phantom board”on a blank area between the elements. On the basis of light intensity distribution and luminance uniformity measurements, it was confirmed that the LED signal head we proposed satisfies the conditions described in the traffic signal lighting specifications of the National Police Agency. The visibility of the signal head was improved, as apparent from the before and after improvement pictures taken in the morning and the evening when the sun was at a low altitude and as a result of the phantom ratio.
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  • Providing Individual Illuminance and Color Temperature in an Intelligent Lighting System Without Using a Chroma Meter
    Mitsunori Miki, Risa Kawashima, Hiromitsu Nakabayashi, Hiroto Aida
    2015 Volume 99 Issue 11 Pages 594-600
    Published: November 01, 2015
    Released on J-STAGE: February 01, 2016
    DOIhttps://tzjy-jsjc-gov-cn-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.2150/jieij.99.594
    JOURNAL FREE ACCESS
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    The authors have conducted a research on an Intelligent Lighting System with low power consumption, that achieves an appropriate illuminance and color temperature for individual office workers by using a chroma meter as a sensor. However, as these chroma meters are expensive, it is not easy to introduce them into offices. For this reason, we have proposed a new method for an Intelligent Lighting System that achieves individual illuminance and color temperature without using a chroma meter. To verify the effectiveness of the proposed method, we have performed a comparative experiment between the method using a chroma meter and the proposed method. From the experiment, it was possible to achive an appropriate illuminance and color temperature for individual office worker, when the sensors were separated.
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