Journal of Light & Visual Environment
Online ISSN : 1349-8398
Print ISSN : 0387-8805
ISSN-L : 0387-8805
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Volume 36, Issue 2
Displaying 1-6 of 6 articles from this issue
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Foreword
Papers
  • Comparison of Life Cycle Assessments of LED Light Sources
    Leena Tähkämö, Marjukka Puolakka, Liisa Halonen, George ...
    Article type: Paper
    2012 Volume 36 Issue 2 Pages 44-54
    Published: August 01, 2012
    Released on J-STAGE: September 04, 2012
    DOIhttps://doi.org/10.2150/jlve.36.44
    JOURNAL FREE ACCESS
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    Several life cycle assessments of light sources have been conducted during last two decades. This article compares their methods and results, and identifies the challenges. Light-emitting diode (LED) is considered as an environmentally friendly solution for lighting. The LEDs have the potential to be the most environmentally friendly light sources not least because of their increasing luminous efficacy and long lifetime. However, there are neither detailed data nor a profound life cycle assessment of a range of LED lighting products to undisputedly prove their environmental performance. Currently, the total life cycle environmental impacts of LED light sources are not known due to uncertainties and lack of peer-reviewed assessments.
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  • Sound Communication System of LED Using Maximum Length Sequence
    Atushi Minato, Jiayu Liu, Fuhui Guo, Masanori Itaba, Satoru Ozawa
    Article type: Paper
    2012 Volume 36 Issue 2 Pages 54-58
    Published: August 01, 2012
    Released on J-STAGE: September 04, 2012
    DOIhttps://doi.org/10.2150/jlve.36.54
    JOURNAL FREE ACCESS
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    We are developing sound communication system. Modulated LED light is transformed to electromagnetic wave and received by AM radio. Our previous modulation technique has small peaks at AM frequency region. The small peaks cause trouble when multiple sound sources are used with different AM frequencies. We propose new modulation techniques having no small peaks. Power spectrum and sound quality are compared between our modulation techniques.
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  • Evaluation of Glare from Color LEDs for Young and Elderly
    Takako Kimura-Minoda, Miyoshi Ayama
    Article type: Paper
    2012 Volume 36 Issue 2 Pages 59-63
    Published: August 01, 2012
    Released on J-STAGE: September 04, 2012
    DOIhttps://doi.org/10.2150/jlve.36.59
    JOURNAL FREE ACCESS
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