Journal of the Illuminating Engineering Institute of Japan

Journal of the Illuminating Engineering Institute of Japan

Online ISSN : 2185-1506
Print ISSN : 0019-2341
ISSN-L : 0019-2341

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Volume 50, Issue 2

Displaying 1-7 of 7 articles from this issue

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A Theoretical Study of the Problem Presented by Depreciation of the Luminous Flux in Interior Lighting Installations

Ernst Wittig, Drago Matanovic, Rionoske Krossawa

1966 Volume 50 Issue 2 Pages 52-63
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_52

JOURNAL FREE ACCESS

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The illumination level in an interior lighting installation is not constant but gradually drops from its initial highest value, in the lapse of time, due to the influence of several factors. The authors picked up and studied theoretically, among others, four factors as following: lamp depreciation, dust accumulation on the luminaires, dust and dirt deposition on the room surfaces and lamp failure. For studying the former two factors, exponential relations with respect to time were assumed, while a linear relation was also taken for a simpler approximation.
Some economic problems were solved: comparison between individual and group replacement of lamps, decision on the lamps replacement period, decision on the luminaires cleaning period, etc. Graphical methods and simple practical formulas were presented.
Conclusions from the studies on the second and third factors as above agree with those formerly given by P. Moon and D. E. Spencer and by R. N. Edwards jr.

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Electrical Equipment for Apartment-Dwellers

[in Japanese]

1966 Volume 50 Issue 2 Pages 64-69
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_64

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Proposed Usage of Luminance and Helios

[in Japanese]

1966 Volume 50 Issue 2 Pages 70-74
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_70

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Fluorescent Lamps for Plant Cultiration

[in Japanese]

1966 Volume 50 Issue 2 Pages 75-77
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_75

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Petition for Accelerated Installation of Highway Illumination Facilities

[in Japanese]

1966 Volume 50 Issue 2 Pages 78-79
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_78

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[title in Japanese]

[in Japanese]

1966 Volume 50 Issue 2 Pages 80-83
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_80

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[title in Japanese]

1966 Volume 50 Issue 2 Pages plate1-plate4
Published: February 25, 1966
Released on J-STAGE: July 19, 2011

DOIhttps://doi.org/10.2150/jieij1917.50.2_plate1

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