JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
An Illuminance Calculation in a Room Containing Fixtures (Part 2)
In Case of the Light Source with Louvers
Naotaka IkemotoMinoru Isomura
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1995 Volume 79 Issue 11 Pages 678-686

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Abstract

The luminous flux transfer method has been used widely as a calculation method of the illuminance distribution on a working plane in interior lighting. However, the conventional method was considered inapplicable in case of unempty room with louvered light sources.
In this paper, we propose a new method to calculate the illuminance distribution on the working plane in a room with louvered light sources. This new method is based on the assumption that the luminous intensity distribution for louvered light source can be represented as a polynomial expression with the components of cosine to the nth power. The illuminance distribution on the working plane was calculated by the sum of the illuminance of each component of the luminous intensity distribution.
The illuminance distributions on working plane calculated by this new method are in good agreement with the measured results. The new method is simple and saves time.
It may also be used to solve a kind of interreflection problem without difficulty.

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