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Yoshihiko Tabuchi (Fellow Member) (Lighting Advisory Bureau, Matsushita Electric Works, LTD.) SUMMARY Integration of daylight and electric light is one of the important lighting factors in the unilaterally lit office room in the daytime. The unilateral lighting brings some problems differ from ordinary artificial lighting, as the luminance of the wimdow is almost the same as that of the fluorescent lamp lighting fitting, but the area of the window is much larger, and as the direction of flow of daylight is nearly horizontal. Among the lighting requirements, particularly those for visual tasks, especially papers on the desk and a human face are studied. Particularly requirements for the human face are important and as follows: (1) Prevention of the silhouette effect of the human face in front of the lateral window. (2) Improvement of the modelling of the human face near the window. These are studied and combined requirements for the suitable integration of electric light and daylight are lead. An example of measured illuminance distribution in the unilaterally lit office and the evaluation of this for the above requirements are shown.

Lighting Requirements for Integration of Daylight and Electric Light in the Unilaterally Lit Office Room