Abstract
The results of experiments to identify the luminance on window screens are described. The experiment was conducted using thirteen different kinds of the screens. It was found that the luminance on the screens measured by Japan Industrial Standards (JIS) Method B,which is generally used for testing the ability of the screens against diffused light, was almost the same as the luminance on the screens from its openings. Moreover it was found that JIS Method was not enough to predict the luminance on the screens because the light source used in JIS Method was too small compared with actual conditions. In this study, the luminance on the screens was considered to be composed of three kinds of the light sources- direct sunlight, skylight and interior lighting. To predict the luminance on the screens, the optical characteristics of the screens that determines the luminance on the screens from each three kinds of the light source were measured separately.
