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In the luminance distribution of a lit sign, having no irregularities in brightness is desirable, that is, the uniformity ratio of the luminance should be good. The uniformity ratio is decided by various factors such as the number of lamps, the spacing of the lamps, the distance between the light source and the luminous surface, the inner surface reflectance, and the luminous surface reflectance. A simple prediction method to obtain the relationship between these factors and the uniformity ratio of the luminance was tested by using calculations on a two-dimensional surface. We found that the method was suitable, because the calculated and experimental results agreed with each other.

On the Simple Prediction Method for Luminance Distribution on Luminous Surfaces of Lit Sign