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Abstract
The assessment of the variation of average internal illuminance from tubular light guides under different outdoor climatic conditions. Computer program Radiance was used for simulations of daylighting from tubular light guides of various dimensions. The internal illuminance calculations were compared for two extreme situations in boundary conditions – sunny summer sky and winter overcast sky, determined for the climatic region of Central Europe. Daylight simulations give information about average indoor illuminance on vertical and horizontal reference plane in the dependence of various dimensions of the light guides. Results of computer daylight simulations serve for the design optimization.