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Measurement device for light pipe evaluation

. Two types of light pipes of comparable dimensions were tested. The evaluation of light guides was based on data of long-term measurements of daylight illuminance. A set of illuminance meters distributed on the reference plane under the light pipes were used. The illuminance measurements were processed using a data collecting system. The system collected data for one-year continual measurements. The measured data analysis shows differences in the tested light pipes daylighting which is relevant to their practical applications.