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High Speed Gonio-Photometer by Means of Multi-Photoreceptors Osamu Yamada (Member) Yoshihiro Ohono (Member) Syuji Tamaru (Member) Tetsuo Matsuba (Fellow Member) and Masaaki Morita (Fellow Member) (Lighting Research Laboratory, Matsushita Electric Co., Ltd.) ABSTRACT Measuring principles and general construction of a high-speed fully automatic gonio-photometer for measurments of photometric performance of luminaires are described. The gonio-photometer consists of 58 independent photoreceptors arranged on a steel frame, constructed in such a way that the center of the photoreceptors is on a vertical plane which passes through the optical center of the luminaire to be measured, and that the direction of maximum photo-electrical sensitivity of the photoreceptors is also aimed at the optical center. The steel frame consists of five members: two horizontals, one on the floor, another on the ceiling, one vertical on the wall, two inclined at an angle of 45 degrees to connect the horizontals and the vertical; the minimum distance between the photoreceptors and the optical center is 4. 5 meters. The luminaire to be measured is fixed on a horizontal arm which can be turned around the vertical axis by means of a pulse motor mechanism. The entire measuring sequence and data processing is controlled by an integrated 16 bit micro-computor. With the gonio-photometer, measurements of the complete indicators of photometric performance of a luminaire can be finished within two minutes. Subsequent data processing to derive total flux output, zonal flux output, output ratio, together with the angular distributions of luminous intensity, can be calculated within one minute.