配光測定装置と球形光束計の測定値比較(<特集>LED照明を支える光測定技術)

概要

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Intercomparison of the measured total-luminous-flux values among the sphere photometers using the 76-inch, 40-inch integrating spheres and 40-inch hemisphere, and the 3.3 foot photometric distance goniophotometer was performed, and then their consistency was considered. Although stably-lighting LED lamps were selected after 100-hour aging, about 1 hour aging was required to have them stable before the measurement. Reproducibility including the difference in equipments was less than ±0.2 %. The total-luminous-flux of omnidirectional lamps having the angular luminous intensity distribution same as a standard lamp accorded in less than ±0.6 % among the sphere photometers and the goniophotometer. On the other hand, the total-luminous-flux of directional lamps accorded in more than ±1.5 %. It is thought that the total-luminous-flux of directional lamps is attenuated because of the influence of the lamp support stand and other structures in the 40-inch integrating sphere. Since the measured value of the integration hemisphere is the same as those of the large integrating spheres, there is little error caused by the structures in it.
2013-03-01