Abstract
As a request of the Committee on Photometry, Illuminating Engineering Institute of Japan, some problems on the photometry of high pressure mercury lamps have been studied in the authors' laboratory.1) A precise method for the light distribution measurements of a high pressure mercury lamps is described, and the effect of polarization characteristics of three mirrors used for this measurement is analysed.2) The variations in the total flux due to the operating circuit conditions and the power supply characteristics are discussed.3) The stability test of performance characteristics of high pressure mercury lamps was made, and the variation in the total flux due to the inclination from the reference operating position is also observed. As a result, it has been made clear that selected high pressure mercury lamps are enough stable to be used as standard source.4) Properties of the photometric receivers used in authors' laboratory are described.5) For three selected high pressure mercury lamps, the total flux has been determined by the above mentioned method and the luminous flux standard for the high pressure mercury lamps is established.
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