A metal halide lamp with ultra-high-color rendering property

概要

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In the field of the high intensity discharge lamp, a metal halide lamp with ultra-high-color rendering property that has the general color rendering index (Ra) of over 99 has been developed. Up to now by the fillings of SnBr_2 and Snl_2,separately or combinationally, at most Ra=94,though maximum in the highintensity discharge lamp, was attainable and its special color rendering index for red color (R_9) was under 80. By the fillings of SnBr_2+Cal_2,the molecular spectrum of CaBr that radiates at the wavelengths of 625 nm and 627 nm compensates for the shortage in the red zone spectrum of SnBr_2-Snl_2 fillings and it makes possible for the chromaticity of the new lamp to lie almost on the Planckian locus. It is attainable in the new lamp that Ra value is over 99,all special color rendering indexes are over 98,color temperature is 4000 K〜5000 K, and luminous efficacy is about 60 lm/W (at 400-watt input power).
社団法人照明学会の論文