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A method for controlling color temperatures of high color rendering HPS lampsIto, Kazuhiko; Ozawa, Masataka; Koyama, Kazutaka · 1988
D. C. Operation of High-Pressure Sodium Lamps with High Color RenderingKoyama, Kazutaka; Ozawa, Masataka · 1995
A study of electric discharge phenogenon on the D. C. operation of high pressure sodium lampsOzawa, Masataka; Ito, Kazuhiko; Koyama, Kazutaka · 1986