Matsushita Electric Industrial Co., Ltd.

Syouetsu Sakamoto

Masanori Shimizu

Yasuhiko Yamanaka

Tetsuji Takeuchi

Tadashi Yano

Kenjiro Hashimoto

A fluorescent lamp which produces primary light using a green emission phosphor with a peak emission wavelength at 530 nm to 560 nm and a red emission phosphor with a peak emission wavelength at 600 nm to 630 nm, is characterized in that, under illumination by said fluorescent lamp, four test colors for special color rendering index calculation, No. 9, No. 10, No. 11, and No. 12, specified in the Commission Internationale de l'Eclairage CIE Publication No. 13.3, are perceivable as red, yellow, green, and purplish blue, respectively, in terms of Munsell hues.

High efficiency fluorescent lamp with low color rendering property

A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 &lsqb;nm&rsqb; and from 600 to 650 &lsqb;nm&rsqb;, with correlated color temperature of the lamp light color in a range from 1700 to 6500 &lsqb;K&rsqb; and with DUV (distance from perfect radiator locus on UV coordinates) in a range from 0 to 70, and allows categorical perception of at least red, green, blue, yellow and white of surface colors of an illuminated object.

Light source

A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 and from 600 to 650, with correlated color temperature of the lamp light color in a range from 1700 to 6500 and with DUV (distance from perfect radiator locus on UV coordinates) in a range from 0 to 70, and allows categorical perception of at least red, green, blue, yellow and white of surface colors of an illuminated object.

Growing community of inventors

Hirakata, Japan

Syouetsu Sakamoto