Abstract: A fluorescent lamp includes: an emission tube for generating a luminous flux; a first filament provided at one end of the emission tube; a second filament provided at another end of the emission tube; first current regulation means having a first impedance; a first electrode pin coupled to one end of the first filament via the first current regulation means; a first switch coupled in parallel to the first current regulation means; a second switch; a second electrode pin coupled to another end of the first filament via the second switch; and a control circuit for controlling the first switch and the second switch so as to be opened or closed. The control circuit closes the first switch and the second switch before the fluorescent lamp is lit and during a nominal lighting period after the fluorescent lamp is lit, and opens the first switch and the second switch during a power conservation lighting period following the nominal lighting period.

Abstract: A two-wavelength band light emitting type fluorescent lamp the main light emission of which is obtained by fluorescent substances in which the ranges of the wavelength peak of light emission are located from 470 to 540 nm and from 600 to 650 nm.

Abstract: An escape light instrument using as its light source a fluorescent lamp, mainly derives its luminescence from luminophors the peak ranges of whose luminescent wavelength are from 530 to 580 nm and from 600 to 650 nm, said luminophors having 30 nm or less of half band width, wherein a luminous flux derived from a luminophor the peak range of whose luminescent wavelength is from 420 to 470 nm accounts for 4 to 10% of a total luminous flux in said main luminescent wavelength, and which permits categorical discrimination of at least green and white transmitted colors used on the sign face, and has a luminous color of 5 or more in Duv.

Abstract: A fluorescent lamp, wherein a chromaticity value (x, y) of a light source color is in a range surrounded by a point A (0.251, 0.343), a point B (0.285, 0.332), a point C (0.402, 0.407) and a point D (0.343, 0.433), includes a phosphor blend in an inner face of a luminous tube, the phosphor blend comprising an antimony and manganese activated calcium halophosphate phosphor, a rare earth phosphor emitting green, and a rare earth phosphor emitting blue or red.

Abstract: 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.

Abstract: A light source for categorical color perception has major light emitting bands in ranges from 530 to 580 [nm] and from 600 to 650 [nm], with correlated color temperature of the lamp light color in a range from 1700 to 6500 [K] 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.

Abstract: 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.

Abstract: An illumination system comprises a 1st signal generator to generate signals with a frequency range of the alpha rhythms of human brain waves, a 2nd signal generator to generate signals with a power spectrum distribution expressed by 1/f.sup.n, where n is between 0 and 2, and also with a frequency range below 50 Hz, a driver amplifier a and a driver amplifier b, both serving as light controllers to control the illumination of light sources according to the signals from the 1st and 2nd signal generators respectively and finally a light source 1 and a light source 2 to shed lights, and contributes to inducing a person under the light shedding from it to generate alpha rhythms without having an uncomfortable impression due to flickering illumination in a readily available illumination environment.