초록 ▼

As a white light source, the lighting system (1) has at least three light-emitting diodes (6, 7, 8) for providing visible light at preselected wavelengths. The invention is characterized in that the lighting system (1) is provided with at least one fourth light-emitting diode (9) which, in operation

As a white light source, the lighting system (1) has at least three light-emitting diodes (6, 7, 8) for providing visible light at preselected wavelengths. The invention is characterized in that the lighting system (1) is provided with at least one fourth light-emitting diode (9) which, in operation, emits visible light in a further wavelength region, the maximum of the spectral emission of the fourth light-emitting diode (9) lying in the further wavelength region from 575 to 605 nm. Preferably, the further wavelength region ranges from 585 to 600 nm. Preferably, the color rendition of the lighting system (1) is above 60. Preferably, the luminous efficacy of the lighting system (1) is above 30 lm/W, preferably above 40 lm/W. In another preferred embodiment, the color temperature of the lighting system (1) can be adjusted by selectively switching the light-emitting diodes (6, 7, 8, 9).

대표청구항 ▼

[ What is claimed is:] [1.]1. A lighting system for producing white light, which lighting system comprises four light-emitting diodes, each one of the light-emitting diodes emitting, in operation, visible light in a preselected wavelength range, one of the said light emitting diodes having a maximum

[ What is claimed is:] [1.]1. A lighting system for producing white light, which lighting system comprises four light-emitting diodes, each one of the light-emitting diodes emitting, in operation, visible light in a preselected wavelength range, one of the said light emitting diodes having a maximum of spectral emission lying in the wavelength range from 575 to 605 nm, wherein the luminous efficacy of the lighting system is greater than 40 lm/W.