An illumination device comprising: two or more color channels, each color channel including one or more light sources for generating a color light, wherein for at least one of the two or more color channels, each color channel includes one or more light sources of a first type for generating a first light and one or more light sources of a second type for generating a second light, wherein the first light is a narrow band light, wherein a dominant wavelength of the first light and a dominant wavelength of the second light are within 50 nm of each other, and wherein a width of a combined spectrum that is a sum of normalized spectra of the first and second lights is greater than a width of a normalized spectrum of the first light by at least 10 nm; and a wavelength-based light combiner for combining the color lights from the two or more color channels into a combined light, wherein a width of the normalized spectrum of the second light is greater than the width of normalized spectrum of the first light by at least 10 nm, wherein the light sources of the first type comprise light emitting diodes (LEDs) and/or laser diodes (LDs) emitting the first light, and the light sources of the second type comprise a wavelength conversion material which converts an excitation light to the second light, wherein a first one of the two or more color channels includes a plurality of first color light sources of the first type located in a first area and a plurality of first color light sources of the second type located in a second area, wherein a second one of the two or more color channels includes a plurality of second color light sources of the first type located in a third area and a plurality of second color light sources of the second type located in a fourth area, and wherein the light combiner includes a first dichroic filter for combining light generated by the first color light sources of the first type and light generated by the second color light sources of the second type, and a second dichroic filter for combining light generated by the first color light sources of the second type and light generated by the second color light sources of the first type. two or more color channels, each color channel including one or more light sources for generating a color light, wherein for at least one of the two or more color channels, each color channel includes one or more light sources of a first type for generating a first light and one or more light sources of a second type for generating a second light, wherein the first light is a narrow band light, wherein a dominant wavelength of the first light and a dominant wavelength of the second light are within 50 nm of each other, and wherein a width of a combined spectrum that is a sum of normalized spectra of the first and second lights is greater than a width of a normalized spectrum of the first light by at least 10 nm; and a wavelength-based light combiner for combining the color lights from the two or more color channels into a combined light, wherein a width of the normalized spectrum of the second light is greater than the width of normalized spectrum of the first light by at least 10 nm, wherein the light sources of the first type comprise light emitting diodes (LEDs) and/or laser diodes (LDs) emitting the first light, and the light sources of the second type comprise a wavelength conversion material which converts an excitation light to the second light, wherein a first one of the two or more color channels includes a plurality of first color light sources of the first type located in a first area and a plurality of first color light sources of the second type located in a second area, wherein a second one of the two or more color channels includes a plurality of second color light sources of the first type located in a third area and a plurality of second color light sources of the second type located in a fourth area, and wherein the light combiner includes a first dichroic filter for combining light generated by the first color light sources of the first type and light generated by the second color light sources of the second type, and a second dichroic filter for combining light generated by the first color light sources of the second type and light generated by the second color light sources of the first type.