A light generating system configured to provide system light, wherein the light generating system comprises (i) a first light generating device, (ii) a second light generating device, and (iii) a waveguide comprising a waveguide plate, wherein: - the waveguide plate has a first face, a second face, and a side face bridging the first face and the second face; - the first light generating device is configured to generate first device light, wherein in an operational mode the first device light has a color point in the visible; the first light generating device is configured to irradiate the side face, wherein in the operational mode at least part of the first device light escapes from the waveguide plate via the first face; and - the second light generating device is configured to generate second device light, wherein in the operational mode the second device light has a centroid wavelength of at maximum 420 nm, and has a spectral power distribution differing from a spectral power distribution of the first device light; the second light generating device is configured upstream of the second face; wherein in the operational mode at least part of the second device light is transmitted through the waveguide plate and escapes from the waveguide plate via the first face wherein the waveguide plate comprises one or more first regions, comprising a first material having a first material composition, and one or more second regions, comprising a second light transmissive material having a second material composition, wherein the first material composition and the second material composition differ; and - the second light generating device is configured upstream of at least one of the one or more second regions; wherein the second light generating device is configured to irradiate at least part of the at least one of the one or more second regions, wherein in the operational mode at least part of the second device light is transmitted through the waveguide plate via the at least part of the at least one of the one or more second regions, wherein the waveguide plate comprises a plate of the first material having through holes filled with the second material. - the waveguide plate has a first face, a second face, and a side face bridging the first face and the second face; - the first light generating device is configured to generate first device light, wherein in an operational mode the first device light has a color point in the visible; the first light generating device is configured to irradiate the side face, wherein in the operational mode at least part of the first device light escapes from the waveguide plate via the first face; and - the second light generating device is configured to generate second device light, wherein in the operational mode the second device light has a centroid wavelength of at maximum 420 nm, and has a spectral power distribution differing from a spectral power distribution of the first device light; the second light generating device is configured upstream of the second face; wherein in the operational mode at least part of the second device light is transmitted through the waveguide plate and escapes from the waveguide plate via the first face wherein the waveguide plate comprises one or more first regions, comprising a first material having a first material composition, and one or more second regions, comprising a second light transmissive material having a second material composition, wherein the first material composition and the second material composition differ; and - the second light generating device is configured upstream of at least one of the one or more second regions; wherein the second light generating device is configured to irradiate at least part of the at least one of the one or more second regions, wherein in the operational mode at least part of the second device light is transmitted through the waveguide plate via the at least part of the at least one of the one or more second regions,