A lighting system comprising a first light source, a second light source and a control system configured to control the first light source and the second light source, wherein: - the first light source is configured to provide first light source light comprising: (i) a UV component; and (ii) (iia) a blue component or (iib) a blue component and a yellow component; - the second light source is configured to provide white second light source light having a second light source light correlated color temperature; and - the lighting system is configured to provide lighting system light comprising one or more of said first light source light and said second light source light, with the lighting system light having a controllable correlated color temperature, Tc1, characterized by the lighting system light having a relatively increased UV content at increasing correlated color temperature, and the UV content can be controlled by controlling the relative contribution of the first light source, - wherein the first light source comprises a UV light source configured to provide UV first light source radiation in the wavelength range of 200-380 nm and a luminescent material configured to convert part of the UV first light source radiation into blue luminescent material light, and wherein the first light source light comprises said blue luminescent material light and said UV first light source radiation, or - wherein the first light source comprises a UV light source configured to provide UV first light source radiation in the wavelength range of 200-380 nm and a plurality of different luminescent materials configured to convert part of the UV first light source radiation into blue luminescent material light and configured to convert part of the UV first light source radiation and/or part of the blue luminescent material light into yellow luminescent material light, and wherein the first light source light comprises said blue luminescent material light, said yellow luminescent material light and said UV first light source radiation. - the first light source is configured to provide first light source light comprising: (i) a UV component; and (ii) (iia) a blue component or (iib) a blue component and a yellow component; (i) a UV component; and (ii) (iia) a blue component or (iib) a blue component and a yellow component; - the second light source is configured to provide white second light source light having a second light source light correlated color temperature; and - the lighting system is configured to provide lighting system light comprising one or more of said first light source light and said second light source light, with the lighting system light having a controllable correlated color temperature, Tc1, characterized by the lighting system light having a relatively increased UV content at increasing correlated color temperature, and the UV content can be controlled by controlling the relative contribution of the first light source, - wherein the first light source comprises a UV light source configured to provide UV first light source radiation in the wavelength range of 200-380 nm and a luminescent material configured to convert part of the UV first light source radiation into blue luminescent material light, and wherein the first light source light comprises said blue luminescent material light and said UV first light source radiation, or - wherein the first light source comprises a UV light source configured to provide UV first light source radiation in the wavelength range of 200-380 nm and a plurality of different luminescent materials configured to convert part of the UV first light source radiation into blue luminescent material light and configured to convert part of the UV first light source radiation and/or part of the blue luminescent material light into yellow luminescent material light, and wherein the first light source light comprises said blue luminescent material light, said yellow luminescent material light and said UV first light source radiation.