A light source comprising: a light engine comprising an array of blue LED chips and UV-violet LED chips, the UV-violet chips comprising a peak emission at a wavelength of 380 nm to 420 nm; wherein the array is coated on at least a portion of the blue LED chips and on at least a portion of the UV-violet LED chips with a phosphor composition, and the light source in operation emitting white light having a Lighting Preference Index - hereafter abbreviated 'LPI' - of at least 105 and comprising a UV-violet flux of at least 1%; wherein LPI is defined as follows: LPI = 100 + 19 × 1 − 100 Duv + 0.010 2 + 0.62 × NSV − HDV / 2.5 where: Duv is the distance of the colour point of the white light from the blackbody locus in the 1976 CIELUV chromaticity space, and NSV ('Net Saturation Value') is the average of 10 NSV i values, one for each main hue category in the Munsell system, i.e., NSV = ∑ i = 1 10 NSV i / 10 where NSV i =(percent of CRVs in hue i with 2.3 < Δ C ab < 15) - (percent of CRVs in hue i with Δ C ab < -2.3), where CRV ('Colour Rendition Vector') is a representation of the magnitude and direction of a colour appearance shift in CIELAB colour space with respect to the CIE reference illuminant, the radial component of which Δ C ab quantifies the shift in chroma or saturation, and a CRV is calculated for all 1600 corrected Munsell glossy spectral reflectances in the Joensuu Munsell Glossy Spectral Database, and HDV ('Hue Distortion Value') is the average of 10 HDV i values, one for each main hue category in the Munsell system i.e., HDV = ∑ i = 1 10 HDV i / 10, where HDV i = percent of CRVs in hue i with Δh ab > π 20 × Δ h ab, avg, i π / 20, where Δ h ab is the azimuthal component of the CRV and represents the shift in perceived hue, i represents the hue category for the 10 main hue categories of the Munsell system, and Δ h ab,avg,i is the average Δ h ab value for all colours within hue i, characterised in that the phosphor composition is configured to not appreciably absorb light from the UV-violet LED chips by transmitting greater than 50%, preferably at least 90%, of the light from the UV-violet LED chips. a light engine comprising an array of blue LED chips and UV-violet LED chips, the UV-violet chips comprising a peak emission at a wavelength of 380 nm to 420 nm; wherein the array is coated on at least a portion of the blue LED chips and on at least a portion of the UV-violet LED chips with a phosphor composition, and the light source in operation emitting white light having a Lighting Preference Index - hereafter abbreviated 'LPI' - of at least 105 and comprising a UV-violet flux of at least 1%; wherein LPI is defined as follows: LPI = 100 + 19 × 1 − 100 Duv + 0.010 2 + 0.62 × NSV − HDV / 2.5 Duv is the distance of the colour point of the white light from the blackbody locus in the 1976 CIELUV chromaticity space, and NSV ('Net Saturation Value') is the average of 10 NSV i values, one for each main hue category in the Munsell system, i.e., NSV = ∑ i = 1 10 NSV i / 10 where NSV i =(percent of CRVs in hue i with 2.3 < Δ C ab < 15) - (percent of CRVs in hue i with Δ C ab < -2.3), where CRV ('Colour Rendition Vector') is a representation of the magnitude and direction of a colour appearance shift in CIELAB colour space with respect to the CIE reference illuminant, the radial component of which Δ C ab quantifies the shift in chroma or saturation, and a CRV is calculated for all 1600 corrected Munsell glossy spectral reflectances in the Joensuu Munsell Glossy Spectral Database, and HDV ('Hue Distortion Value') is the average of 10 HDV i values, one for each main hue category in the Munsell system i.e., HDV = ∑ i = 1 10 HDV i / 10, where HDV i = percent of CRVs in hue i with Δh ab > π 20 × Δ h ab, avg, i π / 20, where Δ h ab is the azimuthal component of the CRV and represents the shift in perceived hue, i represents the hue category for the 10 main hue categories of the Munsell system, and Δ h ab,avg,i is the average Δ h ab value for all colours within hue i, characterised in that the phosphor composition is configured to not appreciably absorb light from the UV-violet LED chips by transmitting greater than 50%, preferably at least 90%, of the light from the UV-violet LED chips.