A lighting apparatus comprising: a first LED module emitting a first light of a first color temperature; a second LED module emitting a second light of a second color temperature; a third LED module emitting a third light of a third color temperature; a driver for generating a first driving power, a second driving power, a third driving power respectively supplying to the first LED module , the second LED module and the third LED module ; and a controller for determining a power ratio among the first driving power, the second driving power and the third driving power corresponding to a mixed light with a target color temperature mixed by the first light, the second light and the third light, the mixed lights of different target color temperatures having chroma coordinates being within a predetermined chroma range, characterized in that percentages of the Luminous flux of the first LED module , the second LED module and the third LED module are calculated based on following Formula 1: Y W 1 Y W 2 Y W 3 = x W 1 y W 1 x W 2 y W 2 x W 3 y W 3 1 1 1 1 − x W 1 − y W 1 y W 1 1 − x W 2 − y W 2 y W 2 1 − x W 3 − y W 3 y W 3 − 1 x y 1 1 − x − y y , in the Formula 1, Y W1 is the percentage of the Luminous flux of the first white light source, Y W2 is the percentage of the Luminous flux of the second white light source, Y W3 is the percentage of the Luminous flux of the third light source, (x W1 , y W1 ) is the color coordinates of the first white light source, (x W2 , y W2 ) is the color coordinates of the second white light source, (x W3 , y W3 ) is the color coordinates of the third light source, and (x, y) is the color coordinates of the target color temperature. a first LED module emitting a first light of a first color temperature; a second LED module emitting a second light of a second color temperature; a third LED module emitting a third light of a third color temperature; a driver for generating a first driving power, a second driving power, a third driving power respectively supplying to the first LED module , the second LED module and the third LED module ; and a controller for determining a power ratio among the first driving power, the second driving power and the third driving power corresponding to a mixed light with a target color temperature mixed by the first light, the second light and the third light, the mixed lights of different target color temperatures having chroma coordinates being within a predetermined chroma range, characterized in that percentages of the Luminous flux of the first LED module , the second LED module and the third LED module are calculated based on following Formula 1: Y W 1 Y W 2 Y W 3 = x W 1 y W 1 x W 2 y W 2 x W 3 y W 3 1 1 1 1 − x W 1 − y W 1 y W 1 1 − x W 2 − y W 2 y W 2 1 − x W 3 − y W 3 y W 3 − 1 x y 1 1 − x − y y , in the Formula 1, Y W1 is the percentage of the Luminous flux of the first white light source, Y W2 is the percentage of the Luminous flux of the second white light source, Y W3 is the percentage of the Luminous flux of the third light source, (x W1 , y W1 ) is the color coordinates of the first white light source, (x W2 , y W2 ) is the color coordinates of the second white light source, (x W3 , y W3 ) is the color coordinates of the third light source, and (x, y) is the color coordinates of the target color temperature. , in the Formula 1, Y W1 is the percentage of the Luminous flux of the first white light source, Y W2 is the percentage of the Luminous flux of the second white light source, Y W3 is the percentage of the Luminous flux of the third light source, (x W1 , y W1 ) is the color coordinates of the first white light source, (x W2 , y W2 ) is the color coordinates of the second white light source, (x W3 , y W3 ) is the color coordinates of the third light source, and (x, y) is the color coordinates of the target color temperature. <EOS>