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.