A lighting apparatus comprising: a first light source unit and a second light source unit adapted to emit lights having different color coordinates from each other; a third light source unit adapted to emit light having a color coordinate which is different from that of the second light source unit; a sensor adapted to sense respective light quantities of an R component, a G component and a B component of light mixed with lights emitted from the first light source unit, the second light source unit and the third light source unit, and to output a first component signal, a second component signal and a third component signal, which respectively correspond to light quantities of the R component, the G component and the B component; a memory adapted to store a standard color coordinate located within an area formed by the color coordinates of the light output from the first light source unit, the second light source unit and the third light source unit; a controller adapted to receive the first component signal, the second component signal and the third component signal from the sensor, to generate a color coordinate by using tristimulus values of X, Y and Z which are calculated by using the first component signal, the second component signal and the third component signal respectively, wherein the controller is further adapted to compare the color coordinate with the standard color coordinate read from the memory, and to control light quantities of the first light source unit, the second light source unit and the third light source unit in such a manner as to reduce an error value between the standard color coordinate and the color coordinate; and a power supplier adapted to supply voltage changing the light quantities of the first light source unit, the second light source unit and the third light source unit under the control of the controller, characterized in that the first light source unit is adapted to emit light having a color temperature of 6500K, the second light source unit is adapted to emit light having a color temperature of 2700K, and the third light source unit is adapted to emit greenish white light. a first light source unit and a second light source unit adapted to emit lights having different color coordinates from each other; a third light source unit adapted to emit light having a color coordinate which is different from that of the second light source unit; a sensor adapted to sense respective light quantities of an R component, a G component and a B component of light mixed with lights emitted from the first light source unit, the second light source unit and the third light source unit, and to output a first component signal, a second component signal and a third component signal, which respectively correspond to light quantities of the R component, the G component and the B component; a memory adapted to store a standard color coordinate located within an area formed by the color coordinates of the light output from the first light source unit, the second light source unit and the third light source unit; a controller adapted to receive the first component signal, the second component signal and the third component signal from the sensor, to generate a color coordinate by using tristimulus values of X, Y and Z which are calculated by using the first component signal, the second component signal and the third component signal respectively, wherein the controller is further adapted to compare the color coordinate with the standard color coordinate read from the memory, and to control light quantities of the first light source unit, the second light source unit and the third light source unit in such a manner as to reduce an error value between the standard color coordinate and the color coordinate; and a power supplier adapted to supply voltage changing the light quantities of the first light source unit, the second light source unit and the third light source unit under the control of the controller, characterized in that the first light source unit is adapted to emit light having a color temperature of 6500K, the second light source unit is adapted to emit light having a color temperature of 2700K, and the third light source unit is adapted to emit greenish white light.