Patent ID: 8411025

Claim:
A lighting apparatus comprising: a light source unit which includes an LED (light emitting diode); a first optical exciter and a second optical exciter converting lights emitted from the light source unit into lights having different color temperatures from each other and different color coordinates from each other; a third optical exciter emitting light having a color coordinate and a color temperature which are different from those of the light converted by the second optical exciter; a sensor outputting a first component signal, a second component signal, and a third component signal, wherein the first component signal corresponds to a light quantity of a first component of the light output from the first optical exciter, the second component signal corresponds to a light quantity of a second component of the light output from the second optical exciter, and the third component signal corresponds to a light quantity of a third component of the light output from the third optical exciter; a controller controlling light quantity of the light source unit such that a color coordinate of the light emitted from the first optical exciter, a color coordinate of the light emitted from the second optical exciter, and a color coordinate of the light emitted from the third optical exciter are placed within an area formed by the color coordinates of the first optical exciter, the second optical exciter, and the third optical exciter; a power supplier supplying voltage changing the light quantity of the light source unit under the control of the controller; and a memory having standard color coordinates located within an area formed by the color coordinates of the light output from the first optical exciter, the second optical exciter, and the third optical exciter, wherein the controller receives the first component signal, the second component signal, and the third component signal from the sensor, generates a comparative color coordinate, compares the comparative color coordinate with a standard color coordinate read from the memory, and controls light quantity of the light source unit in such a manner as to reduce an error value between the standard color coordinate and the comparative color coordinate.