ILLUMINATION APPARATUS CAPABLE OF ADJUSTING COLOR TEMPERATURE AND BRIGHTNESS AND ILLUMINATION SYSTEM COMPRISING THE SAME

PURPOSE: A lighting device and a lighting system including the same are provided to control a color temperature and brightness of a first optical source and a second optical source by determining a duty of a PWM(Pulse Width Modulation) control pulse from a color temperature set value and a brightness set value. CONSTITUTION: A lighting system includes a controller(20) and a light device(10). The controller generates a color temperature set value and a brightness set value by an operation of a user. A lighting device includes first and second optical sources(11,12), first and second PWM drivers(13,14), and a duty controller(15). The first and second optical sources emit the light with different color temperatures. The first and second PWM drivers drive the first and second optical sources with a PWM control method. A duty controller controls the duty of a PWM control pulse of the first and second PWM drivers according to the color temperature set value and the brightness set value.