Light emitting device, illuminating system, and illuminating method

There are provided a light emission apparatus capable of suppressing reduction in inappropriate luminous flux due to the adjustment of the color temperature while ensuring excellent color rendering properties, capable of controlling the emission intensity and the color temperature so as to generate the light with a color temperature appropriate for the desired emission intensity, and capable of suppressing manufacturing costs, and an illumination system using the light emission apparatus. Further, there is also provided an illumination method capable of emitting the light with the color temperature appropriate for the desired emission intensity by controlling the emission intensity and the color temperature while suppressing manufacturing costs of the light emission apparatus. The light emission apparatus includes: a wiring board (2); a plurality of LED chips (3) that are disposed on an LED chip mounting surface of the wiring board and are grouped into a plurality of LED groups; a wavelength conversion member (5) that is disposed at a position corresponding to the LED chip mounting surface of the wiring board (2), converts a wavelength of light emitted by the corresponding LED chips (3), and emits first-order light with a different color temperature for each wavelength conversion region; a current supply section (15) that supplies a driving current to the LED chips (3) independently for each LED group through the wiring board (2); and a control section (16) that controls the current amount supplied for each LED group in response to a control signal which is input from outside. The control section (16) independently controls timing of starting to light the LED groups in accordance with the light control level.