Illumination apparatus and illumination control system

1. An illumination apparatus, comprising:

a light emitter which emits first illumination light that is illumination light for illuminating a display screen,

wherein, in a u′v′ chromaticity diagram which is a CIE 1976 uniform chromaticity scale diagram, the first illumination light has a correlated color temperature in a range from 4000 K to 5800 K, and u′v′ chromaticity coordinates in a range which satisfies 0.7125u′+0.3284<v′<0.7125u′+0.3339, and

wherein the first illumination light is emitted onto the display screen.

2. The illumination apparatus according to claim 1 , wherein

the light emitter includes:

a first white light emitting diode (LED) light source which emits first white light having a correlated color temperature in a range from 5000 K to 7200 K; and

a second white LED light source which emits second white light having a correlated color temperature in a range from 2700 K to 3800 K, such that the first white light and the second white light form the first illumination light.

3. The illumination apparatus according to claim 1 , wherein

the light emitter includes:

a white LED light source which emits white light having a correlated color temperature in a range from 5000 K to 7200 K; and

a red LED light source which emits red light having a main peak wavelength in a range from 600 nm to 650 nm, such that the white light and the red light form the first illumination light.

4. The illumination apparatus according to claim 1 , wherein

the light emitter includes:

a first white LED light source which emits first white light having a correlated color temperature in a range from 5000 K to 7200 K;

a second white LED light source which emits second white light having a correlated color temperature in a range from 2700 K to 3800 K; and

a red LED light source which emits red light having a main peak wavelength in a range from 600 nm to 650 nm, such that the first white light, the second white light, and the red light form the first illumination light.

5. The illumination apparatus according to claim 1 , wherein

the light emitter includes:

a white LED light source which emits white light having a correlated color temperature in a range from 5000 K to 7200 K;

a red LED light source which emits red light having a main peak wavelength in a range from 600 nm to 640 nm; and

a green LED light source which emits green light having a main peak wavelength in a range from 480 nm to 500 nm, such that the white light, the red light and the green light form the first illumination light.

6. The illumination apparatus according to claim 5 , wherein

the red LED light source and the green LED light source are directly adjacent to each other.

7. The illumination apparatus according to claim 1 , wherein

the light emitter further emits second illumination light that is illumination light for illuminating paper, and

optical characteristics of the second illumination light include:

a correlated color temperature in a range from 5400 K to 7000 K;

a color deviation Duv in a range from −6 to 8; and

a chroma value of at most 2.0, the chroma value being obtained using a calculation method specified in the CIE 1997 Interim Color Appearance Model (Simple Version).

8. The illumination apparatus according to claim 7 , further comprising:

a controller which switches between a first mode for emitting the first illumination light and a second mode for emitting the second illumination light.

9. The illumination apparatus according to claim 1 , further comprising:

a controller which controls the light emitter.

10. The illumination apparatus according to claim 1 , further comprising:

a base which supports the light emitter; and

a light-transmitting cover which covers the light emitter.

11. The illumination apparatus according to claim 10 , wherein

the light-transmitting cover has diffusibility.

12. The illumination apparatus according to claim 1 , further comprising:

a controller which controls the light emitter, wherein:

the controller controls the light emitter to cause the first illumination light to have a constant correlated color temperature in a range from 4000 K to 5000 K during a first time period from a predetermined time in morning to around 3:00 p.m.,

the controller controls the light emitter to cause the first illumination light to have a correlated color temperature which increases in a range from 5000 K to 5800 K as time elapses during a second time period from around 3:00 p.m. to sunset, and

the controller controls the light emitter to cause the first illumination light to have a constant color in a range from 4000 K to 5000 K during a third time period from sunset to a predetermined time in night.

13. The illumination apparatus according to claim 12 , wherein

a horizontal illuminance of the first illumination light in the predetermined space is at most 1000 lx.

14. The illumination apparatus according to claim 12 , further comprising:

a light color detector which detects a light color, wherein the controller controls the light emitter, based on the light color detected by the light color detector, to cause the first illumination light to have a color according to color tuning control schedule information predetermined.

15. The illumination apparatus according to claim 14 , further comprising:

a storage which stores the color tuning control schedule information.

16. An illumination control system, comprising:

an illumination apparatus comprising:

a light emitter which emits first illumination light that is illumination light for illuminating a display screen, wherein, in a u′v′ chromaticity diagram which is a CIE 1976 uniform chromaticity scale diagram, the first illumination light has a correlated color temperature in a range from 4000 K to 5800 K, and u′v′ chromaticity coordinates in a range which satisfies 0.7125u′+0.3284<v′<0.7125u′+0.3339, and wherein the first illumination light is emitted onto the display screen;

a controller which controls the light emitter, wherein:

the controller controls the light emitter to cause the first illumination light to have a constant correlated color temperature in a range from 4000 K to 5000 K during a first time period from a predetermined time in morning to around 3:00 p.m.,

the controller controls the light emitter to cause the first illumination light to have a correlated color temperature which increases in a range from 5000 K to 5800 K as time elapses during a second time period from around 3:00 p.m. to sunset, and

the controller controls the light emitter to cause the first illumination light to have a constant color in a range from 4000 K to 5000 K during a third time period from sunset to a predetermined time in night;

a light color detector which detects a light color, wherein the controller controls the light emitter, based on the light color detected by the light color detector, to cause the first illumination light to have a color according to color tuning control schedule information predetermined; and

a storage which stores the color tuning control schedule information; and

an operation input controller which operates the illumination apparatus, wherein the color tuning control schedule information is created according to a user operation on the operation input controller, and stored into the storage.

17. An illumination control system comprising:

a plurality of illumination apparatuses each of which comprises a light emitter which emits first illumination light that is illumination light for illuminating a display screen, wherein:

in a u′v′ chromaticity diagram which is a CIE 1976 uniform chromaticity scale diagram, the first illumination light has a correlated color temperature in a range from 4000 K to 5800 K, and u′v′ chromaticity coordinates in a range which satisfies 0.7125u′+0.3284<v′<0.7125u′+0.3339,

the first illumination light is emitted onto the display screen,

the plurality of illumination apparatuses each include an illuminance detector which detects an illuminance in a predetermined space, and

a controller included in a first illumination apparatus changes output of the first illumination light emitted by the light emitter included in the first illumination apparatus, to cause an illuminance in the predetermined space detected by the illuminance detector included in the first illumination apparatus to match an illuminance in the predetermined space detected by the illuminance detector included in a second illumination apparatus different from the first illumination apparatus, the first illumination apparatus and the second illumination apparatus being included in the plurality of illumination apparatuses.

18. An illumination control system, comprising:

an illumination apparatus comprising a light emitter which emits first illumination light that is illumination light for illuminating a display screen; and

an operation input controller which receives input to operate the illumination apparatus,

wherein, in a u′v′ chromaticity diagram which is a CIE 1976 uniform chromaticity scale diagram, the first illumination light has a correlated color temperature in a range from 4000 K to 5800 K, and u′v′ chromaticity coordinates in a range which satisfies 0.7125u′+0.3284<v′<0.7125u′+0.3339, and

wherein the first illumination light is emitted onto the display screen.

19. The illumination control system according to claim 18 , wherein:

the illumination apparatus comprises a plurality of illumination apparatuses, and

the operation input controller operates the plurality of illumination apparatuses.