JP2014222594A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system which reduces discomfort that a performer has owing to illumination light while maintaining conspicuousness of the performer etc., to an audience etc.SOLUTION: A lighting system 1 includes: two or more kinds of light source (LED) 2; a controller 3 for setting a color temperature of illumination light by the light sources 2; a control section 4 which controls outputs of the light sources 2 individually so that the illumination light reaches the color temperature set by the controller 3; and mode changeover switches 33a, 33b for switching dimming modes. The dimming modes includes a first dimming mode in which the illumination light emitted by the light sources 2 is changed, and a second dimming mode in which a conspicuousness index FCI of the illumination light emitted by the light sources 2 is changed. With this constitution, illumination light having high conspicuousness is used by a user's operation or by automatically changing the dimming modes so as to reduce discomfort that a performer has owing to the illumination light while maintaining conspicuousness of the performer etc., to an audience etc.

Description

  The present invention relates to an illumination system that changes the light distribution and wavelength components of illumination light.

  Conventionally, in a stage or a studio, an illumination system that illuminates a visual target using an illumination device such as a spotlight or a downlight that can emit high-power light to make the visual target such as a performer or set on the stage stand out. Is used.

  However, performers who are irradiated with high-power illumination light may feel discomfort such as glare and heat from heat rays. In particular, uncomfortable feeling due to illumination light impedes performance and the like for musical instruments and theater performers. Therefore, a filter that cuts infrared light emitted from a light source is known (see, for example, Patent Document 1). By arranging this filter on the light irradiation surface of the lighting device, it is possible to reduce the heat rays irradiated to the performer.

JP 2010-78714 A

  However, the illumination device of Patent Document 1 cannot reduce the discomfort of the performer due to the glare or annoyance caused by the visible light itself. However, if the output of visible light is reduced in order to reduce the discomfort of the performer, the performer or the like is not sufficiently illuminated, and the conspicuous feeling for the audience or the like cannot be obtained.

  The present invention solves the above-described problems, and an object of the present invention is to provide an illumination system that can reduce the discomfort of the performer due to illumination light while maintaining the conspicuous feeling of the performer with respect to the audience.

  In order to solve the above problems, the present invention provides two or more types of light sources having different emission spectra, an operation unit for setting a lighting state of the light source, and a lighting state set by the operation unit. And a control unit that individually controls the output of the light source, wherein the operation unit has a mode switching unit for switching a plurality of dimming modes of illumination light by the control unit. The plurality of dimming modes include a first dimming mode for changing the illuminance by the illumination light emitted from the light source, and a second dimming for changing the conspicuous index FCI of the illumination light emitted from the light source. And a mode.

  In the illuminating device, the operation unit further includes an input unit that inputs an illuminance change amount in the first dimming mode and an FCI change amount in the second dimming mode as the lighting state of the light source. Is preferred.

  In the illumination device, it is preferable that the mode switching unit switches the dimming mode in accordance with a user operation.

  The illumination device preferably further includes a sensor that detects an irradiation target, and the mode switching unit switches the dimming mode according to a detection result of the sensor.

  In the illumination device, the light source includes at least two types of white light sources having different conspicuous indices FCI of illumination light from each other, and the control unit is relatively controlled according to an operation of the operation unit in the first dimming mode. In the second dimming mode, a white light source having a relatively low conspicuous index FCI and a white having a relatively high conspicuous index FCI are changed in accordance with the operation of the operation unit. It is preferable to change the output ratio with the light source.

  According to the present invention, it is possible to switch the dimming mode by a user operation or automatically, and by using illumination light with a high degree of conspicuousness, while maintaining the conspicuous feeling of the performers and the like for the audience, etc. Discomfort can be reduced.

The block diagram of the illumination system which concerns on one Embodiment of this invention. (A) thru | or (e) is a figure which shows the variation of the operation means in the controller of the illumination system. The sectional side view of LED used for the illuminating device. The figure which shows the spectral spectrum of the light source used for the illumination system. The block diagram of the power supply unit used for the illumination system. The figure which shows the operation | movement flow of the illumination system. The figure which shows the spectral spectrum of the illumination light in each light control mode of the illumination system. The block diagram of the illumination system which concerns on the modification of the said embodiment. The figure which shows the spectral spectrum of the light source used for the illumination system. The figure which shows the spectral spectrum of the illumination light in each light control mode of the illumination system. The block diagram of the illumination system which concerns on another modification of the said embodiment.

  An illumination system according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, an illumination system 1 according to this embodiment includes a light source 2, a controller 3 (operation unit) for setting the color temperature of illumination light from the light source 2, and illumination light set by the controller 3. And a control unit 4 for individually controlling the output of the light source 2 so that the color temperature is the same. As the light source 2, two or more types of solid light emitting elements (hereinafter referred to as LEDs) having different emission spectra, and in the illustrated example, three types of LEDs 2 a, 2 b, and 2 c are used as the light source 2, and these are incorporated in the lamp 10. ing. However, the types of light sources are not limited to three, and a plurality of various LEDs may be used. Moreover, the illumination system 1 is provided with the power supply unit 5 which supplies predetermined | prescribed electric power to each LED2a-2c. As illustrated, the power supply unit 5 may have an independent configuration, or may be incorporated in either the controller 3 or the lamp 10.

  The controller 3 includes a housing 30, a cylindrical volume switch 31 (input unit) for the user to set the color temperature of the illumination light, and a power switch 32 for turning on and off the illumination system 1. The volume switch 31 is provided so as to be rotatable with respect to the housing 30, and a user can set a desired color temperature. The power switch 32 includes a tumbler switch or a push button switch, and opens and closes a power supply path from the AC power supply AC to the power supply unit 5.

  Further, the controller 3 includes mode changeover switches 33a and 33b (mode changeover units) for changing the dimming mode in the illumination system 1. The dimming mode includes a first dimming mode for changing the illuminance by the illumination light emitted from the light source 2, and a second dimming mode for changing the conspicuous index FCI of the illumination light emitted from the light source 2. It is. Here, the mode changeover switch 33a is a switch for selecting the first dimming mode, and the mode changeover switch 33b is a switch for selecting the second dimming mode. Similar to the power switch 32, these switches are tumbler switches or push button switches.

  It is known that the vividness of the color of a visual object in an illumination environment is influenced by the noticeable feeling received from the visual object. However, this conspicuous influence cannot be properly evaluated by the average color rendering index (Ra) generally used for evaluation of conventional color rendering properties. Therefore, the color rendering properties of the light source can be more appropriately evaluated in a multifaceted manner by using the conspicuity index (FCI: Feeling of contrast index) in combination with Ra (New Color Science Handbook). [3rd edition] Refer to the Japan Society for Color Science).

  FCI is an index that represents the degree of color reproduction conspicuousness and vividness, and is defined by the following equation (1).

Ｇ_ＬＡＢ（Ｔ）：テスト光源下での赤・青・緑・黄の４色配色サンプルのＬＡＢ表色系における色域面積
Ｇ_ＬＡＢ（Ｄ６５）：基準光源Ｄ６５下での同４色配色サンプルのＬＡＢ表色系における色域面積

G _LAB (T): Color gamut area in the LAB color system of the red, blue, green, yellow four-color color sample under the test light source G _LAB (D65): The same four-color color sample under the reference light source D65 Color gamut area in LAB color system

That is, the conspicuous index FCI is a value defined by the above formula (1). That is, the FCI uses the color gamut area in the LAB color system of the red, blue, green, and yellow color samples under the test light source as G _LAB (T), and the same four color sample under the reference light source D65. When the color gamut area in the LAB color system is G _LAB (D65), it is expressed by [G _LAB (T) / G _LAB (D65)] ^1.5 × 100. The FCI is 100 for the reference light source D65, and a light source having an FCI greater than 100 makes the space appear brighter and more brightly rendered than the reference light source D65.

  The control unit 4 is built in the housing 30 of the controller 3 and generates a DC voltage signal from the correlated color temperature set by operating the volume switch 31.

  In FIG. 1, a rotary volume switch 31 is illustrated as an operation unit by the user, but the operation unit may have another configuration as long as the user can set a desired color temperature. For example, as shown in FIG. 2 (a), the fader may be slid in the vertical direction, as shown in FIG. 2 (b), when the high / low button is pressed, as shown in FIG. 2 (c), A multistage switch associated with a predetermined color temperature may be used. Further, as shown in FIG. 2D, a rotary volume switch and a multistage switch may be combined, and as shown in FIG. 2E, a color temperature value is input. May be. Furthermore, the above-described buttons and faders may be displayed on the touch panel and expressed by colors corresponding to the set color temperature. The display may be characters or colors such as orange or blue. Further, the controller 3 may be provided with a display unit (not shown) for displaying the setting state of each switch described above, and this display unit imitates the shape of a person or an object as well as numbers and symbols. A graphic may be displayed.

  As shown in FIG. 3, the light source 2 (LEDs 2 a to 2 c) has a base 20 having a rectangular cross section, a light emitting unit (LED chip) 21 mounted on the base 20, and a recess surrounding the LED chip 21. A frame 22 and a filler 23 filled in the frame 22 are provided. The filler 23 is made of silicon or the like, and contains phosphors 24 a and 24 b that convert the wavelength of light emitted from the LED chip 21. In the example shown in the figure, two types of phosphors 24a and 24b are used. However, the types of the phosphors are not limited to two, and the light emitted from the light source 2 is appropriately set so as to have an emission spectrum described later. Adjusted.

  A cathode electrode 25 is provided on one side surface of the substrate 20, and an anode electrode 26 is provided on the other side surface, which are connected to external connection electrodes 27 and 28 formed at both ends of the lower surface of the substrate 20. Further, the cathode electrode 25 and the anode electrode 26 are connected to respective electrode terminals (not shown) of the LED chip 21 by wires 29. The inner peripheral surface of the frame 22 is formed as a conical surface that opens in the light-derived direction, and the surface of the conical surface has a light reflecting function.

The LED chip 21, particularly the LED 2a, is preferably a blue LED element that emits blue light. By adjusting the type or content of the phosphors 24a and 24b, light having a desired chromaticity can be obtained. An emitting LED is obtained. The chromaticity coordinates of the light colors of the LEDs 2a, 2b, 2c shown in FIG. 1 are (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ), respectively, and the LEDs 2a, 2b , 2c are Y ₁ , Y ₂ , and Y ₃ , respectively, the chromaticity coordinates (x ₀ , y ₀ ) and the light amount Y ₀ of the illumination light that is mixed color light are expressed by the following equation (2). expressed. Then, LED 2 a, 2b, by varying the ratio of the amount _{Y 1,} Y 2, _{Y 3} of 2c, it is possible to change the chromaticity of the illumination light obtained as a mixed color light.

  In addition to or in place of the phosphors 24a and 24b, a filter (not shown) that converts the wavelength of light emitted from the LEDs 2a to 2c by selectively transmitting light having a predetermined wavelength may be used. . This filter may be provided on a protective cover (not shown) of the lamp 10. Further, the LEDs 2 to 2 c are provided with a lens member (not shown) for appropriately controlling the light distribution of the emitted light, and the phosphor 24 or the filter described above is attached to this lens member or the LED 2 and the lens member. It may be incorporated in between.

  As described above, the LEDs 2a to 2c are configured to have different emission spectra. In this embodiment, a BY white LED combining a blue LED chip and a YAG yellow phosphor is used for the LED 2a, a gallium nitride green LED for the LED 2b, and an AlGaP based LED for the LED 2c. A red LED is used. FIG. 4 shows the spectrum of the emitted light from these LEDs 2a-2c. The LED 2a includes a wavelength component caused by light emission of the blue LED chip itself and a wavelength component caused by converted light by the YAG phosphor. It is assumed that the FCI by the emitted light of the LED 2a used in this embodiment is 108, and the correlated color temperature is 3000K. Moreover, LED2b, 2c has the peak wavelength of the green color and red color resulting from light emission of each LED itself, respectively. It is assumed that the FCI by the mixed color light of the LEDs 2b and 2c used in this embodiment is 132 and the correlated color temperature is 3000K.

  As shown in FIG. 5, the power supply unit 5 includes a control signal input unit 51 to which a control signal from the controller 3 is input, and an AC / DC conversion unit that converts an AC voltage fed through the controller 3 into a desired DC voltage. 52. In addition, the power supply unit 5 drives the first to third LED driving signals supplied to the first to third LED driving units 53a to 53c and the control signal input unit 51 for driving the LEDs 2a to 2c (see FIG. 1). And a drive signal conversion unit 54 that converts the drive signals output to the units 53a to 53c. The drive signal converter 54 outputs a drive signal composed of a rectangular wave signal having a constant cycle with a variable on-duty ratio, thereby switching the switching elements (not shown) of the first to third LED drive units 53a to 53c to PWM (not shown). The amount of power supplied to the LEDs 2a to 2c is adjusted by controlling (pulse width modulation).

In the power supply unit 5, the control signal output from the control signal generation unit of the controller 3 is converted into a DC voltage signal having a voltage level corresponding to the on-duty ratio (color temperature) by the control signal input unit 51. The direct-current voltage signal is converted into a drive signal for the first to third LED drive units 53 a to 53 c by the drive signal conversion unit 54. The drive signal converter 54 includes a microcomputer and a memory. In this memory, the signal level (color temperature) of the DC voltage signal, the chromaticity coordinates (x ₀ , y ₀ ) of the light color of the illumination light corresponding to the set color temperature, and each LED 2a corresponding to the chromaticity coordinates A conversion table representing the ratios of the light amounts Y ₁ , Y ₂ , Y ₃ of ˜2c and their corresponding relationships is stored. The microcomputer converts the DC voltage signal into a drive signal based on a conversion table stored in the memory.

  The operation of the illumination system 1 configured as described above will be described with reference to FIGS. 6 and 7 in addition to FIG. 1 described above. First, when the user presses the power switch 32 to turn on the system, the LED 2a is lit (S1 in FIG. 6). When the user changes the conspicuous index FCI (Yes in S2), the user selects one of the mode changeover switches 33a and 33b and selects the dimming mode of the illumination system 1. For example, when the user presses the mode switch 33a to select the first dimming mode and then operates the volume switch 31 (S3), the control unit 4 determines the amount of change in the output of the LED 2a according to the operation amount. After determination (S4), the illuminance of the illumination light from the lamp 10 is changed. In this first dimming mode, only the LED 2a is lit, so the spectral spectrum of the illumination light has two peaks due to the emitted light of the blue LED chip and the converted light by the YAG phosphor as shown in FIG. Is seen.

  When the user presses the mode switch 33b to select the second dimming mode and then operates the volume switch 31 (S3 in FIG. 6), the control unit 4 changes the set FCI according to the operation amount. The amount is determined (S5). And the control part 4 determines the output ratio of LED2a-2c so that it may become FCI by which FCI of those mixed-color light was set, without changing the total output of LED2a-2c (S6). For example, as described above, when the FCI of the emitted light from the LED 2a is 108 and the FCI of the mixed color light of the LEDs 2b and 2c is 132, and the volume switch 31 is set to a low FCI, the output of the LED 2a is If the output of the LEDs 2b and 2c is high and the volume switch 31 is sequentially set to a high FCI, the output of the LED 2a is reduced and the output of the LEDs 2b and 2c is increased according to the operation. In this way, the FCI can be controlled in the range of 108 to 132 without changing the output of the illumination light. In this case, by changing from the low FCI to the high FCI, an effect of increasing the noticeable feeling equivalent to that when the illuminance is increased by about 1.2 times can be obtained. In the second dimming mode, the LEDs 2a to 2c are turned on according to the FCI. Therefore, in the spectrum of the illumination light, as shown in FIG. 7, the emitted light of the LED 2a that is a white LED chip, the LED 2b that is a green LED And the light emitted from the LED 2c, which is a red LED, are mixed. When the FCI is set to the highest value, there is no peak due to the light emitted from the LED 2a that is the white LED chip, and the light emitted from the LED 2b that is the green LED and the light emitted from the LED 2c that is the red LED. The peak to be increased.

  As described above, the user can easily change the lighting state in the lighting system 1 by selecting the dimming mode by the mode change-over switches 33a and 33b and using the volume switch 31 (S7). . When the power switch 32 is in the on state (No in S8), the user can make the above changes at any time. When the power switch 32 is turned off, the lamp 10 of the lighting system 1 is turned off (in S8). Yes). At this time, the memory (not shown) of the control unit 4 stores the lighting state before turning off, and lights up according to the stored lighting state when the power switch 32 is turned on next time.

  According to the present embodiment, in the first dimming mode, it is possible to save energy by turning on the LED 2a composed of a white LED with good light emission efficiency. In the second dimming mode, the conspicuousness of the irradiation target can be enhanced by changing the FCI of the illumination light without changing the illuminance of the output light. And the user can switch the light control mode according to irradiation object. For example, in the case of illuminating a person, by setting the second dimming mode, it is possible to reduce the uncomfortable feeling of the performer due to the illumination light while maintaining the conspicuous feeling of the performer with respect to the audience. In this way, by switching the dimming mode according to the state of the illumination space and using highly conspicuous illumination light, it is possible to save energy, while maintaining the conspicuous feeling of the performers etc. for the audience, etc. The discomfort of the performer due to light can be reduced.

  The volume switch 31 is an input unit that inputs both the amount of change in illuminance in the first dimming mode and the amount of change in FCI in the second dimming mode, depending on the operation status of the mode selector switches 33a and 33b. Function. Therefore, the configuration of the controller 3 can be simplified and the operability for the user can be improved.

  Next, an illumination system according to a modification of the above embodiment will be described with reference to FIGS. As shown in FIG. 8, the illumination system 1 of the present modification includes two types of LEDs 2 a and 2 b as the light source 2. These LEDs 2a and 2b are both white light sources, and are configured such that the FCI of the illumination light is different from each other. FIG. 9 shows these spectral spectra. Here, it is assumed that the FCI of the illumination light of the LED 2a is relatively low and the FCI of the illumination light of the LED 2b is relatively high. In the first dimming mode, the control unit 4 changes the output of the LED 2a having a relatively low FCI according to the operation of the volume switch 31. On the other hand, in the second dimming mode, the output ratio between the LED 2a white light source having a relatively low FCI and the LED 2b having a relatively high FCI is changed according to the operation of the volume switch 31. FIG. 10 shows the spectrum of each of these modes.

  In this modification, for example, a BY white LED that combines a blue LED chip and a YAG yellow phosphor is used as the LED 2a having a relatively high FCI, and the emitted light has an FCI of 100. The color temperature is set to 3000K. The LED 2b having a relatively high FCI uses, for example, a white LED in which a blue LED chip is combined with a BOSE green phosphor and a CASN red phosphor. The emitted light has an FCI of 150, a correlated color. The temperature is set to 3000K. Note that a neodymium type LED may be used as the LED 2b. Other configurations in the present modification are the same as those in the above embodiment.

  Here, the change in output in each dimming mode according to the operation amount of the volume switch 31 in the present modification will be described. The illuminance (direct illuminance) measured immediately below the lamp 10 of each outgoing light output from the LED 2a and LED 2b is defined as x lux and y lux, respectively. In this case, the FCI of the mixed color light output from the LEDs 2a and 2b is (100x + 150y) / (x + y), and the illuminance immediately below the mixed color light is (x + y) lux. The conspicuous feeling of the mixed color light at this time corresponds to the conspicuous feeling of the lux represented by the following formula (3), as compared with the LED 2a having FCI of 100.

  That is, when the user operates the volume switch 31 in the second dimming mode to increase the conspicuousness by 1.2 times, the control unit 4 determines that the value of (100x + 150y) / (x + y) The output ratio of the LED 2a and the LED 2b is determined so as to be 1.2 times and the value of (x + y) does not change.

  Here, a more specific operation example of this modification will be described with reference to Tables 1 and 2 below. Table 1 shows the operation amount of the volume switch 31 in the first dimming mode, the illuminance, the FCI, and the outputs of the light sources (LEDs 2a and 2b).

  In the first dimming mode, the lighting output of the LED 2a having a relatively low FCI is controlled according to the operation amount of the volume switch 31. Thereby, similarly to the said embodiment, energy saving can be achieved by lighting LED2a comprised from white LED with sufficient luminous efficiency.

  Table 2 shows the operation amount of the volume switch 31 in the second dimming mode, the illuminance, the FCI, and the outputs of the light sources (LEDs 2a and 2b).

  In the second dimming mode, the conspicuousness of the irradiation target can be enhanced by changing the FCI of the illumination light by controlling the output ratio of the LEDs 2a and 2b without changing the illuminance. In the above embodiment, since the three types of LEDs 2a to 2c are used, the variable range of the chromaticity of the illumination light can be widened, but the control unit 4 needs to control the three types of output ratios. Dimming control and wiring of the lamp 10 are complicated. On the other hand, in this modification, since there are two types of light sources, dimming control and the like in the control unit 4 can be simplified. The illuminance in the second dimming mode is not limited to the above-described 1000 Lx, and can be arbitrarily set. For example, the illuminance is controlled according to the illuminance set in the first dimming mode.

  Next, an illumination system according to another modification of the above embodiment will be described with reference to FIG. As shown in FIG. 11, the illumination system 1 of the present modification further includes a sensor 34 that detects an irradiation target. Then, the dimming mode is switched according to the detection result of the sensor 34. That is, the sensor 34 functions as a signal output unit for the mode switching unit. As the sensor 34, for example, a pyroelectric sensor that detects the presence or absence of a person is used. The detection area of the sensor 34 is set to be equivalent to the illumination light irradiation range by the lamp 10. In FIG. 11, the sensor 34 is shown as a different configuration from the lamp 10, but the sensor 34 may be incorporated in the lamp 10. In addition to the pyroelectric sensor, the sensor 34 may be a CMOS sensor, a thermal image sensor, or the like. Furthermore, a display part (not shown) may be provided in the controller 3, and the detection result of the sensor 34 may be displayed on this display part.

  In the said embodiment and modification, the user switched the light control mode of the illumination system 1 manually using the mode change-over switches 33a and 33b of the controller 3. On the other hand, in this modification, for example, when the sensor 34 detects a person, the dimming mode of the lighting system 1 is switched from the first dimming mode to the second dimming mode, while the detection by the sensor 34 is performed. When there is not, the mode is switched from the second dimming mode to the first dimming mode.

  According to this modified example, the user simply adjusts the degree of conspicuousness with the volume switch 31 in advance, and the dimming mode is automatically switched according to the object. When there is a person such as a performer in the irradiation area, the troublesome light felt by the performer can be reduced by maintaining the conspicuous feeling by entering the second dimming mode.

  In addition, this invention is not restricted to the said embodiment, A various deformation | transformation is possible. In the above-described embodiment and each modification, the operation example in which the dimming mode has two types has been described. However, the dimming curve in which the illuminance and the conspicuous index are correlated with the operation amount in the volume switch 31 is made to be relative to each other. A further dimming pattern in which both the illuminance and the conspicuous index are variable may be used. Moreover, as a structure of a light source, regarding the realization of the spectral distribution of each LED, the combination of phosphors is not limited to the exemplified one. Further, the types of LEDs and the combinations thereof are not limited to the numbers and combinations shown in the embodiments, but may be any as long as the correlation color temperature change and the conspicuous index FCI can be maintained. Furthermore, the light source is not limited to the LED, and may be another light source such as an incandescent lamp, a fluorescent lamp, and an organic EL as long as the chromaticity and illuminance are variable.

1 Illumination system 2 Light source 2a, 2b, 2c LED
3 Controller (operation unit)
31 Volume controller (input unit)
33a, 33b Mode selector switch (mode selector)
34 Sensor (component of mode switching unit)
4 Control unit

Claims (5)

Two or more types of light sources having different emission spectra, an operation unit for setting a lighting state of the light source, and an output of the light source are individually controlled so as to obtain a lighting state set by the operation unit A lighting system comprising a control unit,
The operation unit has a mode switching unit for switching a plurality of dimming modes of illumination light by the control unit,
The plurality of dimming modes include a first dimming mode for changing the illuminance by illumination light emitted from the light source, and a second dimming mode for changing the conspicuous index FCI of the illumination light emitted from the light source. A lighting system comprising:   The operation unit further includes an input unit configured to input an illuminance change amount in the first dimming mode and an FCI change amount in the second dimming mode as a lighting state of the light source. Item 2. The lighting system according to Item 1.   The illumination system according to claim 1 or 2, wherein the mode switching unit switches the dimming mode according to a user operation. A sensor for detecting an irradiation target;
The illumination system according to claim 1, wherein the mode switching unit switches the dimming mode according to a detection result of the sensor. The light source includes at least two types of white light sources having different conspicuous indices FCI of illumination light from each other,
In the first dimming mode, the control unit changes the output of the white light source having a relatively low conspicuous index FCI in accordance with the operation of the operation unit. In the second dimming mode, the control unit operates the operation unit. 5. The illumination system according to claim 1, wherein an output ratio between a white light source having a relatively low conspicuous index FCI and a white light source having a relatively high conspicuous index FCI is changed in accordance with.

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