Lighting device

Abstract

To make chromaticity of illumination light suitable for an object without replacing an illumination device according to the object.SOLUTION: The display device includes at least a first light-emitting device (R), a second light-emitting device (GYw), and a third light-emitting device (WP) which emit light of different chromaticities, respectively, and includes an interface which controls a light amount ratio of light emission of the respective light-emitting devices to select a light emission color of a specific chromaticity in a selectable chromaticity region (MT, FS, VG, DT1, DT2, NR) which is a part of an entire region (R-GYw-WP) surrounded by chromaticities of the first light-emitting device (R), the second light-emitting device (GYw), and the third light-emitting device (WP) and does not include chromaticities of the respective light-emitting devices.SELECTED DRAWING: Figure 24

Description

[Technical Field]

[0001] The present invention relates to a lighting device that makes objects such as food look attractive. [Background technology]

[0002] The appearance of colors of objects such as food, clothing, and automobile bodies changes depending on the lighting. The appearance of a product's color is extremely important in terms of customer appeal, and lighting devices have been proposed to make products look more attractive. For example, Patent Document 1 describes a lighting device that makes meat look more vibrant.

[0003] Typically, a lighting device with lighting light appropriate for each product is installed for each product. In such cases, it was necessary to replace the lighting device when replacing the product. Patent Document 2 claims that by using a first light source with a warm color system in which the spectral components of blue, red, and green light are mixed in a predetermined ratio, a second light source with a high color temperature in which the spectral components of blue, red, and green light are mixed in a ratio different from that of the first light source, and a third light source that has only a blue spectral component, it is possible to irradiate optimal light for each food ingredient without having to change light sources for each food ingredient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-127855 [Patent Document 2] Patent No. 5507148 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, to achieve the goal of "making the redness of meat look more vivid," as in Patent Document 1, it is desirable to emphasize the "red" color. However, when trying to achieve this using the method of combining "warm color light, high color temperature light, and blue light" as in Patent Document 2, the "blue" is added to emphasize the red color of the meat, which results in a color that is slightly on the blue side, making the redness of the meat less appealing.

[0006] Therefore, an object of the present invention is to provide a lighting device that can change the light emitted from a different object to an optimum light that makes the object look attractive. [Means for solving the problem]

[0007] The present invention provides a lighting device comprising at least a first light-emitting element, a second light-emitting element, and a third light-emitting element, each of which emits light of different chromaticities, and an interface for selecting an emitted color of a specific chromaticity by controlling the light intensity ratio of the light emitted by each of the light-emitting elements, The interface controls the light intensity ratio of each of the light-emitting elements to select an emission color of a specific chromaticity within a selectable chromaticity area that is a part of the overall area surrounded by the chromaticity of the first light-emitting element, the chromaticity of the second light-emitting element, and the chromaticity of the third light-emitting element, and does not include the chromaticity of each of the light-emitting elements.

[0008] In the present invention, the selectable chromaticity area comprises a plurality of object group corresponding chromaticity areas, The user may be able to use the interface to select one of the object group corresponding chromaticity regions and then select the emission color of the particular chromaticity from the object group corresponding chromaticity region.

[0009] In the present invention, the selectable chromaticity area is: a point on a line connecting the chromaticity of the first light-emitting element and the chromaticity of the second light-emitting element that is 20% away from the first light-emitting element, the length of the line being 100%; The length of the line connecting the chromaticity of the first light-emitting element and the chromaticity of the third light-emitting element may be 100%, and the line connecting the point 20% from the first light-emitting element on that line may not include the side closer to the first light-emitting element.

[0010] In the present invention, the selectable chromaticity area is: a point on a line connecting the chromaticity of the first light-emitting element and the chromaticity of the second light-emitting element that is 50% away from the first light-emitting element, the length of the line being 100%; A line connecting the chromaticity of the first light-emitting element and the chromaticity of the third light-emitting element may intersect with a point that is 50% from the chromaticity of the first light-emitting element, assuming that the length of the line connecting the chromaticity of the first light-emitting element and the chromaticity of the third light-emitting element is 100%.

[0011] In the present invention, the chromaticity of the third light-emitting element may be within a range surrounded by chromaticity coordinates of (0.288, 0.213), (0.327, 0.255), (0.312, 0.285), and (0.264, 0.232).

[0012] In the present invention, the chromaticity of the second light-emitting element may be within a range surrounded by chromaticity coordinates of (0.374, 0.418), (0.368, 0.494), (0.321, 0.449), and (0.324, 0.377).

[0013] In the present invention, the chromaticity of the first light-emitting element may be within a range surrounded by chromaticity coordinates of (0.575, 0.424), (0.517, 0.348), (0.685, 0.239), and (0.736, 0.264).

[0014] The present invention provides a lighting device that includes a first light-emitting element, a second light-emitting element, and a third light-emitting element that emit light of different chromaticities, and that is capable of controlling the light intensity ratio of the first light-emitting element, the second light-emitting element, and a third light-emitting element that emits light of different chromaticities, the lighting device comprising: the first light-emitting element, the second light-emitting element, and the third light-emitting element all have a correlated color temperature of 2000 K or more and 6000 K or less; The lighting device is such that the difference in color deviation Duv between the one with the largest color deviation Duv and the one with the smallest color deviation Duv among the first light-emitting element, the second light-emitting element, and the third light-emitting element is 10 or more and 50 or less.

[0015] In the present invention, the first light emitting element, the second light emitting element, and the third light emitting element may each have a color deviation Duv of not less than −50 and not more than +20.

[0016] In the present invention, the spectra of the first light-emitting element, the second light-emitting element, and the third light-emitting element may further have a maximum value in a wavelength range of 570 nm or more and 600 nm or less that is 0.25 or more relative to the maximum value in a wavelength range of 490 nm or more and 570 nm or less.

[0017] The present invention further provides a fourth light-emitting element having a correlated color temperature of 2000 K or more and 6000 K or less and a color deviation Duv of -50 or more and +20 or less, The light intensity ratio between the first light emitting element, the second light emitting element, the third light emitting element, and the fourth light emitting element may be controllable. [Effects of the Invention]

[0018] In the present invention, the illumination light of the object illumination device can be controlled to a chromaticity that corresponds to the object, thereby making the object appear in a desired color.

[0019] Furthermore, in the present invention, the user can quickly select an appropriate chromaticity as the chromaticity of the illumination light of the object illumination device. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram illustrating a configuration of a lighting system including the lighting device according to the first embodiment. [Figure 2] Inside the lighting body of the lighting device of embodiment 1 [Figure 3] 1 is a plan view of a light source used in the lighting device of the first embodiment; [Figure 4]Chromaticity diagram of three-color LEDs used in the lighting device of embodiment 1 [Figure 5] Spectral diagram of LEDs (D, F) used in the lighting device of embodiment 1 [Figure 6] Spectral diagram of LEDs (D, E) used in the lighting device of embodiment 1 [Figure 7] Chromaticity diagram (full chromaticity range) of the three-color LED used in the lighting device of embodiment 1 [Figure 8] Schematic diagram to explain color unevenness [Figure 9] An explanatory diagram of a straight tube LED used in a refrigerated showcase in embodiment 2. [Figure 10] Schematic plan view of a printed circuit board installed inside a straight tube LED of embodiment 2 [Figure 11] 10 is a diagram showing the configuration of a lighting device according to a third embodiment of the present invention; [Figure 12] FIG. 10 is an exploded perspective view of a lamp body of the lighting device according to the third embodiment. [Figure 13] Chromaticity diagram of four-color LEDs used in the lighting device of embodiment 3 [Figure 14] Synthetic spectrum obtained with the lighting device of embodiment 3 [Figure 15] chromaticity diagram for explaining the chromaticity of the light-emitting element in the lighting device of embodiment 4; [Figure 16] Ingredient group selection interface in the lighting control device of embodiment 4 [Figure 17] 10 is a chromaticity diagram showing the chromaticity region when the foodstuff group "meat" is selected in the lighting control device of embodiment 4. [Figure 18] A color selection interface displayed after selecting a food ingredient group in the lighting control device of the fourth embodiment. [Figure 19] An interface that allows selection of food group and color selection according to food group on one screen in the lighting control device of embodiment 4 [Figure 20] 10 is a chromaticity diagram showing the chromaticity region when the food ingredient group "fresh fish" is selected in the lighting control device of embodiment 4. [Figure 21]10 is a chromaticity diagram showing the chromaticity region when the food ingredient group "fruit and vegetables" is selected in the lighting control device of embodiment 4. [Figure 22] 10 is a chromaticity diagram showing a chromaticity region when the food ingredient group "prepared dishes" is selected in the lighting control device of embodiment 4. [Figure 23] 10 is a chromaticity diagram showing the chromaticity region when the food group "natural" is selected in the lighting control device of embodiment 4. [Figure 24] 10 is a chromaticity diagram showing the chromaticity range of foodstuff groups and the chromaticity range not included in that chromaticity range in the lighting control device of embodiment 4. [Figure 25] 10 is a chromaticity diagram showing a chromaticity range suitable for a light-emitting element in the lighting control device of embodiment 4. [Figure 26] A spectrum diagram of the combined light emitting elements 1, 2, and 3 in the lighting device of embodiment 4. [Figure 27] 10 is a spectrum diagram of the light-emitting element 3 in the lighting device of the fourth embodiment. [Figure 28] 10 is a spectrum diagram of the light-emitting element 2 in the lighting device of the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] <Embodiment 1> <Basic configuration> 1 shows a configuration diagram of a lighting system including a lighting device 300 according to this embodiment. The lighting device 300 is a spotlight, and comprises a lamp body 360, a power supply unit 380, and an arm 375 that connects the lamp body 360 to the power supply unit 380.

[0022] <Light body> 2 is an explanatory diagram showing the interior of the lamp body 360 surrounded by a frame 367. The lamp body 360 comprises a heat sink 364, a light source 320 mounted thereon, a lens 368, and a frame 367. As shown in FIG. 1, light emitted from the light source 320 is emitted by the lens 368 as illumination light 362 at a predetermined radiation angle, and illuminates an object 370.

[0023] <Power supply section> 1, power supply unit 380 is attached to wiring duct rail 395 installed on ceiling 390 by front attachment part 386 and rear attachment part 388, and is supplied with power (the inside of the wiring duct rail is normally not visible, but in this drawing the wiring duct rail is shown semi-transparent so that the attached state of power supply unit 380 can be seen). Attachment is performed by turning lever 385.

[0024] The power supply unit 380 has a slot for inserting a wireless module 382 , and the wireless module 382 transmits a wireless lighting control signal 352 sent from an external lighting control device 350 to the power supply unit 380 .

[0025] The power supply unit 380 has three channels of drive output for independently driving the three color LEDs. The wireless module 382 transmits a control signal to the power supply unit 380, thereby controlling the drive outputs of the three channels.

[0026] <Lighting control device> The lighting control device 350 is comprised of a tablet, smartphone, or PC, and runs lighting control software 351. The user uses the lighting control software 351 to adjust the light emission intensity of the three color LEDs. The conditions for the light emission intensity of the three color LEDs are transmitted as a wireless lighting control signal 352.

[0027] <Light source> A plan view of the light source 320 used in this embodiment is shown in FIG. 3. The light source 320 is formed by arranging three-color light-emitting elements in a light-emitting region 322 on a substrate 321 having a wiring pattern. As the light-emitting elements, 17 CSP (Chip Size Package) type LEDs 323-1 (E), 17 CSP type LEDs 323-2 (D), and 17 CSP type LEDs 323-3 (F) are arranged as shown in FIG. 3 and are connected in series by wiring inside the substrate. The light source 320 has a mounting hole 325, and is fastened to the heat sink 364 by passing a screw through the mounting hole 325. The light source 320 includes wiring terminals 326-1 (for CSP type LED 323-1), wiring terminals 326-2 (for CSP type LED 323-2), wiring terminals 326-3 (for CSP type LED 323-3), and a wiring terminal 326-0 (common terminal), and is connected to a power supply unit 380 having three outputs, and the light emission of each LED is controlled.

[0028] <Structure of LED> The CSP type LED 323-1, CSP type LED 323-2, and CSP type LED 323-3, which are the light-emitting elements used in the embodiment, include a blue LED chip made of InGaN or the like, and a phosphor-containing resin that covers the side surface and the upper surface of the blue LED chip, and has terminals for passing current through the bottom surface or the side surface of each LED. As the phosphor, one or several of a green phosphor that absorbs the light of the blue LED and emits green light, a yellow phosphor that emits yellow light, and a red phosphor that emits red light are used.

[0029] In each of the above LEDs, as the yellow phosphor, for example, (Y 1-x Gd x )3Al5O 12 :Ce 2+ (0≦x≦1) is used. As the green phosphor, for example, Lu3Al5O 12 :Ce 2+ is used. As the red phosphor, for example, Sr x Ca 1-x AlSiN3:Eu 3+ (0≦x≦1) phosphor, Sr[LiAl3N4]:Eu 2+ or K2SiF6:Mn 4+ phosphor can be preferably used. Quantum dots can also be preferably used.

[0030] <Chromaticity of LED> FIG. 4 is a chromaticity diagram (CIE1931 chromaticity coordinate diagram) for explaining the chromaticity of these LEDs, and a line connecting the chromaticities of the blackbody radiation locus is shown as BBL. Also shown are a line representing the chromaticity that appears to be closest to the color temperature TCT on BBL, and a line representing the color deviation Duv from BBL. CCT A line representing and a line representing the color deviation Duv from BBL are shown.

[0031] The chromaticities of the CSP type LEDs 323-1, 323-2, and 323-3, which are the light emitting elements used in this embodiment, are "E" (LED for meat), "D" (LED for bread), and "F" (LED for fresh fish) in FIG. 4, respectively. However, "for meat, for bread, for fresh fish" are merely examples, and "E" is also suitable for various objects such as red fruits, and "D" is suitable for fried foods.

[0032] The chromaticity coordinates of the CSP type LED 323-1 (D) are (0.458, 0.407).

[0033] The chromaticity coordinates of the CSP type LED 323-2 (E) are (0.412, 0.327).

[0034] The chromaticity coordinates of the CSP type LED 323-3 (F) are (0.358, 0.342).

[0035] The correlated color temperature T CCT (unit: K (kelvin)) is approximately 2700K for E and D, approximately 4500K for F, and the difference is approximately 1800K.

[0036] The color deviation Duv is approximately -1 for D, approximately -31 for E, and the difference is approximately 30.

[0037] Also, for all three of these LEDs, the color deviation Duv is on the negative side of the blackbody radiation locus (BBL = Black Body Locus).

[0038] The chromaticity of each LED can also be displayed using the chromaticity coordinates (u',v') of CIE1976 instead of the chromaticity coordinates (x,y) of CIE1931, and the two can be converted to each other using the conversion formula u'=4x / (-2x+12y+3), v'=9y / (-2x+12y+3).Display using other chromaticity coordinate systems is also possible.

[0039] In particular, the chromaticity of the CSP LED 323-2 is characterized by a color that is far from the blackbody radiation locus (BBL), with a color deviation Duv of -31, which is a large absolute value. By combining the CSP LED 323-2 with the CSP LED 323-1 and CSP LED 323-3, which are relatively close to the blackbody radiation locus, the color deviation can be adjusted appropriately.

[0040] By appropriately combining the light from the light-emitting elements CSP type LED 323-1(D), CSP type LED 323-2(E), and CSP type LED 323-3(F), it is possible to obtain light of the chromaticity of the triangle and the chromaticity inside it in Figure 4. For example, the colors of the points indicated as DE, EF, and EF in the figure can be suitably used to match the food ingredients.

[0041] Conventionally, color-adjustable lighting, which combines multiple colors, has been used to change color temperature. By changing the "color temperature" along the blackbody radiation, color-adjustable lighting can adjust between "cool, high color temperature, fluorescent light color" and "warm, low color temperature, incandescent light color," achieving lighting that feels natural to people. Unlike such "living space" lighting, this example uses lighting that changes the "color deviation" that feels strange to people, thereby creating lighting that brings out the color of the object.

[0042] The light-emitting elements CSP LED323-1(D), CSP LED323-2(E), and CSP LED323-3(F) also have distinctive spectra. Figure 5 shows the spectra of D and F, and Figure 6 shows the spectra of D and E after passing through an optical system such as lens 368. Each graph is normalized by the maximum value of G (green) in the wavelength range of 490 to 570 nm. Unlike the composite of RGB monochromatic light (described below), the spectrum of each light-emitting element contains spectral components across the entire wavelength range. However, the maximum value of R (red) in the wavelength range of 600 to 660 nm > the maximum value of G (green) in the wavelength range of 490 to 570 nm > the maximum value of Y (yellow) in the wavelength range of 570 to 600 nm. The Y spectrum is suppressed (the maximum value of Y is smaller than the maximum values ​​of R and G), emphasizing the red color. Therefore, the spectrum obtained by combining D, E, and F also has an R>G>Y relationship.

[0043] Figure 5, which compares the spectra of D and F by normalizing the light intensity by the maximum value of G, shows that F, which has a high color temperature, weakens the R component and strengthens the B component compared to D, which has a low color temperature.

[0044] Figure 6 shows a comparison of the spectra of D and E, normalizing the light intensity by the maximum value of G. It can be seen that E, which has a large absolute value on the negative side of Duv, strengthens the B and R components compared to D, which has a small absolute value of Duv.

[0045] It should be noted that the vertical axis in Figures 5 and 6 represents light intensity and does not take luminosity into account. The luminosity coefficients in the CIE 1931 relative luminosity curve are 0.06472 at a wavelength of 450 nm (B), 0.95447 at a wavelength of 540 nm (G), 0.89636 at a wavelength of 580 nm (Y), and 0.29803 at a wavelength of 630 nm (R). The coefficients for G and Y are close to 1, while the coefficients for B and R are small. Therefore, the G and Y components have a large impact on the overall appearance of color.

[0046] Taking this into consideration, in the spectrum of each color, the maximum value of Y (a value that does not take luminosity into account) should be 0.25 or more, and preferably 0.5 or more, with the maximum value of G being 1. On the other hand, it is desirable that the maximum value of Y is below the line connecting the maximum values ​​of G and R, so that the Y component is suppressed, and it is more desirable that the maximum value of Y is below the maximum value of G.

[0047] Figure 7 will be used to explain the difference between the method using light-emitting elements of the three colors D, E, and F, which have distinctive spectra, and the RGB (red, green, blue) method, which can theoretically produce all colors. In Figure 7, R is red, G is green, and B is blue. Since all colors can be obtained using RGB, one might wonder if using the three colors D, E, and F makes no difference to the RGB method. However, as Figure 7 shows, the area enclosed by the three colors D, E, and F is extremely small compared to the area enclosed by the three RGB colors.

[0048] FIG. 8 shows a schematic diagram illustrating color unevenness. Light source 320' consists of three color LEDs (E, F, and G) and illuminates white object 370' through lens 368'. Because the light from the three LEDs does not completely overlap, areas shown as D-rich, E-rich, and F-rich result. If an "RGB" primary color light source were used, these areas would be R-rich, G-rich, and B-rich. However, because R, G, and B are different primary colors, color unevenness would be noticeable. In the present invention, by using three color LEDs with a limited chromaticity range instead of a primary color light source, the chromaticity difference in areas where the light does not overlap sufficiently is small to begin with, thereby essentially reducing color unevenness.

[0049] By using D, E, and F lighting, which contain not only R, G, and B components but also a moderate Y component and have spectra that are naturally suited to target lighting, or by using lighting with a mixture of these colors, it is possible to achieve lighting that is suitable for a variety of foods, such as red and yellow fruits, green vegetables, red meat, sashimi, and salmon, blue-backed fish, and brown bread, baked goods, and fried foods. Although this lighting system was developed with food in mind, it has also been shown to produce beautiful results when used to illuminate a variety of objects, including clothing, car bodies, furniture, accessories, and flowers. However, in some cases, a color may look beautiful in the store but appear different at home, so it is preferable to adjust and add light such as E, which has a large absolute value of color deviation. This lighting system is advantageous because it allows for fine-tuning of the amount of color deviation, or in other words, how a color appears, through "color mixing."

[0050] Furthermore, in light source 320 shown in FIG. 3, the chromaticity difference between the three color LEDs arranged in light-emitting region 322 is small, which has the advantage that color unevenness when irradiated onto an object is small and almost unnoticeable.

[0051] The correlated color temperature T of each light-emitting element used in the present invention CCT The temperature is 2000K or higher, preferably 2500K or higher, and 6000K or lower, preferably 5000K or lower.

[0052] The color deviation Duv (1000 times the color deviation duv) of each light-emitting element used in the present invention should be -50 or more (absolute value 50 or less), preferably -40 or more (absolute value 40 or less), and +20 or less, preferably +10 or less. The difference in color deviation between two light-emitting elements with the largest difference in color deviation should be 50 or less, preferably 40 or less. By using light-emitting elements with such limited color deviation, color unevenness can be reduced. On the other hand, in order to accommodate objects of various colors, the color deviation between two light-emitting elements with the largest difference in color deviation should be 10 or more, preferably 20 or more, and more preferably 30 or more.

[0053] The correlated color temperature T CCTIn order to accommodate objects of various colors, the difference should be 400 K or more, preferably 800 K or more, and more preferably 1200 K or more. On the other hand, from the viewpoint of reducing color unevenness, the difference should be 3000 K or less, and preferably 2000 K or less.

[0054] <Embodiment 2> <Basic configuration> The second embodiment is an embodiment of a straight tube LED type lighting device.

[0055] <Refrigerated showcase> 9 is an explanatory diagram in which the front of a refrigerated showcase 410 is cut away to explain the straight tube LEDs used in the refrigerated showcase. The refrigerated showcase 410 has an opening 411, a top plate 414, shelves 415, and a bottom plate 416. Straight tube LEDs 460 are provided under the top plate 414 and shelves 415 to illuminate foodstuffs placed on the shelves 415 and bottom plate 416.

[0056] <Straight tube LED> The straight tube LED 460 is provided with a cylindrical or semi-cylindrical translucent cover member. Fig. 10 is a schematic plan view of a printed circuit board 421 installed inside the translucent cover member of the straight tube LED. Surface-mounted LEDs 423-1(D), 423-2(E), and 423-3(F) are mounted on the surface of the printed circuit board 421. Note that D, E, and F in parentheses indicate the chromaticity of each LED in Fig. 4.

[0057] The color of the 460 straight tube LEDs is controlled to emit light in a color that matches the food placed on the shelves. By installing control wiring inside the refrigerated showcase, the color can be changed by wired control rather than wireless control.

[0058] <Embodiment 3> <Basic configuration> Illumination device 500 according to this embodiment is shown in Fig. 11. Illumination device 500 is a spotlight, and comprises a lamp body 560, a power supply unit 580, and an arm 575 that connects lamp body 560 to power supply unit 580, and can be connected to a wiring duct rail. To wirelessly control the emitted color, power supply unit 580 is provided with wireless module 582, which is a detachable wireless transceiver, and illumination control device 350 is used to change the emitted color.

[0059] <Light body> 12 is an exploded perspective view of a lighting body 560. The lighting body 560 comprises a heat sink 564, a printed circuit board 521 placed on the heat sink 564, a multi-lens 566, and twelve lenses 568 integrally molded within the multi-lens. Twelve surface-mounted LEDs 523 are mounted on the printed circuit board 521, and each of the surface-mounted LEDs 523 corresponds to a lens 568.

[0060] <Light source> FIG. 13 is a chromaticity diagram for explaining the chromaticity of an LED. The surface-mounted LED 523 has B27 (2700K), A27 (T CCT =2700K, Duv=-10), B46(4600K), A46(T CCT The LEDs are each made up of three LEDs of four colors (T = 4600K, Duv = -10). CCT =3000K,Duv=-4), AW35(T CCT =3500K,Duv=-5),AW42(T CCT = 4200K, Duv = -5).

[0061] In Figure 13, an example of a spectrum obtained by combining each color is AW35, or T CCTFigure 14 shows the composite spectrum at 3500K. The blue component around 450 nm is represented by B, the green component around 550 nm by G, the yellow component around 590 nm by Y, and the red component around 630 nm by R. In the clothing industry, to ensure natural color appearance, it is preferable to have light across the entire spectral range and a color rendering index (Ra) of 90 or higher, with 93 or higher and even 95 or higher being preferable. Given the preference for whitish colors with less yellowing in the clothing industry, the Y component is slightly reduced and the R component is increased compared to the typical high-color-rendering LED shown by the dotted line in Figure 13. As a result, the color temperature does not change significantly, and the color deviation (Duv) is approximately -5. The half-width (FWHM) indicated by the dotted line is approximately 180 nm, but it is preferable that it be 150 nm or higher. In particular, when the R peak is taken as 100%, Y (590 nm) should be 50% or higher, preferably 60% or higher, and more preferably 70% or higher.

[0062] Here, the difference in color deviation Duv between the first light-emitting element, designated B, and the second light-emitting element, designated A, is preferably 5 or more, and more preferably 10 or more. On the other hand, for objects that are commonly seen under normal lighting, such as clothing, car bodies, furniture, small items, and flowers, the difference in Duv is preferably 15 or less, so that there is little sense of incongruity when illuminated with this lighting device compared to when illuminated with a normal lighting device. For food products, the difference in Duv should be 15 or more, with an emphasis on how colors appear in stores, making it preferable to make meat and red fruit look particularly attractive.

[0063] <Embodiment 4> <Basic configuration> For an explanation of a lighting system including lighting device 300A according to this embodiment, please refer to the configuration diagram shown in Fig. 1. Since this embodiment uses lighting device 300A and lighting control device 350A, 300 in Fig. 1 will be read as 300A and 350 as 350A. Lighting control software 351A (not shown) is installed in lighting control device 350A.

[0064] <Light source> The light source 320A used in the lighting device 300A is configured by arranging 24 each of CSP (Chip Size Package) type LEDs 323A-1 (R (red)), CSP type LEDs 323A-2 (GYw (green-yellowish white)), and CSP type LEDs 323A-3 (Wp (violetish white)) in the light-emitting region 322A on the substrate 321A having a wiring pattern, and connecting them in series with the wiring inside the substrate.

[0065] <Chromaticity of LED> FIG. 15 is a chromaticity diagram (CIE1931 chromaticity coordinate diagram) for explaining the chromaticity of the light-emitting elements used in the lighting device of the present embodiment, and the correlated color temperature T, which is the chromaticity that appears to be the color closest to the color temperature TCT on the blackbody radiation locus BBL. CCT The line representing T and the line representing the color deviation duv from the blackbody radiation locus BBL are shown (although it is denoted as duv in FIG. 15, it is described as Duv, which is 1000 times that, in the specification).

[0066] The chromaticities of the CSP type LEDs 323A-1, CSP type LEDs 323A-2, and CSP type LEDs 323A-3, which are the light-emitting elements used in the present embodiment, are "R", "GYw", and "Wp" in FIG. 15, respectively.

[0067] The chromaticity coordinates of the CSP type LED 323A-1 (R) are (0.58, 0.36), and its correlated color temperature T CCT is approximately 1300K, and Duv is approximately -10.

[0068] The chromaticity coordinates of the CSP type LED 323A-2 (GYw) are (0.34, 0.44), and its correlated color temperature T CCT is approximately 5100K, and Duv is approximately +40.

[0069] The chromaticity coordinates of the CSP type LED 323A-3 (Wp) are (0.29, 0.24), and its correlated color temperature T CCT is approximately 15000K, and Duv is approximately -37.

[0070] In the chromaticity range enclosed by R, GYw, and Wp of each light-emitting element in Figure 15, the area that overlaps with BBL (the line where duv = 0) is from about 3000K to about 6700K, which is within the range obtained by combining a general incandescent LED and a daylight LED. CCT At 5000K, Duv can be changed from -50 to +35. This is possible because the color is adjusted using three light-emitting elements, and the Duv of the chromaticity coordinates of Wp is set to about -37 on the negative side. CCT is 7000K or more and 50000K or less, Duv is -50 or more and -20 or less, preferably 10000K or more and 30000K or less, and Duv is -50 or more and -20 or less.

[0071] <Interface 0: Mode Selection> The applicant has proposed, for example, an interface for selecting "color temperature and color deviation" as shown in Figures 8 and 10 of JP 2021-190283 A, and a "color setting button" type interface as shown in Figure 5 of the same document. In addition to these, this embodiment uses lighting control software 351A that presents the option of "fresh mode." Alternatively, there may be no other options and the user may proceed directly to the "fresh mode" interface.

[0072] <Interface 1: Selection of ingredient group (target group)> 16 shows the interface 50. This is a screen for selecting an ingredient group. Note that the ingredient group is an example, and other object groups, such as a clothing group or furniture group, may also be displayed.

[0073] Ingredient group selection buttons 51 in Figure 16 are displayed as 51A "Meat," 51B "Fresh Fish," 51C "Vegetables," 51D "Prepared Meals," and 51E "Natural." When 51A "Meat" is pressed, the explanation for 51A "Meat" is displayed in explanation field 52: "Colors that bring out the natural color of red meat ingredients. Recommended: Meat, Sushi, Red Meat Fish." From this explanation, it can be seen that even in meat mode, red meat fish such as tuna sashimi and octopus are also supported (meaning fish and shellfish as ingredients, not living fish).

[0074] Pressing the decision button 53X selects the ingredient group "meat" and moves to a detailed color selection interface. Pressing the cancel button 53Y also allows the user to select a different ingredient group.

[0075] <Interface 2: Color selection> When the ingredient group "meat" is selected, a specific color can be selected within the chromaticity region indicated as MT in the chromaticity diagram of FIG. 17. Here, selectable chromaticity points are indicated within the chromaticity region MT by interface 65. Note that if a second interface capable of continuously changing chromaticity is used, the selectable chromaticities are not limited to these points. Rather than selecting a chromaticity from the entire region bounded by the chromaticities of the three light-emitting elements R-GYw-Wp, the chromaticity region is first limited to the ingredient, and the user can then select from within that region, allowing the user to quickly set an appropriate chromaticity.

[0076] FIG. 18(a) shows an interface 60. This displays multiple color selection buttons 61 (for example, seven) for selecting a color from the ingredient group "meat." The color of each color selection button 61 mimics the corresponding luminous color. Furthermore, a description of the appropriate ingredient, such as "chicken," "pork," "beef," or "XX," may be displayed in a description field 62 corresponding to each chromaticity selection button. A dimming rate is also determined for each color selection button 61. The description field 62 may include an explanation of the dimming rate, such as a dimming rate of 100%, but the dimming rate may also be set separately from the color selection buttons 61.

[0077] The user selects one of the color selection buttons 61 and presses the confirm button 63X to confirm the chromaticity. Pressing the cancel button 63Y returns the user to the ingredient group selection screen shown in FIG.

[0078] Since the interface 60 limits the number of color selection buttons 61 to make it easier for the user to select, there may be cases where the appropriate color is not displayed. In such cases, the user can press the details button 64 to move to the interface 65 shown in Figure 18(b), which allows for detailed color selection.

[0079] The interface 65 has 40 color selection buttons 66 arranged vertically and horizontally. An explanation box 67 indicating that the color selection buttons are suitable for "chicken" or "pork" is superimposed on the color selection buttons as appropriate. The user selects a color selection button 66, sets a brightness control 69 to an appropriate value, and presses the confirm button 68X, and the color and brightness selected by the user are set.

[0080] When multiple color selection buttons 61 and 66 are used, the selectable chromaticities are discrete, but the chromaticity area MT is an area that surrounds the selectable chromaticities.

[0081] As mentioned above, the chromaticity range corresponding to each food group is limited to a portion of the chromaticity range that can be achieved by the light-emitting elements of the lighting device, and chromaticity options that are not suitable for use with that food group are pre-selected, making it easier for the user to select an appropriate color.

[0082] Interfaces 1 and 2 may be displayed on separate screens as described above, or both may be displayed on a single display screen. An example of interface 150 displaying interfaces 1 and 2 on a single display screen is shown in FIG. 19.

[0083] First, select 151B "Fresh fish" from among the ingredient group selection buttons 151A, 151B, 151C, 151D, and 151E. Then, color selection button 161BS corresponding to ingredient group 151B "Fresh fish" is highlighted among the multiple color selection buttons 161. Here, the button is displayed with a thick border.

[0084] When the user selects one of the buttons 161BS, that section is further highlighted, in this case with diagonal stripes.

[0085] When the user sets the slide-type brightness control volume 171, which changes the brightness, to an appropriate value and presses the enter button 163X, the color and brightness selected by the user are set.

[0086] When the ingredient group "fresh fish" is selected, a color can be selected from within the chromaticity region indicated as FS in the chromaticity diagram of FIG. 20. The chromaticity region FS and the chromaticity region MT overlap. In this case, too, the chromaticity can be determined using an interface similar to the chromaticity button interface 65 in FIG. 18. FIG. 20 also shows the chromaticity points that can be selected in this case.

[0087] If the ingredient group "fruit and vegetables" is selected, colors can be selected within the chromaticity region indicated as VG on the chromaticity diagram of Figure 21. Figure 21 also shows chromaticity points that can be selected using a chromaticity selection interface similar to interface 65.

[0088] When the ingredient group "prepared dishes" is selected, colors within the chromaticity ranges indicated as DT1 and DT2 in the chromaticity diagram of Figure 22 can be selected. Thus, multiple chromaticity ranges may correspond to an ingredient group. Figure 22 also shows chromaticity points that can be selected when using a chromaticity selection interface similar to interface 65.

[0089] If the ingredient group "Natural" is selected, colors can be selected within the chromaticity region indicated as NR on the chromaticity diagram of Figure 23. Figure 23 also shows chromaticity points that can be selected using a chromaticity selection interface similar to interface 65.

[0090] <Relationship between the chromaticity range of each food group and the overall chromaticity range> Figure 24 is a chromaticity diagram in which the chromaticity regions MT, FS, VG, DT1, DT2, and NR corresponding to the above-mentioned ingredient groups are displayed overlapping each other. The entire chromaticity region consisting of the chromaticity regions MT, FS, VG, DT1, DT2, and NR is considered to be the selectable chromaticity region. It can be seen that there are overlapping portions of the chromaticity regions corresponding to the ingredient groups.

[0091] In this embodiment, the chromaticity of the three light-emitting elements used for color synthesis is set close to the selectable chromaticity range. Specifically, Wp, which falls within the chromaticity range described below, is used instead of the primary color blue, and GYw, which falls within the chromaticity range described below, is used instead of the primary color green. However, R, which falls within the chromaticity range that is approximately equivalent to the primary color red, is used as red.

[0092] 24, if the length of the line connecting the chromaticity of light-emitting element Wp and the chromaticity of light-emitting element R is 100%, and a point on that line that is 50% from the chromaticity of light-emitting element Wp and a line connecting the chromaticity of light-emitting element Wp and the chromaticity of light-emitting element GYw are 100% long, a line connecting the point on that line that is 50% from the chromaticity of light-emitting element Wp intersects with the selectable chromaticity area. Also, if the length of the line connecting the chromaticity of light-emitting element GYw and the chromaticity of light-emitting element R is 100%, and a line connecting the point on that line that is 50% from the chromaticity of light-emitting element GYw and the chromaticity of light-emitting element Wp are 100% long, a line connecting the point on that line that is 50% from the chromaticity of light-emitting element GYw intersects with the selectable chromaticity area.

[0093] On the other hand, the vicinity of the color emitted by only one type of light-emitting element, i.e., the vicinity of the chromaticity point of light-emitting element GYw, the vicinity of the chromaticity point of light-emitting element Wp, and the vicinity of the chromaticity point of light-emitting element R, are not included in the selectable chromaticity range. The reason for this is that when all three types of light-emitting elements are used, the total luminous flux is high, but when only one type of light-emitting element is used, the total luminous flux is low. Also, since the luminous efficiency of LEDs decreases in the high current range, when all three types of light-emitting elements are used, the current value of each is small and the luminous efficiency is high, but when only one type of light-emitting element is used, the luminous efficiency is low. Furthermore, as will be described later, by combining the spectra of each light-emitting element, a spectrum suitable for each food group is obtained.

[0094] Specifically, with respect to the chromaticity coordinates of the light-emitting elements R, GYw, and Wp used in this embodiment shown in Figure 24, the length of the line connecting the chromaticity of light-emitting element R and the chromaticity of light-emitting element Wp is set to 100%, and the length of the line connecting the chromaticity of light-emitting element R and the chromaticity of light-emitting element GYw is set to 100%, and the chromaticity on the light-emitting element R side of the line connecting the point 45% from light-emitting element R on that line is not used as a selectable chromaticity area.

[0095] Furthermore, if the length of the line connecting the chromaticity of light-emitting element Wp and the chromaticity of light-emitting element R is taken as 100%, and a point on that line that is 30% from light-emitting element Wp is taken as 100%, and if the length of the line connecting the chromaticity of light-emitting element Wp and the chromaticity of light-emitting element GYw is taken as 100%, the chromaticity on the light-emitting element Wp side of the line connecting the point on that line that is 30% from light-emitting element R is not used as a selectable chromaticity area.

[0096] Furthermore, if the length of the line connecting the chromaticity of the light-emitting element GYw and the chromaticity of the light-emitting element R is taken as 100%, and the point on that line that is 30% from the light-emitting element GYw is taken as 100%, and the length of the line connecting the chromaticity of the light-emitting element GYw and the chromaticity of the light-emitting element Wp is taken as 100%, the chromaticity on the light-emitting element GYw side of the line connecting the point on that line that is 30% from the light-emitting element GYw is not used as a selectable chromaticity area.

[0097] These are merely examples, and it is preferable that the chromaticity of the light-emitting element is not included in the chromaticity range of the object group. It is also preferable that the chromaticity of the light-emitting element's neighbors is not included in the chromaticity range of the object group. As a specific example of neighboring chromaticities, if the length of a line connecting the chromaticity of a certain light-emitting element (light-emitting element 0) and the chromaticity of another light-emitting element (light-emitting element 1) is taken as 100%, and a point on the line that is at least 20% from light-emitting element 0 is taken as 100%, and if the length of a line connecting the chromaticity of light-emitting element 0 and the chromaticity of another light-emitting element (light-emitting element 2) different from the above is taken as 100%, it is preferable that the chromaticity on the light-emitting element 0 side of the line connecting the point on the line that is at least 20% from light-emitting element 0 is not used as the chromaticity range of the object group.

[0098] The inventors created and examined Wp, GYw, and R, which have slightly different chromaticities. When determining the selectable chromaticity range and setting the condition that the chromaticity range near the light-emitting element is not used as described above, the preferred chromaticity of the light-emitting element was found to be in the following range.

[0099] Figure 25 shows a chromaticity diagram illustrating the preferred chromaticity ranges for light-emitting elements. The region bounded by the chromaticities of the three light-emitting elements covers the selectable chromaticity range consisting of the chromaticity ranges MT, FS, VG, DT1, DT2, and NR of the food ingredient group, as described above, and is preferably a chromaticity that does not deviate too far from this range. Specifically, the preferred region Wp(1) for the chromaticity of Wp is the range bounded by the chromaticity coordinates (0.288, 0.213), (0.327, 0.255), (0.312, 0.285), and (0.264, 0.232), and the more preferred region Wp(2) is the range bounded by the chromaticity coordinates (0.286, 0.219), (0.305, 0.24), (0.295, 0.26), and (0.271, 0.233).

[0100] The region GYw(1) suitable for the chromaticity of GYw is the range surrounded by the chromaticity coordinates of (0.374, 0.418), (0.368, 0.494), (0.321, 0.449), and (0.324, 0.377), and the more preferable region GYw(2) is the range surrounded by the chromaticity coordinates of (0.36, 0.433), (0.36, 0.473), (0.328, 0.443), and (0.329, 0.405).

[0101] The region R(1) suitable for the chromaticity of R is the range surrounded by the chromaticity coordinates of (0.575, 0.424), (0.517, 0.348), (0.685, 0.239), and (0.736, 0.264).

[0102] <Spectrum of light-emitting element> FIG. 26 shows the light emitting elements LED323A-1, LED323A-2, and LED323A-3 used in this embodiment, and the spectrum obtained by combining the light emitted from these three elements by one-third (shown as 1, 2, 3, and composite, respectively).

[0103] The LED 323A-1 has a strong peak in the R (red) region, near a wavelength of 640 nm.

[0104] The spectrum of LED323A-3 (labeled as 3) is shown in Figure 27. It shows that there are peaks not only in the B (blue) region, around a wavelength of 450 nm, but also in the G (green) region, around a wavelength of 525 nm, and in the R (red) region, around 630 nm. There is also a dip in the Y (yellow) region, around a wavelength of 570 nm, but this is greater than 50% (60-80%) of the G peak.

[0105] The spectrum of LED323A-2, shown as 2, is shown in Figure 28. The color appears to be white with a yellow-green tinge overall, but there is a peak in the G (green) region, near a wavelength of 525 nm, and a dip in the Y (yellow) region, near a wavelength of 580 nm (greater than 50% (50-70%) of the G peak). There are also peaks in the B (blue) region, near a wavelength of 460 nm, and in the R (red) region, near 625 nm.

[0106] In this way, by combining light from light source "1" with a peak in the red wavelength region, light source "2" with a peak in the green wavelength region and sub-peaks in the red and blue wavelength regions, and light source "3" with a peak in the blue wavelength region and sub-peaks in the red and green wavelength regions, it is possible to obtain light with peaks in the red, green, and blue wavelength regions, with a spectrum that smoothly transitions between them except for blue-green (near 480 nm), as shown in "Combined" in Figure 26. This type of light emphasizes the red, green, and blue wavelength regions of ingredients while slightly suppressing the yellow wavelength region (near 570 nm), which in many ingredients reduces the vividness of blue and red, making the ingredients look more appealing.

[0107] <Notes and variations> (1) The light-emitting element is not limited to an LED, but may be any light-emitting element, such as an organic EL (organic LED), an element in which the phosphor and excitation light source are separated, an element that uses discharge, or an element that is excited by an electron beam.

[0108] (2) As for the LEDs of each color, in the first embodiment, CSP type LEDs are mounted on a single substrate, and in the second and third embodiments, SMD (Surface Mount Device) type LEDs are mounted on a printed circuit board, but the light source of the chromaticity and spectrum of the third embodiment may be a CSP, and the light source of the chromaticity and spectrum of the first embodiment may be an SMD. COB type LEDs may also be used, in which blue LED chips are arranged on a substrate and multiple blue LED chips are covered with a resin containing phosphor.

[0109] (3) Although examples of three-color and four-color LEDs have been given as light sources using LEDs of multiple light colors, it is also possible to use only two-color LEDs with different color deviations (for example, D and E, F and E, A46 and B27).

[0110] (4) The chromaticity of each LED in the embodiment is an example, and other chromaticities may be used.

[0111] (5) Although examples of spotlights and straight tube LEDs have been shown as lighting devices, they may also be downlights, universal (variable direction) downlights, or surface or linear light sources called base lights.

[0112] (6) Although the example of wireless control has been given as a method for controlling the light color of the lighting device, wired control may also be used.

[0113] (7) In this application, the term "object" is used to include not only "merchandise" but also "non-saleable items" such as art objects and antiques in a museum, and children's paintings in an exhibition.

[0114] (8) The chromaticity coordinates may vary within the range of chromaticity that is discernible to humans. The "MacAdam color discrimination ellipse (MacAdam ellipse)" has been proposed as the range of chromaticity that is discernible to humans. Because the chromaticity coordinates have a spread similar to that of a MacAdam ellipse, the color deviation and correlated color temperature ranges also allow for a difference of three steps of the MacAdam ellipse, and the specifications of commercially available LEDs indicate that there is a similar degree of color variation.

[0115] (9) In this application, the "chromaticity of the light-emitting element" and "color temperature of the light-emitting element" refer to the chromaticity and color temperature that can be observed from the outside. When the light from the light-emitting element passes through an optical system such as a lens and is emitted to the outside, the chromaticity and color temperature include the influence of the spectral change caused by passing through the lens, etc.

[0116] (10) The multiple color selection buttons 161 in Figure 19 may be provided so that a color can be selected from the entire range of chromaticity that can be achieved by the light-emitting element used, or may be provided so that a color can be selected from within a predetermined narrowed chromaticity range.

[0117] (11) The chromaticity selection interface may include an input box for searching for the name of an object, such as the name of an ingredient, and may allow the user to select one or more recommended chromaticities corresponding to the searched ingredient. In this case, the same recommended chromaticity may be displayed even if the words "chicken," "chicken meat," or "poultry meat" are used in different ways.

[0118] (12) The chromaticity selection interface may display a list of object names, such as food ingredients, and allow the user to select one or more recommended chromaticities for the selected ingredient. In this case, the same recommended chromaticity may be displayed even if the ingredient name is different, such as "chicken," "chicken meat," or "poultry."

[0119] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-described embodiments, but should be defined by the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0120] 50, 60, 65, 150 interface 51, 151 Ingredient group selection button 52, 62, 67 Description 53X, 63X, 68X, 163X Confirm button 53Y, 63Y, 68Y, 163Y Cancel button 61, 66, 161, 161B, 161BS color selection buttons 64 Details button 69, 171 Dimming volume 300, 300A, 500 lighting equipment 320, 320A light source 321, 321A board 322, 322A Light-emitting area 323, 323A CSP type LED 325 mounting holes 326 Wiring terminal 350, 350A Lighting Control Device 351, 351A Lighting Control Software 352 Lighting Control Signal 360 light body 362 Illumination 364 Heatsink 367 slots 368, 368' lens 370 Objects 375 Arm 380 Power supply section 382 Wireless Module 385 Lever 386 Front mounting part 388 Rear mounting part 390 Ceiling 395 Wiring Duct Rail 410 Refrigerated Showcase 411 Aperture 414 Top plate 415 Shelf 416 Bottom plate 421 Printed Circuit Board 423 Surface Mount LED 460 straight tube LED 521 Printed Circuit Board 523 Surface Mount LED 560 light body 564 Heatsink 566 Multi-Lens 568 Lens 575 Arm 580 Power supply section 582 Wireless Module

Claims

1. The light emitting device includes at least a first light emitting element, a second light emitting element, and a third light emitting element, each of which emits light with different chromaticities; A lighting device comprising an interface that controls the light intensity ratio of the light emitted by each of the light-emitting elements to select an emission color of a specific chromaticity within a selectable chromaticity region that is a part of an overall region surrounded by the chromaticity of the first light-emitting element, the chromaticity of the second light-emitting element, and the chromaticity of the third light-emitting element, and that does not include the chromaticity of each of the light-emitting elements.

2. the selectable chromaticity region is made up of a plurality of object group corresponding chromaticity regions; A user can use the interface to select one of the object group corresponding chromaticity regions and then select the emission color of the specific chromaticity from the object group corresponding chromaticity region.

10. The lighting device according to claim 1.

3. The selectable chromaticity area is: a point on a line connecting the chromaticity of the first light-emitting element and the chromaticity of the second light-emitting element that is 20% away from the first light-emitting element, the length of the line being 100%; the length of a line connecting the chromaticity of the first light-emitting element and the chromaticity of the third light-emitting element is taken as 100%, and the line connecting a point 20% from the first light-emitting element on the line does not include a side closer to the first light-emitting element than the line connecting the point 3. The lighting device according to claim 1 or 2.

4. The selectable chromaticity area is: a point on a line connecting the chromaticity of the first light-emitting element and the chromaticity of the second light-emitting element, the length of which is 100%, that is 50% from the first light-emitting element; a line connecting the chromaticity of the first light-emitting element and the chromaticity of the third light-emitting element intersects with the line connecting the chromaticity of the first light-emitting element and the point that is 50% of the chromaticity of the third light-emitting element, where the length of the line is 100%; 3. The lighting device according to claim 1 or 2.

5. The chromaticity of the third light-emitting element is within a range surrounded by chromaticity coordinates of (0.288, 0.213), (0.327, 0.255), (0.312, 0.285), and (0.264, 0.232).

3. The lighting device according to claim 1 or 2.

6. The chromaticity of the second light-emitting element is within a range surrounded by chromaticity coordinates of (0.374, 0.418), (0.368, 0.494), (0.321, 0.449), and (0.324, 0.377).

3. The lighting device according to claim 1 or 2.

7. The chromaticity of the first light-emitting element is within a range surrounded by chromaticity coordinates of (0.575, 0.424), (0.517, 0.348), (0.685, 0.239), and (0.736, 0.264).

3. The lighting device according to claim 1 or 2.

8. A lighting device including a first light-emitting element, a second light-emitting element, and a third light-emitting element each emitting a different light color, and capable of controlling the light intensity ratio thereof, the first light-emitting element, the second light-emitting element, and the third light-emitting element all have a correlated color temperature of 2000 K or more and 6000 K or less; A lighting device, wherein the difference in color deviation Duv between the first light-emitting element, the second light-emitting element, and the third light-emitting element with the largest color deviation Duv and the one with the smallest color deviation Duv is 10 or more and 50 or less.

9. 9. The lighting device according to claim 8, wherein the first light-emitting element, the second light-emitting element, and the third light-emitting element have a color deviation Duv of not less than −50 and not more than +20.

10. 10. The lighting device according to claim 8, wherein a maximum value in a wavelength region of 570 nm or more and 600 nm or less is 0.25 or more with respect to a maximum value in a wavelength region of 490 nm or more and 570 nm or less in the spectra of each of the first light-emitting element, the second light-emitting element, and the third light-emitting element is 0.25 or more.

11. Further, a fourth light-emitting element having a correlated color temperature of 2000 K or more and 6000 K or less and a color deviation Duv of −50 or more and +20 or less is provided, a light intensity ratio between the first light-emitting element, the second light-emitting element, the third light-emitting element, and the fourth light-emitting element is controllable; 10. The lighting device according to claim 8 or 9.

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