Light source module and lighting fixture

Abstract

To provide a light source module capable of emitting light that contains a purple component and is suitable for use in lighting, and a piece of lighting equipment.SOLUTION: The light source module emits output light. The light source module includes multiple light-emitting parts. The multiple light-emitting parts include multiple light-emitting parts each emitting light of different colors. The output light includes the light emitted by each of the multiple light-emitting parts. In the output light of the light source module, the ratio of the radiant flux in the wavelength range from 360 nm to 400 nm to the total radiant flux in the visible light region is the same as sunlight with the same correlated color temperature as the output light of the light source module.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a light source module and a lighting fixture. [Background technology]

[0002] Patent Document 1 discloses a light source module including a blue-violet LED (Light Emitting Diode) and a white LED. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-525413 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, it has been reported that purple light is effective in suppressing myopia in humans. However, the prior art has not disclosed a configuration of a light source module that is suitable for using light containing a purple component as illumination for humans.

[0005] An object of the present invention is to provide a light source module and a lighting fixture that can emit output light that contains a violet component and is suitable for use in lighting. [Means for solving the problem]

[0006] A light source module according to one aspect of the present invention is a light source module that emits output light and includes a plurality of light-emitting elements, the plurality of light-emitting elements including light-emitting elements that emit light of different light colors from one another, the output light including light emitted by each of the plurality of light-emitting elements, and in the output light, the ratio of radiant flux in a wavelength range of 360 nm or more and 400 nm or less to total radiant flux in the visible light region is the same as that of sunlight having the same correlated color temperature as the output light.

[0007] A light source module according to one aspect of the present invention is a light source module that emits output light, and includes a plurality of light-emitting elements, the plurality of light-emitting elements including light-emitting elements that emit light of different light colors from one another, the output light including light emitted by each of the plurality of light-emitting elements, and the radiant flux of the output light in a wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region is the same as that of sunlight having the same correlated color temperature as the output light.

[0008] A lighting fixture according to one aspect of the present invention includes the above-described light source module and a lighting circuit that supplies power to the light source module for lighting the light source module. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a light source module and a lighting fixture that can emit output light that contains a violet component and is suitable for use in lighting. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing an example of the appearance of a lighting fixture including a light source module according to a first embodiment. [Figure 2] FIG. 2 is a block diagram showing the configuration of the lighting fixture according to the first embodiment. [Figure 3] FIG. 3 is a plan view showing the light source module according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a part of the light source module according to the first embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of the spectrum of the first light emitted by the first light-emitting unit according to the first embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the spectrum of the second light emitted by the second light-emitting unit according to the first embodiment. [Figure 7] FIG. 7 is a diagram showing an example of an excitation spectrum of a phosphor included in the second light-emitting section according to the first embodiment. [Figure 8]FIG. 8 is a diagram illustrating an example of the spectrum of the output light emitted by the light source module according to the first embodiment. [Figure 9] FIG. 9 is a plan view showing a light source module according to a modification of the first embodiment. [Figure 10] FIG. 10 is a block diagram showing the configuration of a lighting fixture according to the second embodiment. [Figure 11] FIG. 11 is a diagram showing an example of the spectrum of output light emitted by the light source module according to the second embodiment and the spectrum of sunlight having the same correlated color temperature as the output light. [Figure 12] FIG. 12 is a block diagram showing a configuration of a lighting fixture according to a modification of the second embodiment. [Figure 13] FIG. 13 is an xy chromaticity diagram in the CIE1931 color space illustrating an example of changes in the correlated color temperature of output light from a lighting fixture according to a modification of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Below, a light source module and a lighting fixture according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements and connection forms, steps, and step sequences shown in the following embodiments are merely examples and are not intended to limit the present invention. Among the components in the following embodiments, components not recited in the independent claims will be described as optional components.

[0012] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0013] Furthermore, in this specification, terms indicating the relationship between elements, terms indicating the shape of elements, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0014] Furthermore, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components unless otherwise specified, but are used for the purpose of avoiding confusion and distinguishing between components of the same type.

[0015] Furthermore, in this specification, the numerical value of color deviation Duv is the numerical value of Duv, which is an expression of color deviation from the blackbody radiation locus defined by JIS Z8725, i.e., 1000 times the numerical value of duv. In other words, in this specification, the numerical value of color deviation Duv is 1000 times the numerical value of duv, in accordance with JIS Z8725, unless otherwise specified.

[0016] (Embodiment 1) [composition] First, the configurations of the light source module and the lighting fixture according to the first embodiment will be described with reference to FIGS.

[0017] FIG. 1 is a perspective view showing an example of the appearance of a lighting fixture 100 including a light source module 50 according to the present embodiment. FIG. 2 is a block diagram showing the configuration of the lighting fixture 100 according to the present embodiment. FIG. 3 is a plan view showing the light source module 50 according to the present embodiment. FIG. 4 is a cross-sectional view showing a part of the light source module 50 according to the present embodiment. FIG. 4 shows a cross-section taken along line IV-IV in FIG. 3.

[0018] The lighting fixture 100 shown in FIG. 1 is, for example, a stand lamp. As shown in FIG. 2, the lighting fixture 100 includes a light source module 50 and a lighting circuit 70. The lighting fixture 100 also includes, for example, a head housing that houses the light source module 50, an arm that supports the head, and a main body to which the arm is attached. The lighting fixture 100 receives power supplied from a power supply such as a commercial power source, and irradiates the light emitted by the light source module 50 using the power as illumination light. Note that the lighting fixture 100 is not particularly limited as long as it is a lighting fixture used for illumination, and may be a ceiling light, base light, spotlight, downlight, pendant light, wall light, floor light, or the like. The lighting fixture 100 is a residential lighting fixture installed in, for example, a child's room, bedroom, living room, or study, but may also be a lighting fixture used in offices, stores, commercial facilities, factories, etc.

[0019] The light source module 50 emits output light used for illumination. The light color of the output light is, for example, white. As shown in FIG. 3, the light source module 50 includes a substrate 1, a first light-emitting unit 10, and a second light-emitting unit 20. In this embodiment, the light source module 50 includes a plurality of first light-emitting units 10 and a plurality of second light-emitting units 20. The first light-emitting unit 10 is an example of a purple light-emitting unit, and the second light-emitting unit 20 is an example of a white light-emitting unit. Note that in FIG. 3, the first light-emitting unit 10 is given a dotted pattern, but this is intended to distinguish the first light-emitting unit 10 from the second light-emitting unit 20 and does not mean that the first light-emitting unit 10 has a dotted pattern.

[0020] The first light-emitting unit 10 and the second light-emitting unit 20 are each a surface mount device (SMD) light-emitting module.

[0021] The first light-emitting unit 10 emits a first light. The second light-emitting unit 20 emits a second light. The output light emitted by the light source module 50 includes the first light emitted by all of the first light-emitting units 10 included in the light source module 50 and the second light emitted by all of the second light-emitting units 20 included in the light source module 50. In other words, the output light of the light source module 50 is a mixture of the first light and the second light. In the output light, the total radiant energy of the second light emitted by all of the second light-emitting units 20 is greater than, for example, the total radiant energy of the first light emitted by all of the first light-emitting units 10.

[0022] The plurality of first light-emitting units 10 and the plurality of second light-emitting units 20 are, for example, arranged spaced apart from one another on the substrate 1. In the example shown in FIG. 3 , the plurality of first light-emitting units 10 and the plurality of second light-emitting units 20 are regularly arranged in a line at equal intervals. The number of second light-emitting units 20 is, for example, greater than the number of first light-emitting units 10. Note that the number and arrangement of the first light-emitting units 10 and the second light-emitting units 20 are not particularly limited. The first light-emitting units 10 and the second light-emitting units 20 may be arranged, for example, in two or more rows, in a ring shape, or at lattice points of a predetermined lattice shape. Furthermore, the number of at least one of the first light-emitting units 10 and the second light-emitting units 20 may be one. The arrangement of the first light-emitting units 10 and the second light-emitting units 20 is determined, for example, by creating several arrangement patterns and evaluating the light radiation characteristics, etc. of each arrangement pattern to select the best arrangement pattern.

[0023] The plurality of first light-emitting units 10 and the plurality of second light-emitting units 20 are mounted on the substrate 1, for example, so that the same amount of current flows through them. Note that the plurality of first light-emitting units 10 and the plurality of second light-emitting units 20 may also be mounted on the substrate 1 so that individual currents can flow independently.

[0024] The substrate 1 is a mounting substrate for mounting the first light-emitting unit 10 and the second light-emitting unit 20. The substrate 1 is provided with metal wiring (not shown) for supplying power to the first light-emitting unit 10 and the second light-emitting unit 20. The substrate 1 is, for example, a ceramic substrate made of ceramic, a resin substrate made of resin, or an insulating substrate such as a glass substrate. Alternatively, the substrate 1 may be a metal-based substrate (metal substrate) in which a metal plate is coated with an insulating film.

[0025] As shown in FIG. 4, the first light-emitting unit 10 includes a first light-emitting element 11, a sealing member 15, and a package 17. The first light-emitting unit 10 does not include, for example, a phosphor, and emits light emitted by the first light-emitting element 11 as is as the first light. The first light is light containing a violet component having an intensity in the wavelength range of the violet component, such as violet light. When the first light is light containing a violet component, for example, the output light can be used for illumination to achieve the effect of suppressing myopia in humans. In this specification, the wavelength range of the violet component can be considered to be, for example, a wavelength range of 350 nm to 410 nm.

[0026] The first light-emitting element 11 is, for example, an LED chip, and is disposed in a recess of the package 17. The emission peak wavelength of the first light-emitting element 11 is, for example, 350 nm or more and 410 nm or less, and may be 360 ​​nm or more and 400 nm or less. In addition, the emission peak wavelength of the first light-emitting element 11 is shorter than the emission peak wavelength of the second light-emitting element 21.

[0027] The sealing member 15 is a light-transmitting resin material that seals the first light-emitting element 11. The light-transmitting resin material is not particularly limited as long as it is a material that transmits light emitted by the first light-emitting element 11. Examples of the light-transmitting resin material that can be used include silicone resin, epoxy resin, and urea resin.

[0028] The package 17 is, for example, a container made of a resin material and molded into a predetermined shape.

[0029] As shown in FIG. 4 , the second light-emitting unit 20 includes a second light-emitting element 21, a phosphor 22, a sealing member 25, and a package 27. The second light-emitting unit 20 emits a white second light, which is a mixture of light emitted by the second light-emitting element 21 (specifically, light not absorbed by the phosphor 22) and light emitted by the phosphor 22. In this specification, white light refers to a light color for illumination that falls within the range of daylight (D), neutral white (N), white (W), warm white (WW), and incandescent white (L), or that follows a blackbody locus or synthetic daylight locus with a correlated color temperature higher or lower than the blackbody locus or synthetic daylight locus. This does not refer to the narrow range of white (W) in the chromaticity classification of light colors. The color deviation Duv of the second light and the output light is, for example, between -10 and +10.

[0030] The second light-emitting element 21 is, for example, an LED chip, and is disposed in a recess in the package 27. The emission peak wavelength of the second light-emitting element 21 is, for example, 410 nm or more and 500 nm or less, and may be 420 nm or more and 470 nm or less. The second light-emitting element 21 emits, for example, blue light.

[0031] The phosphor 22 is excited by a portion of the light emitted by the second light-emitting element 21 and emits light with a longer wavelength than the light emitted by the second light-emitting element 21. The phosphor 22 emits, for example, green light with an emission peak wavelength of 500 nm or more and 570 nm or less. The phosphor 22 is dispersed in the sealing member 25. The phosphor 22 is, for example, an yttrium aluminum garnet (YAG) phosphor or a lutetium aluminum garnet (LuAG) phosphor. By using these phosphors, it is possible to easily adjust the wavelength showing a minimum value in the excitation spectrum of the phosphor 22, which will be described later. For example, adjusting the composition elements of the phosphor 22 changes the band gap of the phosphor 22, thereby making it possible to adjust the excitation spectrum of the phosphor 22. Note that the color of the light emitted by the phosphor 22 is not limited to green and may be a color other than green, such as yellow or red. The second light-emitting unit 20 may further include another phosphor having an emission peak wavelength different from that of the phosphor 22 to adjust the light color of the second light.

[0032] The sealing member 25 is a light-transmitting resin material that seals the second light-emitting element 21. The light-transmitting resin material is not particularly limited as long as it transmits light emitted by the second light-emitting element 21 and the phosphor 22. Examples of the light-transmitting resin material that can be used include silicone resin, epoxy resin, and urea resin.

[0033] The package 27 is, for example, a container made of a resin material and molded into a predetermined shape.

[0034] The second light emitted by the second light-emitting unit 20 is adjusted to a desired light color by adjusting at least one of the output characteristics of the second light-emitting element 21 and the type and amount of the phosphor 22.

[0035] The first light-emitting unit 10 and the second light-emitting unit 20 may not include the package 17 and the package 27, respectively, and the first light-emitting element 11 and the second light-emitting element 21 may be directly mounted on the substrate 1. In other words, the light source module 50 may be a COB (Chip On Board) type module in which the first light-emitting element 11 and the second light-emitting element 21 are directly mounted on the substrate 1.

[0036] The lighting circuit 70 is a circuit that lights up the light source module 50 by supplying power to the light source module 50. The lighting circuit 70, for example, supplies a predetermined power (direct current) to each of the first light-emitting unit 10 and the second light-emitting unit 20. The lighting circuit 70 includes, for example, a circuit that converts alternating current supplied from a commercial power source into direct current.

[0037] The lighting device 100 may further include a control unit (control circuit) that adjusts the brightness and color of the light output from the light source module 50. The control unit, for example, controls the power supplied to the light source module 50 by the lighting circuit 70. The lighting device 100 may further include an operation reception unit, such as a switch or input panel, that receives operations on the lighting device 100, and a communication module for remote operation.

[0038] [Spectra of the first light, the second light, and the output light, and the excitation spectrum of the phosphor] Next, the spectra of the first light, the second light, and the output light, as well as the excitation spectrum of the phosphor 22, will be described with reference to FIGS.

[0039] FIG. 5 is a diagram showing an example of the spectrum of the first light emitted by the first light emitter 10 according to the present embodiment. FIG. 6 is a diagram showing an example of the spectrum of the second light emitted by the second light emitter 20 according to the present embodiment. FIG. 7 is a diagram showing an example of the excitation spectrum of the phosphor 22 included in the second light emitter 20 according to the present embodiment. FIG. 8 is a diagram showing an example of the spectrum of the output light emitted by the light source module 50 according to the present embodiment. In FIGS. 5 to 8, the horizontal axis represents wavelength (unit: nm). In FIGS. 5, 6, and 8, the vertical axis represents emission intensity normalized with the maximum value set to 1. That is, in FIGS. 5, 6, and 8, spectra normalized by radiant flux (unit: W / nm) for each wavelength are shown. In addition, in FIG. 7, the vertical axis represents excitation intensity normalized with the maximum value set to 1. In general, the excitation spectrum of a phosphor is almost the same as its absorption spectrum.

[0040] As shown in Fig. 5, the spectrum of the first light includes an emission peak of the light emitted by first light-emitting element 11. In the present embodiment, the spectrum of the first light is, for example, the same as the spectrum of the light emitted by first light-emitting element 11, and the spectrum shown in Fig. 5 can also be said to be the spectrum of the light emitted by first light-emitting element 11. In the example shown in Fig. 5, the wavelength of the emission peak of first light-emitting element 11 is approximately 380 nm, and the half-value width of the emission peak is approximately 10 nm. For example, the entire emission intensity of the light emitted by first light-emitting element 11, i.e., the first light, is included in the wavelength range of the violet component.

[0041] The first light may have an emission intensity or an emission peak outside the wavelength range of the violet component (for example, on the longer wavelength side than the violet component) by, for example, including a phosphor in first light-emitting unit 10. When the first light has an emission intensity or an emission peak outside the wavelength range of the violet component, the maximum value of the emission intensity or the emission intensity at the emission peak is, for example, half or less of the emission intensity of the emission peak of the light emitted by first light-emitting element 11. When the first light has an emission intensity or an emission peak outside the wavelength range of the violet component, for example, the radiant flux of the first light in the wavelength range of the violet component may be one or more times, or two or more times, the radiant flux of the first light outside the wavelength range of the violet component.

[0042] As shown in Fig. 6, the spectrum of the second light includes an emission peak of the light emitted by the second light-emitting element 21 and a broad emission peak of the light emitted by the phosphor 22. Fig. 6 shows the spectrum of the second light when the correlated color temperature is 5000 K. In the example shown in Fig. 6, the wavelength of the emission peak of the second light-emitting element 21 is approximately 450 nm, and the half-value width of the emission peak is approximately 20 nm. In addition, the wavelength of the emission peak of the light emitted by the phosphor 22 is approximately 580 nm.

[0043] 7, the excitation spectrum of phosphor 22 has a minimum value in the wavelength range of 350 nm to 410 nm in which first light-emitting element 11 has an emission intensity. For example, when phosphor 22 that emits green light is used, the excitation intensity of phosphor 22 tends to be small in the wavelength range of 350 nm to 410 nm in which first light-emitting element 11 has an emission intensity. Furthermore, the excitation spectrum of phosphor 22 may have a minimum value in the wavelength range of 360 nm to 400 nm in which first light-emitting element 11 has an emission intensity.

[0044] Furthermore, the excitation spectrum of phosphor 22 has a minimum value, for example, within the range of the half width of the emission peak of first light-emitting element 11. In the example shown in Fig. 7, the excitation spectrum of phosphor 22 has a minimum value of excitation intensity at approximately 380 nm. Therefore, in the examples shown in Figs. 5 and 7, the wavelength of the emission peak of first light-emitting element 11 and the wavelength at which the excitation spectrum of phosphor 22 shows a minimum value match. Note that when second light-emitting section 20 includes another phosphor other than phosphor 22, the excitation spectrum of the other phosphor may also have a minimum value in the wavelength range in which first light-emitting element 11 has an emission intensity.

[0045] 7, the excitation spectrum of phosphor 22 has a maximum excitation intensity peak at a wavelength of approximately 430 nm. In the excitation spectrum of phosphor 22, the excitation intensity at the emission peak wavelength of first light-emitting element 11 (approximately 380 nm in this example) is, for example, less than half, and may be less than one-third, of the excitation intensity at the emission peak wavelength of second light-emitting element 21 (approximately 450 nm in this example). This makes it possible to increase the luminous efficiency of second light-emitting unit 20 while suppressing excitation of phosphor 22 by the first light.

[0046] Thus, in the light source module 50, the excitation spectrum of the phosphor 22 has a minimum value in the wavelength range in which the first light-emitting element 11 has an emission intensity. Therefore, even if a portion of the first light emitted from the first light-emitting unit 10 is incident on the second light-emitting unit 20 due to diffusion or the like, the phosphor 22 is unlikely to be excited by the incident first light. This prevents the phosphor 22 from emitting light of an unintended wavelength due to the first light. Even when the light source module 50 includes the first light-emitting unit 10, changes in the color of the white second light emitted by the second light-emitting unit 20 are suppressed. In particular, since the light emitted by the phosphor 22 has a longer wavelength than the excitation light, the light emitted by the phosphor 22 excited by the first light has a wavelength longer than the wavelength of the first light, which increases human luminosity, and therefore has a significant impact on the light color perceived by humans. For example, the human luminosity at 400 nm is 10 times that at 380 nm. Therefore, in the second light-emitting unit 20, excitation of the phosphor 22 by the first light is suppressed, thereby suppressing a change in light color from white, which is appropriate for illumination. Furthermore, since the first light is less likely to be absorbed by the phosphor 22, a decrease in the amount of the first light containing a violet component in the output light can be suppressed. Therefore, the light source module 50 can effectively emit output light containing a violet component and used for illumination. Therefore, the output light of the light source module 50 can be used, for example, for illumination having a myopia suppressing effect.

[0047] 8, the spectrum of the output light is a spectrum obtained by adding the spectrum of the first light and the spectrum of the second light at a predetermined ratio. The predetermined ratio is adjusted, for example, by the number of first light-emitting units 10 and second light-emitting units 20 included in the light source module 50 and the output power of each of the first light-emitting units 10 and second light-emitting units 20. The spectrum shown in FIG. 8 is the spectrum of the output light when the same current is applied to the first light-emitting units 10 and second light-emitting units 20 included in the light source module 50. The output light has the highest emission intensity, for example, at the emission peak wavelength of the first light-emitting element 11 (approximately 380 nm in this example). Because light of a purple wavelength has low luminosity, even if the emission intensity of the emission peak wavelength of the first light-emitting element 11 is high, the effect on the light color perceived by humans is small. Therefore, by increasing the purple component in the output light, the myopia suppression effect can be improved.

[0048] [Effects, etc.] As described above, the light source module 50 according to the present embodiment is a light source module 50 that emits output light and includes a first light-emitting unit 10 that emits a first light and a second light-emitting unit 20 that emits a white second light. The first light-emitting unit 10 includes a first light-emitting element 11. The second light-emitting unit 20 includes a second light-emitting element 21 and a phosphor 22 that emits light when excited by light from the second light-emitting element 21. The output light includes the first light and the second light. The emission peak wavelength of the first light-emitting element 11 is shorter than the emission peak wavelength of the second light-emitting element 21 and is not less than 350 nm and not more than 410 nm. The excitation spectrum of the phosphor 22 has a minimum value in the wavelength range of not less than 350 nm and not more than 410 nm, in which the first light-emitting element 11 has an emission intensity.

[0049] As a result, even if a portion of the first light containing a violet component emitted from the first light-emitting unit 10 is incident on the second light-emitting unit 20 due to diffusion or the like, the incident first light is unlikely to excite the phosphor 22. Therefore, the first light is unlikely to cause the phosphor 22 to emit light of an unintended wavelength, and even when the light source module 50 includes the first light-emitting unit 10, a change in the color of the white second light emitted by the second light-emitting unit 20 is suppressed. In other words, by suppressing excitation of the phosphor 22 by the first light in the second light-emitting unit 20, a change in the color of the light from white, which is appropriate for illumination, can be suppressed. Furthermore, because the first light is unlikely to be absorbed by the phosphor 22, a decrease in the amount of the first light containing a violet component in the output light can be suppressed. Therefore, the light source module 50 can effectively emit output light containing a violet component.

[0050] Furthermore, for example, the excitation spectrum of the phosphor 22 has a minimum value within the range of the half width of the emission peak of the first light emitting element 11.

[0051] This makes it possible to further suppress the excitation of the phosphor 22 in the second light-emitting section 20 by the first light.

[0052] Furthermore, for example, in the excitation spectrum of the phosphor 22, the intensity at the wavelength of the emission peak of the first light emitting element 11 is half or less of the intensity at the wavelength of the emission peak of the second light emitting element 21.

[0053] This makes it possible to increase the luminous efficiency of the second light-emitting section 20 while suppressing the excitation of the phosphor 22 by the first light.

[0054] Furthermore, for example, the output light of the light source module 50 has the highest emission intensity at the wavelength of the emission peak of the first light emitting element 11.

[0055] This increases the violet component in the output light, which in turn increases the myopia suppression effect of the output light on people, for example.

[0056] Furthermore, lighting fixture 100 according to this embodiment includes light source module 50 and lighting circuit 70 that supplies light source module 50 with power for lighting light source module 50.

[0057] This makes it possible to realize lighting device 100 that can effectively emit output light containing a violet component.

[0058] [Variations] Next, a description will be given of a modification of embodiment 1. In the following description, differences from embodiment 1 will be mainly described, and explanation of commonalities will be omitted or simplified.

[0059] Fig. 9 is a plan view showing a light source module 50a according to this modification. As shown in Fig. 9, light source module 50a differs from light source module 50 according to embodiment 1 in that the first light-emitting units 10 and the second light-emitting units 20 are not arranged at equal intervals. Light source module 50a can be used in lighting fixture 100, for example, in place of light source module 50.

[0060] The multiple first light-emitting units 10 include a first light-emitting unit 10a that is one of the multiple first light-emitting units 10. The multiple second light-emitting units 20 include a second light-emitting unit 20a that is closest to the first light-emitting unit 10a among the multiple second light-emitting units 20, and a second light-emitting unit 20b that is closest to the second light-emitting unit 20a among the multiple second light-emitting units 20. The first light-emitting unit 10a is an example of a first purple light-emitting unit. The second light-emitting unit 20a is an example of a first white light-emitting unit. The second light-emitting unit 20b is an example of a second white light-emitting unit. The first light-emitting unit 10a, the second light-emitting unit 20a, and the second light-emitting unit 20b are, for example, arranged in a line in this order.

[0061] The distance W1 between the first light-emitting section 10a and the second light-emitting section 20a is longer than the distance W2 between the second light-emitting section 20a and the second light-emitting section 20b. This increases the distance W1 between the second light-emitting section 20a and the first light-emitting section 10a that is closest to the second light-emitting section 20a, making it more difficult for the first light emitted by the first light-emitting section 10a to enter the second light-emitting section 20a. As a result, excitation of the phosphor 22 by the first light is further suppressed. This further suppresses changes in the color of the second light and decreases in the amount of the first light in the output light.

[0062] In the light source module 50a, the distance to the first light-emitting unit 10 closest to each of the second light-emitting units 20 is longer than the distance to the second light-emitting unit 20 other than itself that is closest to itself.

[0063] As described above, in the light source module 50a according to this modification, at least one first light-emitting section 10 includes the first light-emitting section 10a, and at least one second light-emitting section 20 includes the second light-emitting section 20a that is closest to the first light-emitting section 10a and the second light-emitting section 20b that is closest to the second light-emitting section 20a, among the second light-emitting sections 20. The distance W1 between the first light-emitting section 10a and the second light-emitting section 20a is longer than the distance W2 between the second light-emitting section 20a and the second light-emitting section 20b.

[0064] This makes it difficult for the first light emitted from the first light-emitting section 10a to be incident on the second light-emitting section 20a, and excitation of the phosphor 22 by the first light is further suppressed.

[0065] (Embodiment 2) Next, a description will be given of embodiment 2. The following description will focus on the differences from embodiment 1 and the modified version of embodiment 1, and the description of commonalities will be omitted or simplified.

[0066] Fig. 10 is a block diagram showing the configuration of lighting fixture 200 according to the present embodiment. As shown in Fig. 10, lighting fixture 200 differs from lighting fixture 100 according to embodiment 1 in that lighting fixture 200 includes light source module 250 instead of light source module 50.

[0067] Like the light source module 50, the light source module 250 has a plurality of light-emitting units including at least one first light-emitting unit 10 and at least one second light-emitting unit 20, but has a different spectrum of output light from the light source module 50. The configuration of the light source module 250 is the same as that of the light source module 50, except that, for example, the light source module 250 has a plurality of light-emitting units configured to emit output light with a spectrum different from that of the light source module 50. The output light emitted by the light source module 250 includes first light emitted by all of the first light-emitting units 10 included in the light source module 250 and second light emitted by all of the second light-emitting units 20 included in the light source module 250.

[0068] The light source module 250 has a different spectrum of output light from the light source module 50, for example, because the number of first light-emitting units 10 and second light-emitting units 20 included therein is different from that of the light source module 50. Note that the light source module 250 may have a different spectrum of output light from the light source module 50 because the light-emitting characteristics of at least one of the first light-emitting element 11, the second light-emitting element 21, and the phosphor 22 are different from those of the light source module 50.

[0069] Fig. 11 is a diagram showing an example of the spectrum of output light emitted by light source module 250 according to the present embodiment and the spectrum of sunlight having the same correlated color temperature as the output light. In Fig. 11, the horizontal axis represents wavelength (unit: nm). In Fig. 11, the vertical axis represents luminous intensity normalized with the maximum value being 1. The spectra of the first light and the second light and the excitation spectrum of phosphor 22 are, for example, the spectra shown in Figs. 5 to 7, respectively.

[0070] The spectrum of output light shown in Fig. 11 is the spectrum when the correlated color temperature of the output light is 5000 K. The spectrum of sunlight shown in Fig. 11 is the spectrum of light from a D-series standard light source defined by the International Commission on Illumination (CIE) with a correlated color temperature of 5000 K (so-called CIE standard illuminant D50). In this specification, the spectrum of sunlight can be considered to be the spectrum of light from a standard light source with each correlated color temperature defined by the International Commission on Illumination. In other words, in this specification, sunlight can be considered to be light from a standard light source with each correlated color temperature defined by the International Commission on Illumination.

[0071] 11, the spectrum of the output light is a spectrum obtained by adding the spectrum of the first light shown in FIG. 5 and the spectrum of the second light shown in FIG. 6 at a predetermined ratio. The predetermined ratio is adjusted, for example, by the number of first light-emitting units 10 and second light-emitting units 20 included in the light source module 250 and the outputs of the first light-emitting units 10 and second light-emitting units 20. The spectrum of the output light shown in FIG. 11 is, for example, the spectrum of the output light when the same current is passed through the first light-emitting units 10 and second light-emitting units 20 included in the light source module 250.

[0072] In light source module 250, the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm (the range enclosed by the dashed dotted lines in FIG. 11 ) to the total radiant flux in the visible light range of output light is the same as the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light range of sunlight with the same correlated color temperature as the output light. Furthermore, in light source module 250, the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light range of output light (in other words, the ratio of the radiant flux to the total luminous flux) is the same as the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light range of sunlight with the same correlated color temperature as the output light. This allows the output light to contain violet light at the same ratio as sunlight, thereby reducing the burden on people even when using lighting that contains a violet component. Therefore, light source module 250 can emit output light that contains a violet component and is suitable for use in lighting. Therefore, the light source module 250 can be used for, for example, lighting that has a myopia suppressing effect. In addition, since the light source module 250 emits output light that includes a violet component that is missing from light sources used for general lighting, it is possible to provide lighting that is more desirable for humans.

[0073] In this specification, the visible light region can be considered to be, for example, a wavelength range of 360 nm or more and 780 nm or less.

[0074] The radiant flux of the output light and sunlight corresponds to the area of ​​the spectrum shown in Figure 11. Therefore, if the wavelength is λ and the spectrum of the output light is P L (λ), the spectrum of sunlight is P S (λ), the total radiant flux of the output light in the visible light region is Φ Lall and radiant flux Φ in the wavelength range of 360 nm to 400 nm Lv , and the total radiant flux Φ in the visible light region of sunlight Sall and radiant flux Φ in the wavelength range of 360 nm to 400 nm Sv is calculated using the following formula: P L (λ) and P S (λ) is a function of wavelength (unit: nm).

[0075]

number

[0076]

number

[0077]

number

[0078]

number

[0079] In addition, if the human visual sensitivity is K(λ), the total luminous flux of the output light in the visible light range Φ VLall and the total luminous flux Φ in the visible light region of sunlight VSall is calculated by the following formula: K(λ) is a function of wavelength (unit: nm).

[0080]

number

[0081]

number

[0082] Therefore, in the light source module 250, the ratio of the radiant flux to the total radiant flux is expressed as P L (λ) and P of the same correlated color temperature as the output light S When calculated using the above formula using (λ), the radiant flux Φ Lv / total radiant flux Φ Lall is the radiant flux Φ Sv / total radiant flux Φ Sall In the light source module 250, the radiant flux per unit total luminous flux is expressed as P L (λ) and P of the same correlated color temperature as the output lightS When calculated using the above formula using (λ), the radiant flux Φ Lv / total luminous fluxΦ VLall is the radiant flux Φ Sv / total luminous fluxΦ VSall In this specification, "same" means "substantially the same." Here, "substantially the same" means, for example, a difference of ±30% or less. "Substantially the same" may also mean a difference of ±20% or less, or a difference of ±10% or less.

[0083] 11, the output light has the highest emission intensity at, for example, the wavelength of the emission peak of the second light-emitting element 21 (approximately 450 nm in this example). In addition, the number of peaks (maxima) in the spectrum of the output light is three in the example shown in FIG. 11. The number of peaks in the spectrum of the output light is not limited to three, and may be, for example, seven or less, or five or less. This allows the light source module 250 to be realized with a simple configuration. In addition, the number of peaks in the spectrum of the output light is, for example, three or more.

[0084] Note that the light source module 250 is configured such that the spectral characteristics of the output light and the spectral characteristics of sunlight satisfy the above relationship, and the plurality of light-emitting units included in the light source module 250 are not limited to the above example. For example, the light source module 250 may be configured to include, instead of the second light-emitting unit 20, a plurality of light-emitting units each having a plurality of LED chips that emit light of different colors.

[0085] [Effects, etc.] As described above, light source module 250 according to the present embodiment is a light source module 250 that emits output light and includes a plurality of light-emitting units. The plurality of light-emitting units include a plurality of light-emitting units that emit light of different light colors. The output light includes light emitted by each of the plurality of light-emitting units. In the output light of light source module 250, the ratio of radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light region is the same as that of sunlight with the same correlated color temperature as the output light of light source module 250.

[0086] As a result, the output light contains the same proportion of violet components as sunlight, so even illumination using output light containing violet components can reduce the burden on people. Therefore, the light source module 250 can emit output light that contains violet components and is suitable for use in illumination. Furthermore, because the above proportion can be calculated using radiant flux, a value directly related to the energy radiated to people can be used.

[0087] Furthermore, light source module 250 according to the present embodiment is a light source module 250 that emits output light and includes a plurality of light-emitting units. The plurality of light-emitting units include a plurality of light-emitting units that emit light of different light colors. The output light includes light emitted by each of the plurality of light-emitting units. In the output light of light source module 250, the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light region is the same as that of sunlight having the same correlated color temperature as the output light of light source module 250.

[0088] As a result, the output light contains the same proportion of violet components as sunlight, so even illumination using output light containing violet components can reduce the burden on people. Therefore, the light source module 250 can emit output light that contains a violet component and is suitable for use in illumination. Furthermore, since the radiant flux per unit total luminous flux is used, it is easy to apply to lighting design.

[0089] Furthermore, for example, the plurality of light-emitting sections include a first light-emitting section 10 that emits a first light and a second light-emitting section 20 that emits a second white light. The first light-emitting section 10 has a first light-emitting element 11. The second light-emitting section 20 has a second light-emitting element 21 and a phosphor 22 that emits light when excited by light from the second light-emitting element 21. The output light includes the first light and the second light. The emission peak wavelength of the first light-emitting element 11 is shorter than the emission peak wavelength of the second light-emitting element 21 and is not less than 360 nm and not more than 400 nm. The excitation spectrum of the phosphor 22 has a minimum value in the wavelength range of not less than 360 nm and not more than 400 nm, in which the first light-emitting element 11 has an emission intensity.

[0090] As a result, even if a portion of the first light containing a violet component emitted from the first light-emitting unit 10 is incident on the second light-emitting unit 20 due to diffusion or the like, the incident first light is unlikely to excite the phosphor 22. This prevents the phosphor 22 from emitting light of an unintended wavelength due to the first light, and suppresses a change in the light color of the white second light emitted by the second light-emitting unit 20 even when the light source module 250 includes the first light-emitting unit 10. Furthermore, because the first light is unlikely to be absorbed by the phosphor 22, a decrease in the amount of the first light containing a violet component in the output light can be suppressed.

[0091] Furthermore, for example, the excitation spectrum of the phosphor 22 has a minimum value within the range of the half width of the emission peak of the first light emitting element 11.

[0092] This makes it possible to further suppress the excitation of the phosphor 22 in the second light-emitting section 20 by the first light.

[0093] Furthermore, lighting fixture 200 according to this embodiment includes light source module 250 and lighting circuit 70 that supplies light source module 250 with power for lighting light source module 250.

[0094] This makes it possible to realize lighting device 200 that can emit output light that contains a violet component and is suitable for use in lighting.

[0095] [Variations] Next, a description will be given of a variation of embodiment 2. In the following description, differences from embodiment 1, the variation of embodiment 1, and embodiment 2 will be mainly described, and explanation of commonalities will be omitted or simplified.

[0096] Fig. 12 is a block diagram showing the configuration of lighting device 200a according to this modification. As shown in Fig. 12, lighting device 200a differs from lighting device 200 according to embodiment 2 in that lighting device 200a includes light source module 250 instead of light source module 250 and in that lighting device 200a additionally includes control unit 90.

[0097] The light source module 250a includes a first light-emitting unit 10, a second light-emitting unit 20, and a third light-emitting unit 30. That is, the light source module 250a includes the third light-emitting unit 30 in addition to the configuration of the light source module 250.

[0098] The third light-emitting unit 30 emits a white third light. The output light emitted by the light source module 250a includes the first light emitted by all of the first light-emitting units 10 included in the light source module 250a, the second light emitted by all of the second light-emitting units 20 included in the light source module 250a, and the third light emitted by all of the third light-emitting units 30 included in the light source module 250a. Note that, under the control of the control unit 90, one of the second light-emitting units 20 and the third light-emitting unit 30 may not emit light, and the output light may not include one of the second light and the third light.

[0099] The third light-emitting unit 30 has the same configuration as the second light-emitting unit 20, except for the correlated color temperature of the light it emits. The third light-emitting unit 30 includes, for example, a light-emitting element, a phosphor, a sealing member, and a package, similar to the second light-emitting unit 20 shown in FIG. 4 . The light-emitting element, phosphor, sealing member, and package of the third light-emitting unit 30 may have the same configuration as the second light-emitting element 21, phosphor 22, sealing member 25, and package 27 of the second light-emitting unit 20. For example, the excitation spectrum of the phosphor of the third light-emitting unit 30 may have a minimum value in the wavelength range of 360 nm to 400 nm in which the first light-emitting element 11 has an emission intensity. The third light-emitting unit 30 differs from the second light-emitting unit 20 in the configuration of the corresponding second light-emitting element in at least one of the output characteristics of the light-emitting element and the type and amount of the phosphor, resulting in the correlated color temperature of the light it emits being different from that of the second light-emitting unit 20.

[0100] In the light source module 250a, lighting is controlled independently for the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30. In the light source module 250a, for example, the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 are mounted on a board so that power can be supplied independently to them.

[0101] The control unit 90 controls the light emission of the light source module 250a. The control unit 90 adjusts the output of each of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30, for example. The control unit 90 independently supplies power to the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 using the lighting circuit 70, for example, and adjusts the light intensity of each of the first light, the second light, and the third light by individually changing the amount of current. In this way, the control unit 90 changes the correlated color temperature of the output light. Note that when the control unit 90 supplies power using the lighting circuit 70, some light-emitting units may not be supplied with power depending on the correlated color temperature of the target output light. Furthermore, the control unit 90 may control the output of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30 using PMW (Pulse Width Modulation) control.

[0102] The control unit 90 is realized, for example, by an LSI (Large Scale Integration), which is an integrated circuit (IC). The integrated circuit is not limited to an LSI, and may be a dedicated circuit or a general-purpose processor. For example, the control unit 90 may be a microcontroller. The microcontroller includes, for example, a non-volatile memory in which a program is stored, a volatile memory which is a temporary storage area for executing the program, input / output ports, and a processor which executes the program. The control unit 90 may also be a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which the connections and settings of circuit cells in the LSI can be reconfigured. The functions executed by the control unit 90 may be realized by software or by hardware.

[0103] 13 is an xy chromaticity diagram in the CIE 1931 color space illustrating an example of changes in the correlated color temperature of the output light from lighting device 200a according to this modification. In FIG. 13, the second light-emitting unit 20 emits second light having chromaticity coordinate L2, and the third light-emitting unit 30 emits third light having chromaticity coordinate L3.

[0104] In the example shown in FIG. 13, the correlated color temperature of the second light is 6500 K, and the correlated color temperature of the third light is 3000 K. The correlated color temperatures of the second light and the third light are not particularly limited and are set according to the range in which the correlated color temperature of the output light is to be adjusted. In the example shown in FIG. 13, the chromaticity coordinate L2 of the second light and the chromaticity coordinate L3 of the third light are chromaticity coordinates on the blackbody radiation locus, but they may be deviated from the blackbody radiation locus. At least one of the chromaticity coordinate L2 of the second light and the chromaticity coordinate L3 of the third light may be a chromaticity coordinate outside the specified range of correlated color temperatures.

[0105] Although the output light includes the first light in addition to the second and third lights, the first light has little effect on the correlated color temperature of the output light. Therefore, the correlated color temperature of the output light is roughly determined by the ratio of the amount of the second light to the amount of the third light. For simplicity's sake, the following description will be given assuming that the correlated color temperature of the output light is determined by the ratio of the amount of the second light to the amount of the third light.

[0106] The control unit 90 changes the chromaticity coordinate of the mixed light of the second light and the third light between chromaticity coordinate L2 and chromaticity coordinate L3 by controlling the ratio between the output of the second light-emitting unit 20 and the output of the third light-emitting unit 30. This change also changes the correlated color temperature of the output light between the correlated color temperature of the second light and the correlated color temperature of the third light.

[0107] The control unit 90 also changes the correlated color temperature of the output light so that the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light range of the output light is the same as the ratio of the radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light range of sunlight with the same correlated color temperature as the output light. The control unit 90 also changes the correlated color temperature of the output light so that the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light range of the output light is the same as the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light range of sunlight with the same correlated color temperature as the output light. For example, the control unit 90 controls the output of the first light-emitting unit 10 to increase the correlated color temperature of the output light, and controls the output of the first light-emitting unit 10 to decrease the correlated color temperature of the output light. The control unit 90 holds, for example, a data table that associates the correlated color temperature of the output light with the amount of power (amount of current) supplied to each of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30, and controls the power supplied from the lighting circuit 70 to the light source module 250a based on the data table so that the output light has a desired correlated color temperature. The data table can be designed from the output characteristics of the first light-emitting unit 10, the second light-emitting unit 20, and the third light-emitting unit 30, and the spectra of the first light, the second light, and the third light.

[0108] As described above, lighting fixture 200a according to this modification includes control unit 90 that adjusts the output power of each of light-emitting elements in light source module 250a to change the correlated color temperature of the output light. For example, control unit 90 adjusts the correlated color temperature of the output light of light source module 250a so that the ratio of radiant flux in the wavelength range of 360 nm to 400 nm to the total radiant flux in the visible light range is the same as that of sunlight with the same correlated color temperature as the output light of light source module 250a. Furthermore, for example, control unit 90 adjusts the correlated color temperature of the output light of light source module 250a so that the radiant flux in the wavelength range of 360 nm to 400 nm per unit total luminous flux in the visible light range is the same as that of sunlight with the same correlated color temperature as the output light of light source module 250a.

[0109] As a result, even when the correlated color temperature of the output light is changed, the proportion of the purple component in the output light is adjusted to match that of sunlight at each correlated color temperature, thereby reducing the burden on people.

[0110] (others) The light source module and lighting fixture according to the present invention have been described above based on the above-mentioned embodiment and modifications, but the present invention is not limited to the above-mentioned embodiment and modifications.

[0111] For example, at least one of the first light-emitting element 11 and the second light-emitting element 21 does not have to be an LED chip. For example, at least one of the first light-emitting element 11 and the second light-emitting element 21 may be an element other than an LED chip, such as a laser element or an organic EL (Electroluminescence) element.

[0112] Furthermore, for example, the second light-emitting unit 20 may include a sintered body of the phosphor 22 instead of the sealing member 25 in which the phosphor 22 is dispersed. Furthermore, the second light-emitting unit 20 may be a remote phosphor type light-emitting module.

[0113] In addition, the present invention also includes forms obtained by applying various modifications that a person skilled in the art would conceive of to each embodiment and each modified example, and forms realized by arbitrarily combining the components and functions of each embodiment and each modified example within the scope that does not deviate from the spirit of the present invention. [Explanation of symbols]

[0114] 10, 10a First light-emitting part 11 First light-emitting element 20, 20a, 20b Second light-emitting unit 21 Second light-emitting element 22 Phosphor 50, 50a, 250, 250a light source module 70 Lighting circuit 90 Control Unit 100, 200, 200a lighting fixtures

Claims

1. A light source module that emits output light, A plurality of light-emitting units are provided, the plurality of light-emitting units include light-emitting units that emit light of different colors, the output light includes light emitted from each of the plurality of light-emitting units, In the output light, a ratio of a radiant flux in a wavelength range of 360 nm or more and 400 nm or less to a total radiant flux in a visible light region is the same as that of sunlight having the same correlated color temperature as the output light, the plurality of light-emitting units include a first light-emitting unit that emits first light having an emission peak wavelength of 360 nm or more and 400 nm or less, the first light being included in the output light; Light source module.

2. The plurality of light-emitting units include: a second light-emitting unit that includes a second light-emitting element and a phosphor that is excited by light from the second light-emitting element and emits light, and that emits white second light; the first light-emitting unit has a first light-emitting element, an emission peak wavelength of the first light-emitting element is shorter than a second emission peak wavelength of the second light-emitting element and is 360 nm or more and 400 nm or less; The excitation spectrum of the phosphor has a minimum value in a wavelength range of 360 nm to 400 nm in which the first light-emitting element has an emission intensity. The light source module according to claim 1 .

3. the excitation spectrum has a minimum value within a half width range of an emission peak of the first light-emitting element; The light source module according to claim 2 .

4. The light source module according to any one of claims 1 to 3; a lighting circuit that supplies power to the light source module for lighting the light source module, Lighting fixtures.

5. a control unit that adjusts the output of each of the plurality of light-emitting units to change the correlated color temperature of the output light, the control unit changes the correlated color temperature of the output light so that a ratio of radiant flux in a wavelength range of 360 nm or more and 400 nm or less to a total radiant flux in a visible light region in the output light is the same as that of sunlight having the same correlated color temperature as the output light.

5. A lighting fixture according to claim 4.

6. A light source module that emits output light, A plurality of light-emitting units are provided, the plurality of light-emitting units include light-emitting units that emit light of different colors, the output light includes light emitted from each of the plurality of light-emitting units, In the output light, a radiant flux in a wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region is the same as that of sunlight having the same correlated color temperature as that of the output light, the plurality of light-emitting units include a first light-emitting unit that emits first light having an emission peak wavelength of 360 nm or more and 400 nm or less, the first light being included in the output light; Light source module.

7. The plurality of light-emitting units include: a second light-emitting unit that includes a second light-emitting element and a phosphor that is excited by light from the second light-emitting element and emits light, and that emits white second light; the first light-emitting unit has a first light-emitting element, an emission peak wavelength of the first light-emitting element is shorter than a second emission peak wavelength of the second light-emitting element and is 360 nm or more and 400 nm or less; The excitation spectrum of the phosphor has a minimum value in a wavelength range of 360 nm to 400 nm in which the first light-emitting element has an emission intensity. The light source module according to claim 6 .

8. the wavelength at which the excitation spectrum exhibits the minimum value is within a range of a half width of an emission peak of the first light-emitting element; The light source module according to claim 7 .

9. The light source module according to any one of claims 6 to 8; a lighting circuit that supplies power to the light source module for lighting the light source module, Lighting fixtures.

10. the lighting device further includes a control unit that changes the correlated color temperature of the output light by adjusting the output power of each of the plurality of light-emitting units; the control unit changes the correlated color temperature of the output light so that a radiant flux in a wavelength range of 360 nm or more and 400 nm or less per unit total luminous flux in the visible light region of the output light is the same as that of sunlight having the same correlated color temperature as the output light.

10. A lighting fixture according to claim 9.

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