Lighting equipment

Abstract

A lighting device comprises: a first light-emitting unit, comprising a first light-emitting diode and a first wavelength converter; a second light-emitting unit, comprising a first second light-emitting diode and a second wavelength converter; a third light-emitting unit, comprising a first third light-emitting diode and a third wavelength converter; and at least one second light-emitting diode, wherein the first wavelength converter, the second wavelength converter and the third wavelength converter respectively contain a cyan wavelength conversion substance that converts light emitted from the light-emitting diode into cyan light, and in the irradiance spectrum of light emitted to the outside, the irradiance of the central wavelength of light generated by each light-emitting diode in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit and emitted to the outside without wavelength conversion is smaller than the irradiance of the peak wavelength of the cyan light emitted from each corresponding wavelength converter in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

Description

[0001] This application is a divisional application with an application date of November 28, 2019, application number 201980003097.2, and invention name “LED lighting device with sterilization function”. Technical Field

[0002] The present disclosure relates to a lighting device having a sterilization function using LEDs. Background Art

[0003] Light-emitting diodes are used as inorganic light sources in various fields such as display devices, car lights, and general lighting. In particular, light-emitting diodes have a long life and low power consumption, and are rapidly replacing existing lighting sources.

[0004] On the other hand, sunlight has a wide wavelength spectrum across ultraviolet, visible, and infrared regions, and it is well known that ultraviolet light has a sterilizing effect. Therefore, various light sources with sterilizing functions are being developed using ultraviolet LEDs.

[0005] However, ultraviolet rays with sterilization function are usually harmful to human body, especially eyes or skin. Therefore, the light source using ultraviolet LED needs to be used in unmanned space. That is, ultraviolet LED with sterilization function has the disadvantage of not being suitable for use in lighting devices in human activity space. Summary of the invention

[0006] The problem to be solved by the present disclosure is to provide a lighting device which is harmless to human body and has a sterilization function, and a lighting system having the same.

[0007] Another problem to be solved by the present disclosure is to provide a lighting device which does not induce eye diseases or skin diseases and has a sterilization function, and a lighting system having the same.

[0008] Another problem to be solved by the present disclosure is to provide a lighting device that can change the color temperature according to time like sunlight and has a sterilization function, and a lighting system having the same.

[0009] Another problem to be solved by the present disclosure is to provide a lighting device that can change the color temperature of sunlight according to the region and time and has a sterilization function, and a lighting system having the same.

[0010] An illuminating device according to an embodiment of the present disclosure includes: a first light-emitting unit including a first light-emitting diode (LED) and a first wavelength converter that emit light with a central wavelength in a range of 300 nm to 420 nm; a second light-emitting unit including a first second light-emitting diode (LED) and a second wavelength converter that emit light with a central wavelength in a range of 300 nm to 420 nm; a third light-emitting unit including a first third light-emitting diode (LED) and a third wavelength converter that emit light with a central wavelength in a range of 300 nm to 420 nm; and at least one second light-emitting diode (LED) that emits light with a central wavelength in a range of 400 nm to 420 nm, wherein the first wavelength converter, the second wavelength converter and the third wavelength converter respectively contain cyan wavelength conversion substances that convert light emitted from the light-emitting diodes into cyan light, and in an irradiance spectrum of light emitted to the outside, the irradiance of the central wavelength of light generated by each light-emitting diode in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit and emitted to the outside without wavelength conversion is smaller than the irradiance of the peak wavelength of cyan light emitted from each corresponding wavelength converter in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

[0011] An illumination device according to an embodiment of the present disclosure includes: a white light emitting device, comprising at least one first light emitting diode and a wavelength converter to realize white light; and at least one second light emitting diode, emitting light suitable for sterilizing at least one pathogenic microorganism, wherein the first light emitting diode emits light with a central wavelength in the range of approximately 300nm to 420nm, and the second light emitting diode emits light with a central wavelength in the range of approximately 400nm to 420nm, and the wavelength converter includes a plurality of wavelength conversion substances that convert the light of the first light emitting diode into white light, and the white light realized in the white light emitting device and the light generated in the second light emitting diode are emitted to the outside, and in the irradiance spectrum of the white light realized in the white light emitting device, the irradiance of the central wavelength of the light emitted from the first light emitting diode is smaller than the irradiance of the peak wavelength of the cyan light emitted from the cyan wavelength conversion substance.

[0012] A lighting device according to another embodiment of the present disclosure includes: a first light-emitting unit including a first light-emitting diode (LED) emitting light with a central wavelength in the range of about 300 nm to 420 nm and a first wavelength converter; a second light-emitting unit including a first second light-emitting diode (LED) emitting light with a central wavelength in the range of about 300 nm to 420 nm and a second wavelength converter; a third light-emitting unit including a first third light-emitting diode (LED) emitting light with a central wavelength in the range of about 300 nm to 420 nm and a third wavelength converter; and at least one second light-emitting diode (LED) emitting light with a central wavelength in the range of about 400 nm to 420 nm, wherein the first wavelength converter, the second wavelength converter and the third wavelength converter respectively contain cyan wavelength conversion substances that convert light emitted from the light-emitting diode into cyan light, and in the irradiance spectrum of light emitted to the outside, the irradiance of the central wavelength of light generated by each light-emitting diode in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit and emitted to the outside without wavelength conversion is smaller than the irradiance of the peak wavelength of the cyan light emitted from the wavelength converter.

[0013] In addition, yet another embodiment of the present disclosure provides a lighting system including the lighting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a graph showing the degree of danger according to the wavelength of cyan light.

[0015] Figure 2 FIG. 1 is a graph showing the spectrum of a white light source using a cyan light emitting diode according to the conventional technology.

[0016] Figure 3 It is a schematic top view for describing a lighting device according to an embodiment of the present disclosure.

[0017] Figure 4 yes Figure 3 A simplified cross-sectional view taken along the cutting line AA.

[0018] Figure 5 A representative spectrum of a lighting device according to an embodiment of the present disclosure is shown.

[0019] Figure 6 It is a schematic cross-sectional view of a lighting device for illustrating still another embodiment of the present disclosure.

[0020] Figure 7 It is a schematic cross-sectional view of a lighting device for illustrating still another embodiment of the present disclosure.

[0021] Figure 8 It is a schematic cross-sectional view of a lighting device for illustrating still another embodiment of the present disclosure.

[0022] Fig. 9 It is a schematic cross-sectional view of a lighting device for illustrating still another embodiment of the present disclosure.

[0023] Fig.10 is along Fig. 9 A simplified cross-sectional view taken along the cutting line BB.

[0024] Fig.11 FIG. 4 is a schematic cross-sectional view of a light emitting unit for describing still another embodiment of the present disclosure.

[0025] Fig.12 1 is a block diagram showing a lighting device 100 according to an embodiment of the present invention.

[0026] Fig.13 This is a sequence diagram showing a method of driving a light irradiation device according to an embodiment of the present invention.

[0027] Fig.14 This is a sequence diagram showing a method of driving a light irradiation device according to an embodiment of the present invention.

[0028] Fig.15a and Fig.15b It is a graph for explaining the results of the bactericidal test on Escherichia coli and Staphylococcus aureus according to the light irradiation amount of the second light emitting diode.

[0029] Fig.16 The photographs show the results of a bactericidal test on Escherichia coli cultured in a culture medium according to the light irradiation amount of the second light emitting diode. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. The embodiments introduced below are provided as examples so that the concept of the present invention can be fully conveyed to the general technicians in the technical field to which the present disclosure belongs. Therefore, the present disclosure is not limited to the embodiments described below, and may also be implemented in other forms. Moreover, in the accompanying drawings, the width, length, thickness, etc. of the constituent elements may also be enlarged for convenience. In addition, when it is recorded that a constituent element is "above" or "on" other constituent elements, it not only includes the situation that each part is "directly above" other parts or "directly on" other parts, but also includes the situation that other constituent elements are interposed between each constituent element and other constituent elements. Throughout the entire specification, the same reference numerals represent the same constituent elements.

[0031] An illumination device according to an embodiment of the present disclosure includes: a white light emitting device, comprising at least one first light emitting diode and a wavelength converter to realize white light; and at least one second light emitting diode, emitting light suitable for sterilizing at least one pathogenic microorganism, wherein the first light emitting diode emits light with a central wavelength in the range of approximately 300nm to 420nm, and the second light emitting diode emits light with a central wavelength in the range of approximately 400nm to 420nm, and the wavelength converter includes a plurality of wavelength conversion substances for converting the light of the first light emitting diode into white light, and the white light realized in the white light emitting device and the light generated in the second light emitting diode are emitted to the outside, and in the irradiance spectrum of the white light realized in the white light emitting device, the irradiance of the central wavelength of the light emitted from the first light emitting diode is smaller than the irradiance of the peak wavelength of the cyan light emitted from the cyan wavelength conversion substance.

[0032] In this specification, sterilization means killing or damaging pathogenic microorganisms to reduce or prevent the reproduction of pathogenic microorganisms.

[0033] By using a second light-emitting diode suitable for sterilizing pathogenic microorganisms together with a white light-emitting device, a lighting device with a sterilization function can be provided. Furthermore, the irradiance of the light emitted from the first light-emitting diode is smaller than the irradiance of the peak wavelength of the cyan light emitted from the cyan wavelength conversion material, thereby preventing damage to the human body or eye diseases or skin diseases caused by the first light-emitting diode.

[0034] In one embodiment, the wavelength converter may include wavelength conversion materials that convert the light of the first light emitting diode into cyan, green and red light. In other embodiments, the wavelength converter may include cyan and orange wavelength conversion materials that convert the light of the first light emitting diode into cyan and orange light.

[0035] The white light may be emitted after being mixed with the light emitted from the second light emitting diode. For example, the lighting device may further include a diffusion sheet for mixing the white light with the light emitted from the second light emitting diode.

[0036] The second light emitting diode may emit light having a central wavelength of about 405 nm. The wavelength of 405 nm does not induce eye diseases or skin diseases in the visible region and is suitable for sterilizing pathogenic microorganisms.

[0037] On the other hand, the wavelength converter may include a phosphor or a quantum dot. For example, the wavelength converter may include a cyan phosphor, a green phosphor, and a red phosphor. In an embodiment, these phosphors may be replaced individually or entirely by quantum dots.

[0038] In one embodiment, the light emitted from the second light emitting diode may be emitted to the outside without passing through the wavelength converter. In other embodiments, a part of the light emitted from the second light emitting diode may be converted in wavelength by the wavelength converter.

[0039] The irradiance of the light generated by the at least one second LED and emitted to the outside is greater than the irradiance of the light generated by the at least one first LED and emitted to the outside without wavelength conversion. Thus, the second LED can sterilize pathogenic microorganisms.

[0040] It may be that the lighting device comprises a greater number of first light emitting diodes than the at least one second light emitting diode, thereby the illumination of the white light emitting device is greater than that of the second light emitting diodes.

[0041] On the other hand, the irradiance of the light generated by the at least one second light emitting diode and emitted to the outside may be 1 W / m 2 the following.

[0042] Alternatively, the lighting device may further include a circuit substrate for mounting the first light emitting diode and the second light emitting diode.

[0043] In a specific embodiment, it may be that the first light emitting diode emits light with a central wavelength in the range of about 400nm to about 420nm. Furthermore, it may be that the first light emitting diode emits light with a central wavelength of about 405nm. In this case, a portion of the light emitted from the first light emitting diode can be emitted to the outside without wavelength conversion to sterilize pathogenic microorganisms. In particular, in the case where the white light emitting device realizes 6500K white light, the irradiance of the light with a central wavelength emitted from the first light emitting diode in the white light is relatively large compared with white light of other color temperatures, so it is possible to use the white light emitting device to sterilize pathogenic microorganisms without using the second light emitting diode. Therefore, in a specific embodiment, the second light emitting diode can be omitted.

[0044] Furthermore, according to the color temperature of white light achieved by the white light-emitting device, the irradiance of the light of the central wavelength emitted from the first light-emitting diode changes. Therefore, according to the change in irradiance, the irradiance of the light emitted from the second light-emitting diode can be changed to provide an irradiance suitable for sterilizing pathogenic microorganisms.

[0045] On the other hand, the lighting device may include: a position information receiving unit, which receives position information; and a control unit, which receives the position information from the position information receiving unit and controls the amount of light emitted from the white light emitting device. The control unit can calculate the amount of light that the white light emitting device should emit based on the position information, and control the amount of light to be emitted.

[0046] In one embodiment, the control unit may calculate an appropriate amount based on the position information provided by the position information receiving unit, and control the light source to emit the appropriate amount.

[0047] In other embodiments, the position information receiving unit may calculate the position information of the lighting device, and the control unit may receive the position information and calculate the amount of external light and the reasonable amount at the location where the lighting device is located, and control the light so as to emit an amount equal to the difference between the reasonable amount and the amount of external light.

[0048] In one embodiment, the control unit may calculate time information from the position information, and control the amount of light to be emitted by the white light emitting device according to the time information.

[0049] A lighting device according to another embodiment of the present disclosure includes: a first light-emitting unit including a first light-emitting diode (LED) and a first wavelength converter that emit light with a central wavelength in the range of about 300nm to 420nm; a second light-emitting unit including a first second light-emitting diode (LED) and a second wavelength converter that emit light with a central wavelength in the range of about 300nm to 420nm; a third light-emitting unit including a first third light-emitting diode (LED) and a third wavelength converter that emit light with a central wavelength in the range of about 300nm to 420nm; and at least one second light-emitting diode (LED) that emits light with a central wavelength in the range of about 400nm to 420nm, wherein the first wavelength converter, the second wavelength converter, and the third wavelength converter respectively contain cyan wavelength conversion substances that convert light emitted from the light-emitting diode into cyan light, and in the irradiance spectrum of light emitted to the outside, the irradiance of the central wavelength of light generated by each light-emitting diode in the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit and emitted to the outside without wavelength conversion is smaller than the irradiance of the peak wavelength of cyan light emitted from each corresponding wavelength converter in the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit.

[0050] Equipped with multiple light-emitting units, it can produce white light of various color temperatures.

[0051] On the other hand, the first wavelength converter, the second wavelength converter, and the third wavelength converter may further include a green wavelength conversion substance for converting the light emitted from the first light emitting diode into green light and a red wavelength conversion substance for converting the light into red light, respectively. Thus, the first light emitting unit, the second light emitting unit, and the third light emitting unit may respectively realize white light.

[0052] The first one LED, the first two LEDs and the first three LEDs may emit light with a central wavelength in the range of about 400nm to 420nm. The first one LED, the first two LEDs and the first three LEDs may emit light with the same peak wavelength, but are not limited thereto.

[0053] The light converted by the wavelength converter and the light emitted from the second light emitting diode may be mixed and then emitted to the outside. In addition, the mixed light may be white light.

[0054] Furthermore, the lighting device may further include a diffusion sheet suitable for mixing the light converted in wavelength by the wavelength converter and the light emitted from the second light emitting diode.

[0055] On the other hand, the first light emitting unit, the second light emitting unit and the third light emitting unit may emit white light of different color temperatures. In addition, the first light emitting unit, the second light emitting unit and the third light emitting unit may be driven independently.

[0056] Thus, the lighting device can change the color temperature in accordance with the change of sunlight over time.

[0057] On the other hand, the number of the first one light-emitting diode, the first two light-emitting diodes and the first three light-emitting diodes may be more than the number of the at least one second light-emitting diodes.

[0058] Alternatively, the lighting device may further include a circuit substrate on which the first one light-emitting diode, the first two light-emitting diodes, the first three light-emitting diodes, and the second light-emitting diode are mounted.

[0059] In one embodiment, the lighting device may also include: a position information receiving unit, which receives position information; and a control unit, which controls the amount of light emitted from the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit. The control unit may control the amount of light emitted from the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit based on the position information.

[0060] In one embodiment, the control unit may calculate a reasonable amount based on the position information provided by the position information receiving unit, and control the first light emitting unit, the second light emitting unit, and the third light emitting unit to emit light in a reasonable amount.

[0061] In one embodiment, the position information receiving unit may calculate the position information of the lighting device, the control unit receives the position information and calculates the amount of external light and the reasonable amount at the location where the lighting device is located, and controls the first light emitting unit, the second light emitting unit, and the third light emitting unit to emit the light having an amount that is the difference between the reasonable amount and the external amount.

[0062] In one embodiment, the control unit may calculate time information from the position information, and control the amount of light according to the time information.

[0063] A lighting system according to yet another embodiment of the present disclosure includes a lighting device arranged in an indoor space, wherein the lighting device is one of the lighting devices described above.

[0064] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0065] Figure 1 It is a graph showing the degree of danger according to the wavelength of cyan light.

[0066] It is well known that cyan light induces eye diseases or skin diseases, especially, the risk is strongest between 430nm and 440nm. Based on the highest risk value, the risk is more than 90% in the wavelength range of 420nm to 455nm, more than 70% in 413nm to 465nm, and more than 50% in 411nm to 476nm.

[0067] On the other hand, ultraviolet rays are harmful to the human body, and the most dangerous level is found between 270nm and 280nm.

[0068] Figure 2 This is the spectrum of a white light source using a cyan light-emitting diode according to conventional technology.

[0069] Reference Figure 2 In the past, white light sources used yellow phosphors together with cyan light-emitting diodes, or used green phosphors and red phosphors to achieve white light. The type and amount of phosphors can be adjusted according to the color temperature, and the higher the color temperature, the higher the intensity of cyan light.

[0070] The cyan light emitting diodes used for white light sources in the past have a central wavelength (peak wavelength) in the range of about 430nm to 470nm. Figure 1 Therefore, as the color temperature of the white light source increases, the intensity of the cyan light also increases, and the risk of inducing eye diseases or skin diseases increases.

[0071] Figure 3 is a schematic top view of a lighting device for illustrating an embodiment of the present disclosure. Figure 4 yes Figure 3 A simplified cross-sectional view taken along the cutting line AA.

[0072] Reference Figure 3 and Figure 4 The lighting device may include a circuit board 11 , a first light emitting diode 21 , a wavelength converter 23 and a second light emitting diode 31 .

[0073] The circuit board 11 may have a circuit pattern for supplying power to the first light emitting diode 21 and the second light emitting diode 31. The circuit board 11 may be a printed circuit board, for example, may be a metal-PCB.

[0074] The first light emitting diode 21 is used to realize a light source of white light, and at least one first light emitting diode 21 is mounted on the circuit board 11. The plurality of first light emitting diodes 21 may be electrically connected to each other in various ways, for example, in series, in parallel, or in series and parallel.

[0075] The first light emitting diode 21 may have a central wavelength in the range of, for example, about 300 nm to 420 nm. Furthermore, it may have a central wavelength in the range of 400 nm to 420 nm. In addition, since the first light emitting diode has a central wavelength in the range, a considerable portion of the light emitted from the first light emitting diode 21 can be wavelength-converted by the wavelength converter 23. In the case where the first light emitting diode 23 emits ultraviolet rays, most of the ultraviolet rays are wavelength-converted by the wavelength converter 23, thereby preventing the ultraviolet rays from being emitted to the outside. Furthermore, in the case of using a first light emitting diode having a central wavelength in the range of 400 nm to 420 nm, safety issues caused by ultraviolet rays can be eliminated in advance.

[0076] The wavelength converter 23 converts the wavelength of light emitted from the first light emitting diode 21. The wavelength converter 23 may be, for example, a phosphor or a molded part containing quantum dots. The wavelength converter 23 covers the first light emitting diode 21. In the case where a plurality of first light emitting diodes 21 are mounted on the circuit board 11, the wavelength converter 23 may cover all of the plurality of first light emitting diodes 21.

[0077] The wavelength converter 23 includes a wavelength conversion substance for realizing white light together with the light of the first light emitting diode 23. In one embodiment, the wavelength converter 23 may include a cyan phosphor, a green phosphor, and a red phosphor. In other embodiments, the wavelength converter 23 may include a cyan phosphor and an orange phosphor. In other embodiments, the wavelength converter may also include quantum dots.

[0078] Examples of cyan phosphors include BAM (Barium Magnesium Aluminate) series, Halo-Phosphate (halogenated phosphate) series, or aluminate series phosphors, such as BaMgAl 10 O 17 :Mn 2 + 、BaMgAl 12 O 19 :Mn 2+ or (Sr, Ca, Ba)PO4Cl:Eu 2+ The cyan phosphor may have a peak wavelength in the range of 440 to 500 nm, for example.

[0079] Examples of green phosphors include LuAG (Lu3(Al, Gd)5O 12 :Ce 3+ )、YAG(Y3(Al,Gd)5O 12 :Ce 3 + ), Ga-LuAG((Lu,Ga)3(Al,Gd)5O 12 :Ce 3+ ), Ga-YAG((Ga,Y)3(Al,Gd)5O 12 :Ce 3+ ), LuYAG((Lu,Y)3(Al,Gd)5O 12 :Ce 3+ ), Ortho-Silicate (Ortho-Silicate; (Sr, Ba, Ca, Mg)2SiO4:Eu 2+ ), Oxynitride; (Ba, Sr, Ca)Si2O2N2:Eu 2+ ), or thiogallate (Thio Gallate; SrGa2S4:Eu 2+ ). The green phosphor may have a peak wavelength in the range of 500 to 600 nm.

[0080] Examples of red phosphors include nitride, sulfide, fluoride or oxynitride series phosphors, and specifically CASN (CaAlSiN3:Eu 2 + )、(Ba,Sr,Ca)2Si5N8:Eu 2+ 、(Ca,Sr)S2:Eu 2+ ) or (Sr, Ca)2SiS4:Eu 2+ Etc. The red phosphor may have a peak wavelength in the range of 600 to 700 nm.

[0081] White light can be realized by the combination of the first light emitting diode 21 and the wavelength converter 23. Figure 5 Spectra of white light of various color temperatures achieved by the combination of the first light emitting diode 21 and the wavelength converter 23 are shown in FIG.

[0082] like Figure 5 As shown, white light of each color temperature is realized by a combination of light emitted from the first light emitting diode and light emitted from the phosphor. In addition, it can be confirmed that in all color temperatures, the irradiance of light emitted from the first light emitting diode 21 is smaller than the irradiance of light emitted from the cyan phosphor. As the color temperature increases, the irradiance of light emitted from the first light emitting diode 21 increases, but the irradiance of cyan light emitted from the cyan phosphor increases more. In addition, the irradiance of light emitted from the first light emitting diode may be smaller than the irradiance of light emitted from the green phosphor, and smaller than the irradiance of light emitted from the red phosphor.

[0083] Thus, eye diseases or skin diseases induced by the light emitted from the first light emitting diode can be prevented.

[0084] Refer again Figure 3 and Figure 4 The second light emitting diode 31 can be separated from the wavelength converter 23 and mounted on the circuit board 11. The light emitted from the second light emitting diode 31 can be emitted to the outside without substantially traveling toward the wavelength converter 23. Thus, the irradiance of the light emitted from the second light emitting diode 31 can be increased.

[0085] The second light emitting diode 31 may be connected to the first light emitting diode 21 in series or in parallel, or may be driven independently of the first light emitting diode 21 .

[0086] On the other hand, the second light emitting diode 31 emits light suitable for sterilizing pathogenic microorganisms other than white light. The second light emitting diode 31 can emit light having a central wavelength of, for example, about 400nm to 420nm, further about 400nm to 410nm, and further about 405nm. Although ultraviolet rays generally have outstanding sterilization ability, they are harmful to the human body and therefore cannot be used indoors or in public places where people are active. On the other hand, short-wavelength visible light in the range of 400nm to 420nm has a relatively low risk of eye diseases or skin diseases and has a strong sterilization ability against pathogenic microorganisms, and therefore can be suitably used in lighting devices.

[0087] Furthermore, light in the range of 400 nm to 420 nm is a wavelength range similar to that of the first light emitting diode 21 , and thus the second light emitting diode 31 can be effectively used in the lighting device using the first light emitting diode 21 .

[0088] In this embodiment, in order to add a sterilization function to the lighting device, the irradiance of the light emitted from the second light emitting diode 31 may be greater than the irradiance of the light emitted from the white light emitting device at the same wavelength. Furthermore, the irradiance of the light emitted from the second light emitting diode 31 may be greater than the irradiance of the light emitted from the first light emitting diode 21 to the outside of the lighting device with a central wavelength in the range of 300nm to 420nm. Therefore, in the lighting device of this embodiment, the sterilization function of the second light emitting diode 31 becomes dominant compared to the first light emitting diode 21.

[0089] On the other hand, the driving time of the second light emitting diode 31 may be the same as the driving time of the first light emitting diode 21, but is not limited thereto. The driving time of the second light emitting diode 31 may be adjusted according to the installation position of the lighting device. In particular, the use time or irradiance of the second light emitting diode may be adjusted in consideration of the harmfulness to the human body.

[0090] For example, the irradiance of the second light emitting diode 31 emitted from the lighting device may be 1 W / m 2 Below, and can be 0.1W / m 2 Below. 1W / m 2 Indicates the limit value of risk group 1 for cyan light in the range of 300 to 700 nm in the photobiological safety standard (IEC62471), 0.1 W / m 2 Corresponding to the exemption level (exempt). By making 1W / m 2 The less than full irradiance can be driven in the lighting device for a relatively long time to exert a bactericidal effect.

[0091] In the embodiment, although the second light emitting diode 31 is used to exert the sterilization function of the lighting device, a part of the light emitted from the first light emitting diode 21 can also contribute to the sterilization of pathogenic microorganisms. Figure 5 As shown, in the case of white light with a color temperature of 6500K, light with a relatively strong irradiance in a wavelength band suitable for sterilizing pathogenic microorganisms, for example, about 400nm to 420nm, more specifically about 405nm, is emitted. Therefore, in the case where the first light emitting diode 21 emits light with a central wavelength of about 400nm to about 420nm, the first light emitting diode 21 can also be used to sterilize pathogenic microorganisms, and in this case, the second light emitting diode 31 can be omitted.

[0092] In addition, when the color temperature is lower than 6500K, since light of a wavelength suitable for killing bactericidal microorganisms is emitted, the irradiance of light emitted from the first LED 21 in the spectrum of white light can be considered to adjust the illumination of light emitted from the second LED 31.

[0093] According to this embodiment, pathogenic microorganisms can be sterilized not only in indoor living spaces but also in spaces where a large number of people move around, such as airports and hospitals, thereby preventing human infection by pathogenic microorganisms.

[0094] Figure 6 It is a schematic cross-sectional view of a lighting device for describing another embodiment of the present disclosure.

[0095] Reference Figure 6 The lighting device of this embodiment is substantially the same as that of the reference Figure 3 and Figure 4 The lighting device described is similar, but the difference is that the wavelength converter 23 is formed on the first light emitting diode 21. Figure 3 and Figure 4 The wavelength converter 23 covers all of the first light emitting diodes 21 , but in this embodiment, each of the first light emitting diodes 21 is individually covered by the wavelength converter 23 .

[0096] Since the wavelength conversion material in the first light emitting diode 21 and the wavelength converter 23 is the same as described above, detailed description is omitted.

[0097] On the other hand, since the first light emitting diodes 21 are respectively covered by the wavelength converters 23, the second light emitting diodes 31 can be arranged between the first light emitting diodes 21. That is, as shown in the figure, the second light emitting diodes 31 can be evenly distributed between the first light emitting diodes 21, whereby the light emitted from the second light emitting diodes 31 can be mixed with the white light, thereby reducing the light emitted from the second light emitting diodes 31 being recognized externally. In order to protect from the influence of the external environment, the second light emitting diodes 31 can also be covered by a transparent molded portion.

[0098] In this embodiment, the second LED 31 may be connected to the first LED 21 in series or in parallel, but is not limited thereto. The second LED 31 may be mounted on the circuit board 11 in a manner of being driven independently of the first LED 21 .

[0099] On the other hand, as described in the previous embodiment, the light emitted from the first light emitting diode 21 to the outside can be used to sterilize pathogenic microorganisms, so the second light emitting diode 21 can also be omitted.

[0100] Figure 7 It is a schematic cross-sectional view of a lighting device for describing another embodiment of the present disclosure.

[0101] Reference Figure 7 The lighting device of this embodiment is substantially the same as that of the reference Figure 3 and Figure 4 The described lighting device is similar, but differs in that the second light emitting diode 31 is also covered by the wavelength converter 23 .

[0102] That is, the wavelength converter 23 covers not only the first light emitting diode 21 but also the second light emitting diode 31. Thus, the wavelength converter 23 can convert the wavelength of a part of the light emitted from the second light emitting diode 31.

[0103] On the other hand, since part of the light emitted from the second light emitting diode 31 is wavelength-converted by the wavelength converter 23, more second light emitting diodes 31 can be used compared to the previous embodiment in order to achieve a radiation intensity suitable for sterilization. On the other hand, since the light generated in the second light emitting diode 31 is wavelength-converted and used to achieve white light, the number of first light emitting diodes 21 can be reduced.

[0104] On the other hand, the second light emitting diodes 31 may be uniformly arranged between the first light emitting diodes 21, thereby being able to emit uniform light to the outside. However, the present disclosure is not limited thereto.

[0105] On the other hand, when the first LED 21 emits light having a central wavelength in the range of 300nm to 420nm, the number and intensity of the second LEDs 31 are adjusted so that the irradiance of the light generated in the second LEDs 31 and emitted to the outside without wavelength conversion is greater than the irradiance of the light generated in the first LED 21 and emitted to the outside without wavelength conversion.

[0106] Therefore, the lighting device of this embodiment also provides an effective sterilization function through the second light emitting diode 31 .

[0107] In a specific embodiment, the first LED 21 can emit light having a central wavelength in the range of about 400 nm to about 420 nm, the same as the second LED 31. Furthermore, the first LED 21 and the second LED 31 can also emit light having the same wavelength, for example, light having a wavelength of 405 nm.

[0108] Figure 8 It is a schematic cross-sectional view of a lighting device for describing another embodiment of the present disclosure.

[0109] Reference Figure 8 The lighting device of this embodiment is substantially the same as that of the reference Figure 3 and Figure 4 The lighting device described is similar, but differs in that it also includes a diffuser 51 .

[0110] The diffusion sheet 51 mixes the white light and the light emitted from the second light emitting diodes 31 to make the light uniform. Thus, the visibility of the light emitted from the second light emitting diodes 31 can be reduced.

[0111] Fig. 9 is a simplified cross-sectional view for illustrating a lighting device according to yet another embodiment of the present disclosure. Fig.10 is along Fig. 9 A simplified cross-sectional view taken along the cutting line BB.

[0112] Reference Fig. 9 and Fig.10 The lighting device of this embodiment includes a substrate 11, a first light emitting unit 122, a second light emitting unit 124, a third light emitting unit 126 and a second light emitting diode 31. The substrate 11 and the second light emitting diode 31 are similar to the reference Figure 3 and Figure 4 The descriptions are similar, so the detailed description is omitted to avoid repetition.

[0113] On the other hand, the first light emitting unit 122 includes a first light emitting diode 121a and a first wavelength converter 123a, the second light emitting unit 124 includes a first second light emitting diode 121b and a second wavelength converter 123b, and the third light emitting unit 126 includes a first third light emitting diode 121c and a third wavelength converter 123c.

[0114] Here, the 1-1 to 1-3 LEDs 121a, 121b, and 121c respectively emit light having a central wavelength in the range of about 300nm to 420nm. In particular, the 1-1 to 1-3 LEDs 121a, 121b, and 121c may have a central wavelength in the range of about 400nm to about 420nm. They may be the same LEDs or LEDs having different central wavelengths.

[0115] On the other hand, the first to third wavelength converters 121a, 121b, and 121c respectively include a cyan wavelength conversion substance that converts light emitted from the light emitting diode into cyan light. The first to third wavelength converters 123a, 123b, and 123c may also respectively include a green wavelength conversion substance that converts light emitted from the light emitting diode into green light and a red wavelength conversion substance that converts light emitted from the light emitting diode into red light. The cyan wavelength conversion substance, the green wavelength conversion substance, and the red wavelength conversion substance may be obtained from the reference Figure 3 and Figure 4 The cyan phosphor, green phosphor and red phosphor described above can be selected. In addition, these phosphors can be replaced by quantum dots.

[0116] On the other hand, the first to third light emitting units 122, 124, and 126 may emit white light of different color temperatures. To this end, the first to third wavelength converters may contain different wavelength conversion substances or different amounts of wavelength conversion substances.

[0117] In addition, the first to third light-emitting units 122, 124, and 126 can be driven independently. For example, the first light-emitting unit 122 can realize white light with a color temperature of 2700K, the second light-emitting unit 124 can realize white light with a color temperature of 4000K, and the third light-emitting unit 126 can realize white light with a color temperature of 6000K or 6500K. Thus, the first to third light-emitting units can be selectively driven during the day, so that the color temperature of the lighting device can be changed in accordance with the changes in sunlight. In several embodiments, the first to third light-emitting units 122, 124, and 126 can also be driven together. White light of various color temperatures can also be realized by combining the first to third light-emitting units 122, 124, and 126.

[0118] On the other hand, in the irradiance spectrum of the light emitted to the outside of the lighting device, the irradiance of the center wavelength of the light generated by each light emitting diode 121a, 121b, 121c in the first to third light emitting units 122, 124, 126 and emitted to the outside without wavelength conversion is smaller than the irradiance of the peak wavelength of the cyan light emitted from each corresponding wavelength converter 123a, 123b, 123c. Thus, the lighting device can prevent the induction of eye diseases or skin diseases.

[0119] The second light emitting diode 31 can be driven together when at least one of the first to third light emitting units 122, 124, 126 is driven. In addition, the second light emitting diode 31 can be driven independently of the first to third light emitting units 122, 124, 126, so when the first to third light emitting units 122, 124, 126 are not driven, the second light emitting diode 31 can also be driven. Therefore, at night when the lighting device is not used, the second light emitting diode 31 also works and can perform a sterilization effect.

[0120] On the other hand, the first to third light-emitting units 122, 124, 126 can also emit light suitable for sterilizing pathogenic microorganisms. For example, when at least one of the 1-1 to 1-ter light-emitting diodes 121a, 121b, 121c emits light with a central wavelength of about 400nm to about 420nm, especially a central wavelength of 405nm, these light-emitting units can be used to sterilize pathogenic microorganisms while realizing white light. Therefore, the irradiance of the light emitted from the first to third light-emitting units 122, 124, 126 can be considered to adjust the on / off of the second light-emitting diode 31 or the irradiance of the light emitted from the second light-emitting diode 31.

[0121] On the other hand, the first to third light emitting units 122, 124, 126 can be arranged so that the light emitting units are evenly distributed. In this embodiment, the second light emitting diode 31 is arranged outside the arrangement position of the first to third light emitting units 122, 124, 126, but it is not necessarily limited to this and can be arranged together with the first to third light emitting units.

[0122] In this embodiment, the first to third light-emitting units 122, 124, 126 have a structure in which wavelength converters 123a, 123b, 123c wrap light-emitting diodes 121a, 121b, 121c. For example, these light-emitting units may be chip-scale packages. However, the present disclosure is not limited thereto, and the light-emitting units 122, 124, 126 may be light-emitting elements in a conventional package form.

[0123] Fig.11 is a schematic cross-sectional view of a light emitting unit for illustrating yet another embodiment of the present disclosure. Fig.11 A light emitting element in a conventional package format is schematically shown.

[0124] Reference Fig.11 The first light emitting unit 122 includes a first light emitting diode 121a and a first wavelength converter 123a. The first light emitting diode 121a can be installed in the chamber of the housing 120, and the first wavelength converter 123a covers the light emitting diode 121a in the chamber. On the other hand, the first light emitting diode 121a can be electrically connected to the lead electrode through a bonding wire.

[0125] Fig.11 The package of is an example, and various types of packages can be used. In addition, the first wavelength converter 123a can also cover the light emitting diode 121a in various shapes.

[0126] On the other hand, here, it is representatively described that the first light emitting unit 122 , the second light emitting unit 124 and the third light emitting unit 124 may also be light emitting elements of the same package form.

[0127] In addition, the second light emitting diode 31 may also be provided as a light emitting element in a package form and mounted on the substrate 11. However, the second light emitting diode 31 may be covered with a transparent mold portion instead of being covered with a wavelength converter.

[0128] The lighting device of the present disclosure can change the color temperature of white light in accordance with the color temperature change of sunlight based on time. Furthermore, the lighting device of the present disclosure can change the color temperature of white light in consideration of the color temperature change of sunlight based on region.

[0129] Fig.12 1 is a block diagram showing a lighting device 100 according to an embodiment of the present invention.

[0130] Reference Fig.12 , an illumination device 100 of an embodiment of the present invention includes: a light source 30 that emits light; a position information receiving unit that receives position information; and a control unit 50 that receives position information from the position information receiving unit and controls the amount of light emitted from the light source 30. Here, the position information refers to information that can be obtained using GPS (global positioning system). On the other hand, the light source 30 refers to a white light source that realizes white light, and is any light source that can change the color temperature. For example, the light source 30 can be a white light emitting device including a first light emitting diode 21 and a wavelength converter 23, or first to third light emitting units 122, 124, 126, but it is not necessarily limited to this.

[0131] The position information receiving unit 40 receives the position information from the satellite by using GPS in order to calculate the current position information of the lighting device 100. That is, the position information may include latitude and longitude information, etc. The position information receiving unit 40 can grasp the current position information such as latitude and longitude of the lighting device 100 through the received position information. The position information obtained by the position information signal is provided to the control unit 50.

[0132] The control unit 50 calculates the amount of light that the light source 30 should emit based on the position information provided by the position information receiving unit 40, and controls the light source 30 to emit the corresponding amount of light. In other words, the control unit 50 can control whether the light is emitted, the amount of light, the intensity of the light, the emission time, etc. The control unit 50 can also control the amount of light emitted from the second light emitting diode 31 in order to sterilize pathogenic microorganisms together with the amount of light source 30. In particular, the control unit 50 can control the amount of light emitted from the second light emitting diode 31 according to the amount of white light source 30.

[0133] The power supply unit 60 is electrically connected to the control unit 50, and supplies power to the light source 30 and the position information receiving unit 40. In the figure, it is shown that the power supply unit 60 supplies power to the light source 30 and the position information receiving unit 40 through the control unit 50, but it is not limited thereto, and the light source 30 and the position information receiving unit 40 may also be directly connected to the power supply unit 60 respectively.

[0134] The light source 30 and the position information receiving unit 40 may be disposed on the substrate 11. However, the present disclosure is not limited thereto, and the position information receiving unit 40 may also be disposed on a substrate different from the substrate 11 on which the light source 30 is disposed.

[0135] Sunlight does not irradiate all places on the earth to the same extent. As the latitude is lower, the amount of sunlight is greater, and as the latitude is higher, the amount of sunlight is less. In addition, as the altitude is higher, the amount of sunlight is greater, and as the altitude is lower, the amount of sunlight is less. Therefore, depending on which country or place the user of the lighting device 100 is located, the time or degree of exposure to sunlight will be different.

[0136] In one embodiment of the present invention, the position of the lighting device 100 is grasped by utilizing position information, and after calculating the amount of sunlight at its position, visible light of an amount corresponding to the sunlight is irradiated to the user, thereby achieving the effect of exposure to sunlight within a range that is harmless to the human body.

[0137] This is described below with reference to the drawings.

[0138] Fig.13 This is a sequence diagram showing a method of driving a light irradiation device according to an embodiment of the present invention.

[0139] Reference Fig.13 The position information receiving unit receives the position information (S11). For example, based on the position information obtained from the position information receiving unit, it can be determined that the light irradiation device is located in the city B in the country A.

[0140] The received location information is provided to the control unit, and the control unit confirms or calculates the reasonable amount of light that the light irradiation device should emit based on the location information (S13). For example, if the city B in country A is confirmed, in addition to the latitude or longitude information of city B in country A, information such as sunrise time, sunset time and average sunshine amount can also be calculated. If the latitude and longitude information is used, the sunrise and sunset times at the latitude and longitude can be easily confirmed, and the control unit can be configured to use an algorithm for calculating the sunrise and sunset times at the current latitude and longitude to determine whether it is daytime or nighttime, etc.

[0141] The control unit uses information such as sunrise time, sunset time, and average sunshine to calculate the start time, shut down time, and light intensity of the light source, so as to achieve a degree of approximation to the actual sunlight, that is, a reasonable degree of usage. In particular, it can correctly distinguish daytime or nighttime without the supplement of illumination sensors, and reasonably adjust whether the light source unit is irradiated.

[0142] Information such as the sunrise time, sunset time, and average sunshine amount at each location may be stored in a separate memory within the control unit, or may be easily acquired by connecting to an additional Internet connection, etc.

[0143] The control unit starts or turns off the light source so that light corresponding to the calculated reasonable amount is irradiated from the light source to the user (S15). The user can be irradiated with a dosage substantially equal to that of sunlight at the place where he is, even without going outdoors.

[0144] According to an embodiment of the present invention, for example, a user who lives indoors for a long time, stays in a ward or a limited space, or is mainly active at night, can receive light similar to the sunlight in the place where he is currently located at a reasonable time and in a reasonable amount even if he is in an environment where it is difficult to be exposed to sunlight. As a result, the user can stay in a familiar environment, can be psychologically stable, can also adjust the exposure time by setting the sunrise or sunset time, etc., and can easily restore the daily physiological rhythm.

[0145] The above-mentioned embodiment describes the use of a separate lighting device instead of sunlight based on location information, but an embodiment of the present invention is not limited thereto, and can be used as a supplementary light source to supplement the insufficient external light in the presence of natural light emitted from sunlight or a lighting device, that is, external light. For example, when located in a place with high latitudes, the amount of sunlight may be significantly lower than that in a place with low latitudes. In this case, it is necessary to supplement the insufficient sunlight. When the amount of sunlight is low, the light in the visible light band irradiated to the user is obviously insufficient, and the light in the ultraviolet light band may also be insufficient. In this case, the light irradiation device of an embodiment of the present invention can play a role in supplementing the insufficient light by supplementing the insufficient light in the visible light band and the light in the ultraviolet light band.

[0146] Fig.14 This is a diagram showing the spectrum of light emitted from a light source in a light irradiation device according to another embodiment of the present invention.

[0147] Reference Fig.14 The position information receiving unit receives the position information from the satellite (S21). For example, it can be determined that the light irradiation device is located in the city D of the country C based on the position information obtained from the position information receiving unit.

[0148] The received location information is provided to the control unit, which calculates the current sunrise time, sunset time, average sunshine amount and other information at its location based on the location information, and uses the sunrise time, sunset time, average sunshine amount and other information to calculate the current actual sunlight usage (S23).

[0149] Next, the difference between the reasonable amount required by the user and the current amount is calculated (S25). For example, when the city D in country C is located in a high-latitude area and the amount of sunshine is insufficient, the amount of sunshine actually required is the reasonable amount, and the value of subtracting the current amount from the reasonable amount is the insufficient amount. The reasonable amount required by the user can be stored in a separate memory in the control unit, or can be easily obtained by connecting to an additional Internet, etc.

[0150] The control unit turns on or off the light source so that the light source irradiates the object to be processed with an amount corresponding to the difference between the calculated appropriate amount and the external light amount, that is, light corresponding to the insufficient amount (S27).

[0151] The user is not restricted to the place where he is and can be irradiated with the predetermined light of the most reasonable degree for the user.

[0152] Various lighting devices have been described above, but the present disclosure is not limited to these specific embodiments. In addition, the lighting device is not only installed in indoor living spaces, but also in indoor spaces used by a large number of people such as hospitals or airports. Therefore, a lighting system provided with the lighting device can be provided. The lighting system is suitable for daily sterilization of pathogenic microorganisms, and the lighting device can also be activated according to the time when people are inactive to effectively sterilize pathogenic microorganisms.

[0153] Fig.15a and Fig.15b is a graph for explaining the results of a bactericidal test on Escherichia coli and Staphylococcus aureus according to the light irradiation amount of the second light emitting diode. Fig.16 The photographs show the results of a sterilization test on cultured Staphylococcus aureus according to the light irradiation amount of the second light emitting diode. Here, the second light emitting diode uses a light emitting diode having a central wavelength of 405 nm.

[0154] Each bacterium was smeared on a bacterial culture medium and cultured at 35-37°C for one day. The colonies formed on the bacterial culture medium were collected, turbidized with physiological saline, centrifuged, and the upper liquid was removed and then put back into physiological saline to prepare a bacterial solution. The bacterial solution was diluted to prepare a bacterial solution of a concentration suitable for the bactericidal test.

[0155] On the other hand, after setting a sterilizing light source at a specific distance from the container containing the bacterial solution, light was irradiated. In order to confirm the sterilizing power of the irradiated bacterial solution, the bacterial solution was diluted and evenly applied on a culture medium and cultured at 35-37°C for one day.

[0156] The colonies formed on the bacterial culture medium were confirmed, multiplied by the dilution factor, and counted.

[0157] Fig.15a and Fig.15b The curve graph shows the bactericidal power according to the light irradiation dose (dose) compared with the number of bacteria in the control group without a bactericidal light source. It can be confirmed that the more the light irradiation dose (dose) increases, the more the bactericidal power of pathogenic microorganisms increases. Here, 1 on the y-axis represents 90% bactericidal power, 2 represents 99% bactericidal power, and 3 represents 99.9% bactericidal power. Therefore, it can be known that the light irradiation dose is about 20J / cm 2 Up to 30J / cm 2 The range shows about 90% bactericidal power, at about 50J / cm 2 Up to 60J / cm 2 The range shows about 99% bactericidal power, at about 80J / cm 2 Up to 95J / cm 2 The range shows about 99.9% bactericidal power.

[0158] In addition, refer to Fig.16 It can be confirmed that the more the light irradiation dose increases, the more the number of bacteria decreases, and it can be known that as the number of bacteria decreases, the size of the colony increases. On the other hand, if the light irradiation dose is further increased, the bacteria are almost removed and cannot be observed.

[0159] On the other hand, the spectrum of the conventional light source (comparative example) is shown in Table 1 below. Figure 2 ) and the spectrum of the light source (embodiment) of this embodiment ( Figure 5 ) derived from the relative intensity, relative light usage and relative bactericidal power of 405nm wavelength based on the color temperature of the white light source.

[0160] [Table 1]

[0161]

[0162] Referring to Table 1, it can be seen that the intensity at a wavelength of 405 nm is the highest for the light source of the embodiment with a color temperature of 6500 K, and is relatively low for the light source of the embodiment with a color temperature of 3000 K. On the other hand, the light source of the comparative example also shows a very low intensity at a color temperature of 6500 K, and shows a lower intensity than the 3000 K light source of the embodiment at all color temperatures.

[0163] In the example, the light dosage of the 6500K light source is set to 90 J / cm 2When the light consumption of other light sources is recorded in the table under the same conditions, the light consumption of the light sources of the embodiment with a color temperature of 5000K or less shows a light consumption that is 1 / 2 of the light consumption of the color temperature of 6500K. On the other hand, the light source of the comparative example shows a light consumption that is smaller than the light source of 3000K of the embodiment.

[0164] On the other hand, regarding the bactericidal effect on Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), when the bactericidal effect of the light source with a color temperature of 6500K in the example is set to 100%, the bactericidal effects of other light sources are recorded in the table as relative values ​​under the same irradiation time.

[0165] As can be seen from Table 1, it can be seen that the light source of the example shows a relatively strong sterilization power at a color temperature of 6500K.

[0166] Although various embodiments of the present disclosure have been described above, the present invention is not limited to these embodiments. In addition, the content or constituent elements described for one embodiment may also be applied to other embodiments without departing from the technical concept of the present invention.

Claims

1. A lighting device, comprising: The first light emitting unit comprises a first light emitting diode emitting light having a central wavelength in a range of 300 nm to 420 nm and a first wavelength converter; The second light emitting unit includes a first light emitting diode and a second wavelength converter that emits light having a central wavelength in the range of 300 nm to 420 nm; The third light emitting unit includes a first third light emitting diode emitting light having a central wavelength in the range of 300 nm to 420 nm and a third wavelength converter; as well as at least one second light emitting diode, emitting light with a central wavelength in the range of 400 nm to 420 nm, The first wavelength converter, the second wavelength converter, and the third wavelength converter each include a cyan wavelength conversion material that converts light emitted from a light emitting diode into cyan light. In the irradiance spectrum of the light emitted to the outside, the irradiance of the central wavelength of the light generated by each light emitting diode in the first light emitting unit, the second light emitting unit and the third light emitting unit and emitted to the outside without wavelength conversion is smaller than the irradiance of the peak wavelength of the cyan light emitted by the wavelength conversion performed by each corresponding wavelength converter in the first light emitting unit, the second light emitting unit and the third light emitting unit, The irradiance of light emitted from the second light emitting diode is adjusted according to a change in the irradiance of the center wavelength of light generated by each of the first to third light emitting units and emitted to the outside without wavelength conversion.

2. The lighting device according to claim 1, wherein: The first wavelength converter, the second wavelength converter and the third wavelength converter further include a green wavelength conversion substance that converts the light emitted from the first one LED, the first two LEDs and the first three LEDs into green light and a red wavelength conversion substance that converts the light emitted from the first one LED, the first two LEDs and the first three LEDs into red light respectively.

3. The lighting device according to claim 1, wherein: The first one LED, the first two LEDs and the first three LEDs emit light with a central wavelength ranging from 400nm to 420nm.

4. The lighting device according to claim 1, wherein: The lighting device further includes a diffusion sheet adapted to mix the light wavelength-converted by the wavelength converter and the light emitted from the second light emitting diode.

5. The lighting device according to claim 1, wherein: The first light emitting unit, the second light emitting unit and the third light emitting unit emit white light with different color temperatures.

6. The lighting device according to claim 5, wherein: The first light emitting unit, the second light emitting unit and the third light emitting unit are driven independently.

7. The lighting device according to claim 1, wherein: The lighting device comprises: a position information receiving unit, receiving the position information; and a control unit that receives the position information from the position information receiving unit and controls the amount of light emitted from the first light emitting unit, the second light emitting unit, the third light emitting unit, and the second light emitting diode, The control unit calculates the amount of light that the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the second light-emitting diode should emit based on the position information, and controls the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and the second light-emitting diode to emit the calculated amount of light.

8. The lighting device according to claim 7, wherein: The control unit calculates an appropriate amount based on the position information provided from the position information receiving unit, and controls the first light emitting unit, the second light emitting unit, the third light emitting unit, and the second light emitting diode to emit an appropriate amount.

9. The lighting device according to claim 7, wherein: The position information receiving unit calculates the position information of the lighting device, The control unit receives the position information and calculates the amount of external light and the reasonable amount at the location where the lighting device is located, and controls the first light-emitting unit, the second light-emitting unit, the third light-emitting unit and the second light-emitting diode to emit the difference between the reasonable amount and the amount of external light.

10. The lighting device according to claim 7, wherein: The control unit calculates time information from the position information, and controls the amount of light to be emitted by the first light emitting unit, the second light emitting unit, and the third light emitting unit according to the time information.

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