A lighting method and apparatus for simulating sunlight and sky.

Abstract

A method and apparatus for simulating sunlight and sky illumination are disclosed. The method includes calculating the sky light color at different celestial altitudes in a given region, and the PWM signal information required to control the corresponding LED light source module, based on the volumetric scattering coefficient of the atmosphere in different regions and the photoelectric parameters of the LED light source module. Based on the solar altitude angle, atmospheric optical quality, and extraterrestrial radiation spectrum, the method calculates the sunlight color at different times, and the PWM signal information required to control the corresponding LED light source module. In response to a user command, the LED driver module outputs the PWM signal information to control the LED light source module. This invention enables the simulation of sky light color at different celestial altitudes in different regions, the color of sunlight at different times and dates in different geographical locations, the change from sky light color to sunlight color, and the synchronous change of sky light color and sunlight color.

Description

Technical Field

[0001] This invention relates to the field of lighting technology, and more specifically to a lighting method and apparatus for simulating sunlight and sky. Background Technology

[0002] In recent years, driven by market demand, many lighting manufacturers have launched lighting solutions that simulate sky effects. For example, they might print blue sky and white cloud patterns on traditional flat panel lights and illuminate the pattern with a light source to create the effect; or they might add blue LED beads to the light source to increase the blue light index in the projected light, thus simulating a blue sky. To be precise, existing sky light solutions are essentially blue sky lights, and these solutions have the following problems:

[0003] 1) The colors are monotonous, with only fixed shades of blue or white, without considering that the hue of the sky varies at different altitudes.

[0004] 2) Excessive blue light intensity can easily lead to lethargy in users after prolonged use;

[0005] 3) It did not consider that sunlight should also be an important component of skylights, nor did it take into account the color of the sky and the possible superposition effect of sunlight and skylight. Summary of the Invention

[0006] To address the aforementioned technical problems in the prior art, this invention proposes an illumination method for simulating sunlight and the sky, comprising:

[0007] S1: Calculate the sky light color points at different sky element heights in a certain region and the PWM signal information required to control the corresponding LED light source modules based on the volume scattering coefficient of the atmosphere in different regions and the photoelectric parameter information of the LED light source modules.

[0008] S2: Based on the solar elevation angle, atmospheric optical quality, and extraterrestrial radiation spectrum, the solar color point and photoelectric parameter information of the LED light source module are obtained. The solar color point at different times and the PWM signal information required to control the corresponding LED light source module are calculated.

[0009] S3: In response to receiving a user instruction, the LED driver module outputs the PWM signal information to control the LED light source module to reproduce the sky light color point and / or the sunlight color point.

[0010] In a preferred embodiment, the method for calculating the sky color points at different sky element heights in the illumination method for simulating sunlight and sky is as follows:

[0011] The spectrum P1 after atmospheric scattering is calculated using the extraterrestrial spectrum P0. The atmospheric scattering spectrum P1 is calculated using the following formula:

[0012]

[0013] Among them, a mλ It is the volumetric scattering coefficient of the atmosphere in the corresponding region;

[0014] The tristimulus values ​​X, Y, Z of skylight and the color coordinates x, y are calculated using the following formulas:

[0015]

[0016]

[0017]

[0018]

[0019]

[0020] Calculate the relationship between different sky element heights A and the color purity α of sky light, using the formula α = f(A);

[0021] Calculate the relationship between the sky color coordinates x at the zenith and the color purity α: x = g(α);

[0022] Calculate the relationship between the sky color coordinates y at the zenith and the color purity α, using the formula y = h(α);

[0023] Based on the relationships between different sky element heights A and the color purity α of sky light, the relationships between the sky light color coordinates x and y at the zenith and the color purity α, the sky light color points at different sky element heights are calculated. The PWM signal information required to control the corresponding LED light source module is then calculated using the sky light color points at the aforementioned sky element heights and the photoelectric parameter information of the LED light source module. This PWM signal information is then used to control the corresponding light source module to simulate the sky light colors at different sky element heights in different regions.

[0024] In a preferred embodiment, the LED driver module of the lighting method for simulating sunlight and sky can output two PWM signals.

[0025] In a preferred embodiment, the light source combination in the LED light source module includes:

[0026] A combination of two blue light sources, wherein the color purity of the blue light sources is between 10% and 45%, and the dominant wavelength is between 480±7nm; or

[0027] A combination of a blue light source and a white light source with color coordinates within a 7-step color tolerance range of (0.3333, 0.3333) is used. The blue light source has a color purity range of 40% ± 5% and a dominant wavelength range of 480 ± 7 nm. The 7-step color tolerance range is either a 7-step McAdam ellipse or a 7-step square. Based on the PWM signal information required to control the corresponding LED light source module, calculated from the sky light color point at the given sky element altitude and the photoelectric parameter information of the LED light source module, two PWM signals are output to control the light source combination of the LED light source module, thereby simulating the sky light color at different sky element altitudes in different regions.

[0028] In a preferred embodiment, the calculation method for the solar color points at different times is as follows: The Earth's surface spectrum, after scattering and absorption, is calculated at different altitude angles. The solar color points are then calculated using this surface spectrum to construct the relationship between the changes in the solar color points at different solar altitude angles. The solar altitude angle is then converted into time to obtain the solar color points at different times. The PWM signal information required to control the corresponding LED light source module is calculated using the solar color points at different times and the photoelectric parameter information of the LED light source module, thus simulating the color of sunlight at different geographical locations, dates, and times.

[0029] In a preferred embodiment, the light source combination in the LED light source module includes:

[0030] Two white light sources with different color temperatures and one blue light source with a dominant wavelength of 480±7nm and a color purity of 40%±5%; or

[0031] Three white light sources with different color temperatures and one blue light source with a main wavelength of 480±7nm and a color purity of 40%±5%.

[0032] In a preferred embodiment, the LED driver module can output at least three PWM signals, two of which control the white light mixed with an intermediate color temperature, and the other controls the blue light source. Based on the photoelectric parameter information of the sunlight color point and the LED light source module received by the LED driver module at different times, the required PWM signal information for controlling the corresponding LED light source module is calculated, and at least three PWM signals are output to control the light source combination of the LED light source module, thereby simulating the sunlight color at different geographical locations, dates, and times.

[0033] In a preferred embodiment, the method further includes switching between sky light color points and sunlight color points at different times, specifically including:

[0034] Calculate the color temperature of sunlight at different times;

[0035] Calculate the duty cycles η1, η2, and η3 required to mix two or three white light sources to produce the corresponding color temperature;

[0036] The duty cycles of the blue light and the mixed light source are linearly varied by a coefficient according to k1+k2(η1, η2, η3)=1, where k1 is the duty cycle of the blue light source, k2 is the duty cycle of the mixed light source after two / three light mixing, and the scaling factor is the duty cycle of the two / three white light sources.

[0037] The calculated duty cycle is output to the LED driver module, controlling the LED light source module to achieve a uniform switching between the sky light color point and the sunlight color point at different times. This achieves the change from sky light color to sunlight color.

[0038] The present invention also provides a lighting device for simulating sunlight and sky, comprising:

[0039] The calculation module is configured to calculate the sky light color point at different sky element heights in a certain region and the PWM signal information required to control the corresponding LED light source module based on the atmospheric volume scattering coefficient and photoelectric parameter information of the LED light source module in different regions; it calculates the solar light color point and photoelectric parameter information of the LED light source module based on the solar altitude angle, atmospheric optical quality, and extraterrestrial radiation spectrum, and calculates the solar light color point at different times and the PWM signal information required to control the corresponding LED light source module.

[0040] The LED driver module is configured to output the PWM signal information in response to a received user instruction to control the LED light source module to reproduce the sky light color point and / or the sunlight color point.

[0041] In a preferred embodiment, the lighting device includes two light-emitting areas, one for simulating sunlight and the other for simulating skylight, wherein the duty cycle of the blue light source in the skylight-simulating area satisfies...

[0042]

[0043] Where A is the distance from the color point of the sunlight region to the equal-energy white point, and B is the distance from the color point of the blue light source to the equal-energy white point. By controlling the corresponding light source module through the duty cycle, the color changes of sky light and sunlight are synchronously realized.

[0044] The technical advantages of this invention are as follows:

[0045] 1) It can simulate the color of skylight at different altitudes in different regions, solving the problem of monotonous color tones in existing skylight solutions;

[0046] 2) It can simulate the color of sunlight under different geographical locations, dates and times, and introduce simulated sunlight into the sky light to more closely resemble the changes in the actual sky. By using simulated sunlight to neutralize the blue of the simulated sky light, it solves the problem that users may feel depressed after using the blue sky light for a long time.

[0047] 3) It can realize the change from sky light color to sunlight color, realize dynamic light change, add dimming and color adjustment functions to lamps, and meet the special color needs of users;

[0048] 4) It can simultaneously realize the changes in sky light color and sunlight color, realize the simulation of sunlight at different times, and at the same time simulate the affected sky light color, thereby achieving the effect of natural light entering the room. Attached Figure Description

[0049] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0050] Figure 1 A flowchart of an illumination method for simulating sunlight and sky according to an embodiment of the present invention is shown;

[0051] Figure 2 A flowchart illustrating the calculation of sky color points at different sky element heights according to a specific embodiment of the present invention is shown.

[0052] Figure 3 An example diagram of extraterrestrial radiation spectrum according to a specific embodiment of the present invention is shown;

[0053] Figure 4 A flowchart illustrating the calculation of sunlight color points at different times according to a specific embodiment of the present invention is shown;

[0054] Figure 5 A circuit diagram showing the output of two PWM signals by an LED driver module according to a specific embodiment of the present invention is provided.

[0055] Figure 6 The diagram illustrates the changes in sky light color points, LED light source module duty cycle, and sky light color at different sky element heights in the Xiamen area under a simulated clear, cloudless day according to a specific embodiment of the present invention.

[0056] Figure 7A circuit diagram showing the output of three PWM signals by an LED driver module according to a specific embodiment of the present invention is provided.

[0057] Figure 8 This diagram illustrates the variation of sky light color points to sunlight color points at noon, according to a specific embodiment of the present invention.

[0058] Figure 9 A block diagram of an illumination device for simulating sunlight and sky is shown according to an embodiment of the present invention;

[0059] Figure 10 An example diagram of two light-emitting regions according to a specific embodiment of the present invention is shown;

[0060] Figure 11 An example diagram of a light source combination of LED light source modules in two light-emitting regions according to a specific embodiment of the present invention is shown.

[0061] Figure 12 An example diagram of a second light source combination of LED light source modules in two light-emitting regions according to a specific embodiment of the present invention is shown;

[0062] Figure 13 A circuit diagram showing the output of four PWM signals by an LED driver module according to a specific embodiment of the present invention is provided.

[0063] Figure 14 A diagram showing the color distribution of the sunlight area and the skylight area according to a specific embodiment of the present invention is provided. Detailed Implementation

[0064] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0065] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0066] Example 1

[0067] According to an embodiment of the present invention, an illumination method for simulating sunlight and sky is provided.

[0068] Figure 1 A flowchart of an illumination method for simulating sunlight and sky according to an embodiment of the present invention is shown, such as... Figure 1 As shown, the method includes:

[0069] S1: Based on the volume scattering coefficient of the atmosphere in different regions and the photoelectric parameter information of the LED light source module, calculate the sky light color point at different sky element heights in a certain region and the PWM signal information required to control the corresponding LED light source module.

[0070] In a specific embodiment, Figure 2 A flowchart illustrating the calculation of sky color points at different sky element altitudes according to a specific embodiment of the present invention is shown, such as... Figure 2 As shown, the calculation method for the sky light color points at different sky element altitudes is as follows:

[0071] The extraterrestrial spectrum P0 is used to calculate the spectrum P1 after scattering through the atmosphere, where the extraterrestrial spectrum P0 is as follows: Figure 3 As shown, the spectrum P1 after atmospheric scattering is calculated using the following formula:

[0072]

[0073] Among them, a mλ λ is the volumetric scattering coefficient of the atmosphere in the corresponding region. This value varies in different geographical locations. λ is the wavelength of light, N is the standard atmospheric density, and n is the refractive index of air.

[0074] The tristimulus values ​​X, Y, Z of skylight and the color coordinates x, y are calculated using the following formulas:

[0075]

[0076]

[0077]

[0078]

[0079]

[0080] Calculate the relationship between different sky element heights A and the color purity α of sky light, using the formula α = f(A);

[0081] Calculate the relationship between the sky color coordinates x at the zenith and the color purity α: x = g(α);

[0082] Calculate the relationship between the sky color coordinates y at the zenith and the color purity α, using the formula y = h(α);

[0083] Based on the relationships between different sky element heights A and the color purity α of sky light, the relationships between the sky light color coordinates x and y at the zenith and the color purity α, the sky light color points at different sky element heights are calculated. The PWM signal information required to control the corresponding LED light source module is then calculated using the sky light color points at the aforementioned sky element heights and the photoelectric parameter information of the LED light source module.

[0084] S2: Based on the solar elevation angle, atmospheric optical quality, and extraterrestrial radiation spectrum, the solar color point and photoelectric parameter information of the LED light source module are calculated to obtain the solar color point at different times, as well as the PWM signal information required to control the corresponding LED light source module.

[0085] In specific embodiments, such as Figure 4 As shown, the calculation method for the solar color point at different times is as follows: The Earth's external radiation spectrum after scattering and absorption, i.e., the surface spectrum, is calculated at different altitude angles. The solar color point is then calculated using the surface spectrum to construct the relationship between the solar color point changes at different solar altitude angles. The solar altitude angle is converted into time to obtain the solar color point at different times. The PWM signal information required to control the corresponding LED light source module is then calculated using the solar color point at different times and the photoelectric parameter information of the LED light source module.

[0086] S3: In response to receiving a user instruction, the LED driver module outputs the PWM signal information to control the LED light source module to reproduce the sky light color point and / or the sunlight color point.

[0087] In a specific embodiment, in response to receiving a user instruction, the user instruction may be an APP, a remote control, or a rotary switch, etc.

[0088] In specific embodiments, such as Figure 5 As shown, the LED driver module outputs two PWM signals. Specifically, the LED driver module is... Figure 5 The drive control module shown has a control unit connected to it to output drive control signals. An auxiliary power supply circuit is connected to the drive control module to supply power. The drive control module is connected to a CC control circuit and a complementary control circuit. The CC control circuit and the complementary control circuit are connected to the two light source combinations of the LED light source module. The drive control module outputs PWM dimming signals C and W to the complementary control circuit to control the two light source combinations of the LED light source module respectively.

[0089] In a specific embodiment, the light source combination in the LED light source module includes: a combination of two blue light sources, wherein the color purity of the blue light source is between 10% and 45%, and the dominant wavelength is between 480±7nm; or a combination of one blue light source and one white light source with color coordinates within a 7-step color tolerance range of (0.3333, 0.3333), wherein the color purity of the blue light source is between 40% and 5%, and the dominant wavelength is between 480±7nm, and the 7-step color tolerance range is a 7-step McAdam ellipse or a 7-step square.

[0090] In an optional embodiment, the LED driver module can output a PWM signal to control the LED light source module based on the preset sky light color point information at different sky element heights in a certain region and the PWM signal information required by the corresponding LED light source module, so as to realize the reproduction of the sky light color at a certain sky element height.

[0091] In an optional embodiment, the PWM signal information required to control the corresponding LED light source module can be calculated based on the photoelectric parameter information of the sky light color point and the LED light source module at the sky element height received by the LED driver module. Two PWM signals are output to control the light source combination of the LED light source module, thereby simulating the sky light color at different sky element heights in different regions.

[0092] To verify the method of this embodiment, the light source combination of the LED light source module is set to use...

[0093] Light source 1: A blue LED with color coordinates (0.3048, 0.3222) and a color purity of 10.5%.

[0094] Light source 2: A blue LED with color coordinates (0.2270, 0.2921) and a color purity of 39.1%. This simulates the changes in sky light color point, LED light source module duty cycle, and sky light color at different sky heights in Xiamen under a clear, cloudless sky. Figure 6 As shown, the purity of the blue color of the sky light gradually increases with the increase of the sky's altitude.

[0095] In summary, the lighting method for simulating sunlight and sky in the above embodiments of the present invention can simulate the color of sky light at different altitudes in different regions, thus solving the problem of monotonous color tones in existing skylight solutions.

[0096] Example 2

[0097] According to Embodiment 2 of the present invention, an illumination method for simulating sunlight and sky is also provided. The difference between the illumination method for simulating sunlight and sky in this embodiment and the illumination method for simulating sunlight and sky in Embodiment 1 is as follows:

[0098] The light source combination in the LED light source module includes:

[0099] Two white light sources with different color temperatures and one blue light source with a dominant wavelength of 480±7nm and a color purity of 40%±5%; or

[0100] Three white light sources with different color temperatures and one blue light source with a main wavelength of 480±7nm and a color purity of 40%±5%. The white light sources can be conventional white LED light sources or full-spectrum light sources.

[0101] like Figure 7 As shown, the LED driver module outputs three PWM signals. Specifically, the LED driver module is... Figure 7 The drive control module shown has a control unit connected to it to output drive control signals. The control unit is also connected to a CV control circuit to output CV control signals. The CV control circuit is also connected to two CC control circuits. An auxiliary power supply circuit is connected to the drive control module to supply power. The drive control module is connected to two CC control circuits and a complementary control circuit. One CC control circuit and the complementary control circuit are connected to two white light sources with different color temperatures from the LED light source module. The other CC control circuit is directly connected to one blue light source from the LED light source module. The drive control module outputs PWM dimming signals C, W, and BLUE to the complementary control circuit to control the two white light sources and one blue light source from the LED light source module, respectively.

[0102] In a specific embodiment, the LED driver module receives the photoelectric parameter information of the sunlight color point and the LED light source module at different times to calculate and control the PWM signal information required for the corresponding LED light source module, and outputs at least three PWM signals to control the light source combination of the LED light source module, thereby simulating the sunlight color at different geographical locations, dates and times.

[0103] In a specific embodiment, the method also includes switching between sky light color points and sunlight color points at different times, specifically including:

[0104] Calculate the color temperature of sunlight at different times;

[0105] Calculate the duty cycles η1, η2, and η3 required to mix two or three white light sources to produce the corresponding color temperature;

[0106] The duty cycles of the blue light and the mixed light source are linearly varied according to the coefficient k1 + k2(η1, η2, η3) = 1, where k1 is the duty cycle of the blue light source, k2 is the duty cycle of the mixed light source after two / three-way mixing, and the corresponding scaling factor is the duty cycle of the two / three-way white light source. The calculated duty cycle is output to the LED driver module to control the LED light source module to achieve a uniform switching between the sky light color point and the sunlight color point at different times. This achieves the change from sky light color to sunlight color.

[0107] To verify the method of this embodiment, the LED light source module uses a combination of blue light sources: a blue LED with color coordinates (0.2270, 0.2921) and a color purity of 39.1%; white light 1: warm white light with a color temperature of 1800K and color coordinates (0.4610, 0.4110); and white light 2: cool white light with a color temperature of 6500K and color coordinates (0.3162, 0.3303). The changes in the color point of the simulated sky light to sunlight at noon are shown in the following table and... Figure 8 As shown, as the duty cycle of PWM1 gradually increases, the duty cycles of PWM2 and PWM3 decrease, and the sunlight color point gradually switches to the sky color point:

[0108]

[0109]

[0110]

[0111] In summary, the lighting method for simulating sunlight and sky in the above embodiments of the present invention can simulate the color of sunlight at different geographical locations, dates, and times, introduce simulated sunlight into the sky light, more closely resemble the changes in the actual sky, and use simulated sunlight to neutralize the blue of the simulated sky light, solving the problem that users may feel depressed after using the sky light for a long time; moreover, it can realize the change from the color of sky light to the color of sunlight, realize dynamic light change, add dimming and color adjustment functions to the lamp, and meet the user's special color needs.

[0112] Example 3

[0113] According to an embodiment of the present invention, a lighting device for simulating sunlight and sky is provided.

[0114] Figure 9 A block diagram of a lighting device for simulating sunlight and sky, according to an embodiment of the present invention, is shown. Figure 9 As shown, the device includes:

[0115] The calculation module 100 is configured to calculate the sky light color point at different sky element heights in a certain region and the PWM signal information required to control the corresponding LED light source module based on the atmospheric volume scattering coefficient and photoelectric parameter information of the LED light source module in different regions; and to calculate the solar light color point and photoelectric parameter information of the LED light source module based on the solar altitude angle, atmospheric optical quality, and extraterrestrial radiation spectrum, thereby obtaining the solar light color point at different times and the PWM signal information required to control the corresponding LED light source module.

[0116] LED driver module 200 is configured to output the PWM signal information in response to receiving a user instruction to control the LED light source module to reproduce the sky light color point and / or the sunlight color point.

[0117] In specific embodiments, such as Figure 10 As shown, the lighting device includes two light-emitting areas, one for simulating sunlight and the other for simulating skylight. The duty cycle of the blue light source in the skylight-simulating area satisfies...

[0118]

[0119] Where A is the distance from the color point of the sunlight region to the equal-energy white point, and B is the distance from the color point of the blue light source to the equal-energy white point. By controlling the corresponding light source module through the duty cycle, the color changes of sky light and sunlight are synchronously realized.

[0120] In specific embodiments, the LED light source module can employ either light source combination one or light source combination two. Light source combination one is as follows: Figure 11 As shown, it includes one high color temperature white light source, one low color temperature white light source, and one blue light source. The sunlight-emitting area and the sky-emitting area share one high color temperature white light source and one low color temperature white light source. The sky-emitting area also includes one blue light source. The light source combination is as follows... Figure 12 As shown, it includes one high color temperature white light source, one medium color temperature white light source, one low color temperature white light source, and one blue light source. The sunlight emitting area and the sky light emitting area are jointly provided with one high color temperature white light source, one medium color temperature white light source, and one low color temperature white light source. The sky light area is also provided with one blue light source.

[0121] In a specific embodiment, the LED driver module outputs four PWM signals. For example... Figure 13 As shown, the LED driver module is specifically... Figure 13The drive control module shown has a control unit connected to it to output drive control signals. The control unit is also connected to a CV control circuit to output CV control signals. The CV control circuit is also connected to two CC control circuits. An auxiliary power supply circuit is connected to the drive control module to supply power. The drive control module is connected to two CC control circuits and a complementary control circuit. One CC control circuit and the complementary control circuit are connected to three white light sources with different color temperatures from the LED light source module. The other CC control circuit is directly connected to one blue light source from the LED light source module. The drive control module outputs PWM dimming signals W, M, C, and BLUE to the complementary control circuit to control the three white light sources with different color temperatures and one blue light source from the LED light source module, respectively.

[0122] In a specific embodiment, the calculated duty cycle is output to the LED driver module to control the LED light source module to simulate sunlight at different times, and at the same time, it can simulate the affected sky light color.

[0123] To verify the method of this embodiment, the light source combination of the LED light source module is set to use...

[0124] Blue light source: Blue LED with color coordinates (0.2270, 0.2921) and a color purity of 39.1%.

[0125] White Light 1: Warm white light with a color temperature of 2700K, color coordinates (0.4611, 0.4213) and

[0126] White Light 2: Cool white light with a color temperature of 6500K and color coordinates (0.3170, 0.3371). The color point distribution in the sunlight and skylight areas is as follows. Figure 14 As shown.

[0127] In summary, the lighting device for simulating sunlight and sky in the above embodiments of the present invention can realize the synchronous change of sky light color and sunlight color, realize the simulation of sunlight at different times, and simulate the affected sky light color, thereby achieving the effect of introducing natural light into the room.

[0128] The specific embodiments of this application have been described above, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0129] In the description of this application, it should be understood that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that combinations of these measures cannot be used for improvement. Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. A lighting method for simulating sunlight and sky, characterized in that, include: S1: Based on the volumetric scattering coefficient of the atmosphere in different regions and the photoelectric parameter information of the LED light source module, calculate the sky light color points at different sky element altitudes in a certain region and the PWM signal information required to control the corresponding LED light source module; the calculation method for the sky light color points at different sky element altitudes is as follows: use the extraterrestrial spectrum P0 to calculate the spectrum P1 after scattering by the atmosphere, and the spectrum P1 after atmospheric scattering is calculated using the following formula: Among them, a mλ λ is the volumetric scattering coefficient of the atmosphere in the corresponding region, where λ is the wavelength of light, N is the standard atmospheric density, and n is the refractive index of air. The tristimulus values ​​X, Y, Z of skylight and the color coordinates x, y are calculated using the following formulas: Calculate the relationship between different sky element heights A and the color purity α of sky light, using the formula α = f(A); Calculate the relationship between the sky color coordinates x at the zenith and the color purity α: x = g(α); Calculate the relationship between the sky color coordinates y at the zenith and the color purity α, using the formula y = h(α); Based on the relationship between different sky element heights A and the color purity α of sky light, the relationship between the color coordinates x of sky light at the zenith and the color purity α, and the relationship between the color coordinates y of sky light at the zenith and the color purity α, the sky light color points at different sky element heights are calculated. S2: Based on the solar elevation angle, atmospheric optical quality, and extraterrestrial radiation spectrum, the solar color point and photoelectric parameter information of the LED light source module are obtained. The solar color point at different times and the PWM signal information required to control the corresponding LED light source module are calculated. The calculation method for the solar color point at different times is as follows: calculate the Earth's extraterrestrial radiation spectrum after scattering and absorption at different altitude angles, i.e., the Earth's surface spectrum; use the Earth's surface spectrum to calculate the solar color point; construct the relationship of the change of the solar color point at different solar altitude angles; convert the solar altitude angle into time to obtain the solar color point at different times; and the light source combination in the LED light source module includes two white light sources with different color temperatures and one blue light source with a main wavelength of 480±7nm and a color purity of 40%±5%; or three white light sources with different color temperatures and one blue light source with a main wavelength of 480±7nm and a color purity of 40%±5%. Calculate the color temperature of sunlight at different times; calculate the duty cycles η1, η2, and η3 required to mix two / three white light sources to achieve the corresponding color temperature; linearly vary the duty cycles of the blue light and the mixed light source according to k1 + k2(η1, η2, η3) = 1, where k1 is the duty cycle of the blue light source, k2 is the duty cycle of the mixed light source after mixing two / three white light sources, and the scaling factor corresponds to the duty cycle of the two / three white light sources; output the calculated duty cycles to the LED driver module; S3: In response to receiving a user instruction, the LED driver module outputs the PWM signal information to control the LED light source module to reproduce the sky light color point and / or the sunlight color point, as well as the uniform switching of the sky light color point to the sunlight color point at different times; wherein, the LED driver module can output at least three PWM signals, two of which control the white light mixing intermediate color temperature, and the other controls the blue light source.

2. The illumination method for simulating sunlight and sky according to claim 1, characterized in that, The LED driver module can output two PWM signals.

3. The illumination method for simulating sunlight and sky according to claim 2, characterized in that, The light source combination in the LED light source module includes: A combination of two blue light sources, wherein the color purity of the blue light sources is between 10% and 45%, and the dominant wavelength is between 480 ± 7 nm; or A combination of a blue light source and a white light source with color coordinates within a 7-step color tolerance range of (0.3333, 0.3333). The blue light source has a color purity range of 40% ± 5% and a dominant wavelength range of 480 ± 7 nm. The 7-step color tolerance range is within the range of a 7-step McAdam ellipse or a 7-step square.

4. A lighting device for simulating sunlight and sky, characterized in that, include The calculation module is configured to calculate the sky color points at different sky element heights in a given region, based on the atmospheric volume scattering coefficient and photoelectric parameter information of the LED light source module in different regions, as well as the PWM signal information required to control the corresponding LED light source module. The calculation method for the sky color points at different sky element heights is as follows: the spectrum P1 after atmospheric scattering is calculated using the extraterrestrial spectrum P0. The spectrum P1 after atmospheric scattering is calculated using the following formula: Among them, a mλ λ is the volumetric scattering coefficient of the atmosphere in the corresponding region, where λ is the wavelength of light, N is the standard atmospheric density, and n is the refractive index of air. The tristimulus values ​​X, Y, Z of skylight and the color coordinates x, y are calculated using the following formulas: Calculate the relationship between different sky element heights A and the color purity α of sky light, using the formula α = f(A); Calculate the relationship between the sky color coordinates x at the zenith and the color purity α: x = g(α); Calculate the relationship between the sky color coordinates y at the zenith and the color purity α, using the formula y = h(α); Based on the relationship between different sky element heights A and the color purity α of sky light, the relationship between the color coordinates x of sky light at the zenith and the color purity α, and the relationship between the color coordinates y of sky light at the zenith and the color purity α, the sky light color points at different sky element heights are calculated. Based on solar elevation angle, atmospheric optical quality, and extraterrestrial radiation spectrum, the solar color point and photoelectric parameters of the LED light source module are calculated. The solar color point at different times is obtained, along with the PWM signal information required to control the corresponding LED light source module. The calculation method for the solar color point at different times is as follows: The extraterrestrial radiation spectrum after scattering and absorption (i.e., the surface spectrum) is calculated at different elevation angles. The solar color point is then calculated using the surface spectrum, constructing the relationship between the solar color point changes at different solar elevation angles. The solar elevation angle is converted into time to obtain the solar color point at different times. Furthermore, the light source combination in the LED light source module includes two white light sources with different color temperatures and one blue light source with a main wavelength of 480±7nm and a color purity of 40%±5%; or three white light sources with different color temperatures and one blue light source with a main wavelength of 480±7nm and a color purity of 40%±5%. Calculate the color temperature of sunlight at different times; calculate the duty cycles η1, η2, and η3 required to mix two / three white light sources to achieve the corresponding color temperature; linearly vary the duty cycles of the blue light and the mixed light source according to k1 + k2(η1, η2, η3) = 1, where k1 is the duty cycle of the blue light source, k2 is the duty cycle of the mixed light source after mixing two / three white light sources, and the scaling factor corresponds to the duty cycle of the two / three white light sources; output the calculated duty cycles to the LED driver module; The LED driver module is configured to respond to a user command by outputting the PWM signal information to control the LED light source module to reproduce the sky light color point and / or the sunlight color point, as well as the uniform switching of the sky light color point to the sunlight color point at different times; wherein, the LED driver module can output at least three PWM signals, two of which control the white light mixing intermediate color temperature, and the other controls the blue light source.

5. The lighting device for simulating sunlight and sky according to claim 4, characterized in that, The lighting device includes two light-emitting areas, one for simulating sunlight and the other for simulating skylight. The duty cycle of the blue light source in the skylight-simulating area satisfies [the specified conditions]. ， Where A1 is the distance from the color point of the sunlight region to the white point of equal energy, and B is the distance from the color point of the blue light source to the white point of equal energy.

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