A lighting device and method based on uniformity of illumination intensity

Abstract

The invention relates to a lighting device and method based on uniformity of lighting intensity, the lighting device comprising a first light emitting member for generating light of a first wavelength, a second light emitting member for generating light of a second wavelength, and a third light emitting member for generating light of a third wavelength, each of a number of light emitting groups comprising a number of first light emitting members and at least one third light emitting member, the number of first light emitting members being arranged in a number of concentric groups positioned at different radial distances from the third light emitting member; the lighting method comprising the steps of: providing light of the first wavelength and light of the second wavelength; combining the light of the first wavelength and the light of the second wavelength to provide photosynthetically active radiation of a first predetermined light quality to illuminate a plant; and adjusting the light of the first wavelength such that, with a change in the light of the first wavelength, the photosynthetically active radiation is adjusted to a second predetermined light quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lighting technology, in particular to a lighting device and method based on lighting intensity uniformity. BACKGROUND

[0002] Light is an important environmental factor for plant growth and development, and suitable light environment is a prerequisite for high-yield and high-quality production. With the progress of science and technology and the continuous development of agricultural biotechnology, artificial light sources have emerged, which can supplement or completely replace natural light sources, make up for the weakness of weak light or insufficient sunlight in facilities agriculture in winter or cloudy days, and ensure normal photosynthesis of crops to achieve high-yield and high-efficiency production of facility crops. A large number of studies have shown that changes in light environment have a significant regulatory effect on the growth and development of trees, flowers, vegetables, algae and other plants. With the expansion and in-depth of basic research and the continuous popularization of agricultural technology application, the application of light environment regulation and lighting technology in facility cultivation is expanding and showing a good development prospect. The traditional artificial light sources used in facility agriculture mainly include incandescent lamps, biological effect lamps and the like, however, these artificial light sources have high energy consumption and high operating cost.

[0003] With the progress of industrial technology, LED, known as a new type of lighting source in the 21st century, has been successfully developed. Compared with traditional artificial light sources, LED has the advantages of low power voltage, high energy conversion efficiency, low heat output, fast response time, small size, environmental protection, long service life, adjustable light quality and intensity, easy to control and the like. Based on these advantages, LED has been successfully applied in horticultural crop lighting, such as controlled environment basic research, plant tissue culture, plant factory cultivation, facility agriculture light supplement and space ecological system. In addition, the successful development of LED panel light source system can realize accurate regulation of light intensity, light quality and light period of artificial light source, which not only provides convenience for basic theoretical research, but also can change according to the different growth periods and growth states of plants. As a new method, light regulation technology has outstanding advantages in facility agriculture regulation, which is simple, easy to operate, economical and effective, and energy-saving and environmentally friendly.

[0004] The prior art such as the patent document with publication number CN113958901A proposes a LED plant lamp device with high light quality ratio and light intensity uniformity, which comprises a frame body, the bottom of the frame body is provided with a plant planting pot mechanism, the frame body comprises two columns, the upper ends of the two side columns are respectively fixedly connected with a second fixed rod and a first fixed rod, and a mounting plate is fixedly connected between the two side second fixed rods, the two side first fixed rods and the two side columns. The LED lamp bead structure design and layout of the invention are the most suitable light source space structure for plant growth, which can realize light quality symmetry in the horizontal axis direction, effectively improve the light uniformity in the vertical axis, the LED lamp structure adopts secondary optical design, which can minimize light loss and improve light utilization rate. The LED light source layout designed by the invention adopts a non-equidistant spacing mode, the distances between each lamp bead are different, which can effectively improve the light intensity uniformity of the light source in space.

[0005] The horticultural lighting device for illuminating plants as proposed in the patent document with publication number CN106714547B comprises a lighting module having a plurality of lighting elements. The lighting module is limited to operate in a plurality of discrete modes that emit light having different discrete spectral compositions by emitting light from the lighting elements in different predetermined combinations. The modes include a growth mode configured with a spectrum that promotes plant growth and at least one manipulation mode configured with a spectrum that manipulates another biological process of the plant, wherein at least one of the lighting elements is arranged to emit in both the growth mode and the manipulation mode. The device further comprises a controller arranged to switch the lighting module between the plurality of discrete modes.

[0006] The technical solution proposed in the above patent designs for the uniformity of light and light quality, which to some extent guarantees the effect of the light, but in the actual use process, the illumination time of the lighting device is long, and the temperature of the lighting device rises, which will interfere with the light emitting effect of the LED lamp, and further affect the uniformity of the light. Therefore, it is necessary to design the lamp bead arrangement in combination with heat dissipation to improve the stability of the lighting device and further improve the uniformity of the light. And in the process of plant growth, the leaf area will grow continuously, so the same light is used in different periods of plant growth, which will inevitably cause energy waste. The light intensity is not enough to accurately evaluate the light amount of the leaf, so it is necessary to adjust the light device according to the growth form of the plant.

[0007] In addition, on the one hand, due to the difference in understanding of those skilled in the art; on the other hand, because the inventors have studied a large number of literatures and patents when making the invention, but due to the limitation of space, all details and contents are not listed in detail, but this does not mean that the invention does not have these prior art characteristics, on the contrary, the invention has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0008] The application discloses a lighting device based on lighting intensity uniformity, comprising: a first light emitting element for generating light of a first wavelength, a second light emitting element for generating light of a second wavelength, and a third light emitting element for generating light of a third wavelength, and the first light emitting element, the second light emitting element and the third light emitting element are configured to form a plurality of light emitting groups, each of the plurality of light emitting groups comprises a plurality of first light emitting elements and at least one third light emitting element, and the plurality of first light emitting elements are arranged in a plurality of concentric groups located at different radial distances from the third light emitting element.

[0009] According to a preferred embodiment, each of the plurality of light emitting groups comprises at least one second light emitting element, and the second light emitting element corresponds to the plurality of first light emitting elements at the same radial distance to form a group.

[0010] According to a preferred embodiment, the first light emitting group has at least one second light emitting element in a first direction, and the second light emitting group has at least one second light emitting element in a second direction corresponding to the first direction, so that the second light emitting element is configured in a plurality of directions relative to the third light emitting element.

[0011] In the application, the plant coverage is the range of leaf coverage, which gradually increases during plant growth, and is a variable related to time and a variable related to the ratio of leaf area to leaf gap area (leaf gap ratio).

[0012] In the application, the half-angle value of red light refers to the illuminance value of the irradiation surface formed by the light cone within the opening angle range of the light cone with the red light emitting element (first light emitting element) as the vertex. The half-angle value of blue light refers to the illuminance value of the irradiation surface formed by the light cone within the opening angle range of the light cone with the blue light emitting element (second light emitting element) as the vertex. The illuminance values are variables related to time, plant coverage and leaf gap ratio.

[0013] In the application, the difference between the half-angle values of red light and blue light refers to the difference between the red and blue light irradiation surface areas that meet the required illuminance value of the plant based on the same irradiation distance.

[0014] The lighting device in the prior art mainly adopts the form of top surface light source to irradiate plants, and the red light emitting part and the blue light emitting part are usually designed in the form of equal interval and interval arrangement. The lighting device manufactured by the above arrangement improves the uniformity on the whole irradiation surface, but the leaf coverage range of the plants corresponding to the lighting device is not the whole plane (plant coverage surface), and there is a part of the leaf coverage area (first gap), and the culture pit has a certain interval, which further increases the area of the uncovered leaf (second gap), thereby causing the light irradiated to the part between the plants to be projected on the gap of the uncovered leaf of the adjacent plant, causing a large amount of energy waste. Due to the difference in half angle value of the red light emitting part and the blue light emitting part, the lighting device in the prior art arranged in the same height and the same interval will usually cause the blue light coverage range (blue light coverage range with uniform illumination intensity) to be smaller than the red light coverage range, further limiting the uniform irradiation area of the light source. The arrangement of the light source in the prior art further increases the heat of the central region of the lighting device, and the heat dissipation effect of the heat dissipation mechanism in the prior art is relatively uniform, so that the light source in the central part has a higher junction temperature compared with the light source at the edge, the light emitting efficiency of the light source is affected, and the light irradiation uniformity of the lighting device is further affected. In view of the above problems, the arrangement structure of the light emitting part is designed, the third light emitting part is taken as the distribution center, the first light emitting part and the second light emitting part are arranged around the third light emitting part to form a light emitting group, and a plurality of light emitting groups are arranged periodically (the light emitting group corresponds to the culture pit).

[0015] Specifically, in the process of plant growth, the red light and blue light ratio generally needs to be greater than 2 to meet the growth needs of plants, so in the process of integrating the light emitting part to form the lighting device, the first light emitting part for generating red light has more quantity compared with the second light emitting part for generating blue light, so the overall energy consumption of the first light emitting part for generating red light is greater than that of the second light emitting part, so it is necessary to ensure the same illumination intensity distribution uniformity under the condition of half angle value difference during the arrangement of the first light emitting part and the second light emitting part, and to reduce the energy consumption as much as possible, so the third light emitting part is taken as the arrangement center to arrange the first light emitting part, so that the first light emitting part of the lighting device forms a uniform red light irradiation surface with a plurality of uniform irradiation centers on the whole irradiation surface. The above irradiation center corresponds to the culture pit, compared with the prior art, the red light in the area of the culture pit is uniform and has high illumination intensity, the red light in the second gap between the plants is not uniform and has reduced illumination intensity, and the energy utilization efficiency is improved.

[0016] Further, to ensure that the illumination surface formed by the second light-emitting component for generating blue light has a more uniform light distribution, and to reduce the manufacturing difficulty caused by the arrangement, at least one second light-emitting component is arranged in the group of first light-emitting components surrounding the third light-emitting component during the above-mentioned arrangement of the first light-emitting component. The number and distribution position of the second light-emitting component in each light-emitting group can be adjusted to make the overall arranged second light-emitting component have different distribution parameters. Since the power of the blue light-emitting component is less than that of the red light-emitting component, the temperature distribution of the lighting device is further optimized, and in combination with the third light-emitting component located in the center, the temperature distribution of the overall lighting device is more uniform, avoiding the phenomenon that the local temperature is too high to affect the light-emitting performance of the lighting device.

[0017] Specifically, the second light-emitting component is arranged around the third light-emitting component in several positions centered on the third light-emitting component. The second light-emitting components of adjacent light-emitting groups are uniformly arranged with the center of the plurality of light-emitting groups as the center of symmetry, so that the illumination surface formed by the blue light-emitting component of the lighting device satisfies the reduction of energy consumption (reduced by the first light-emitting component) and makes the distribution structure of the second light-emitting component more reasonable. The distance between adjacent second light-emitting components is larger than the distance between adjacent second light-emitting components, so that the illumination of the blue light illumination surface generated by the lighting device is more uniform under the condition of satisfying the red light uniformity, and the number of second light-emitting components is smaller. The energy waste caused by blue light in the gap part of the plant is negligible.

[0018] In the prior art, red and blue light combination is usually used for plant light supplement. Due to the single light quality of the light source, the content of some nutrients is reduced to a certain extent, which affects the development of plants and the quality of agricultural products. To solve the above problems, a third light-emitting component (a near-ultraviolet chip as an excitation light source to excite fluorescent powder to emit light can realize wide spectral coverage from near-ultraviolet to near-infrared) is introduced into the lighting device, and it is located in the distribution center and corresponds to the culture pit. The illumination time is short, so in the process of use, it can effectively act as a heat dissipation center to improve the temperature distribution of the lighting device. Based on the same heat dissipation mechanism, the heat distribution is more uniform, and the local temperature is not too high, so as to improve the light uniformity of the lighting device.

[0019] Further, different stages of plant growth, different plants have different needs for the ratio of red and blue light, in order to have better lighting effect for plants, and without changing the structure of the lighting device, adjusting the number and / or power of the first light emitting members in the working state can realize multiple red and blue light ratio illumination modes, and the group arrangement mode of the present application enables the first light emitting members to have multiple symmetrical combinations, so that the adjusted light distribution is more uniform, and the uniformity and illumination intensity decrease caused by the edge of the light emitting group mainly affects the second gap between plants, without affecting the plants.

[0020] The above is achieved by designing the position arrangement mode of the light emitting members of the multiple light emitting groups integrated by the first light emitting members and the second light emitting members of the lighting device, optimizing the heat dissipation performance and saving energy, and enabling the blue light and the red light of the lighting device to have more uniform illumination surfaces corresponding to the cultivation pits and meet the illumination requirements of the plants, but considering that only studying the illumination is not enough to accurately evaluate the leaf light amount, the present application creatively proposes to take the inter-leaf space ratio as a consideration parameter during plant growth, and adjusts the distribution mode of the lighting device according to the distribution characteristics of different forms of leaves (adjusts the distribution position of the blue light emitting members of the light emitting group of the lighting device based on rotation), and based on the light emitting member arrangement mode of the present application, the illumination surface can correspond to the leaf form of the plant.

[0021] According to a preferred embodiment, the second light emitting members of the light emitting group form a second illumination surface, and the first light emitting members of the light emitting group form a plurality of first illumination surfaces in the corresponding second illumination surface.

[0022] According to a preferred embodiment, the first light emitting members controlled by the external circuit can adjust the illumination parameters of at least one first illumination surface of the lighting device, and the illumination parameters of the first illumination surface are reduced or increased relative to the illumination parameters of the second illumination surface to adjust the illumination parameters of the lighting device including at least light quality.

[0023] According to a preferred embodiment, the second light emitting members and the third light emitting members arranged periodically or non-periodically along the length direction and / or the width direction of the heat dissipation mechanism can be matched to the group setting to optimize the temperature distribution of the lighting device.

[0024] The present application discloses a lighting method based on lighting intensity uniformity, which comprises the following steps: providing light of a first wavelength and light of a second wavelength; combining the light of the first wavelength and the light of the second wavelength to provide photosynthetically active radiation of a first preset light quality to illuminate plants; and adjusting the light of the first wavelength, so that the photosynthetically active radiation is adjusted to a second preset light quality as the light of the first wavelength changes.

[0025] According to a preferred embodiment, the lighting method further comprises the steps of: providing light rays of a third wavelength; combining the light rays of the first wavelength, the light rays of the second wavelength and the light rays of the third wavelength to provide the photosynthetically active radiation of a third preset light quality to irradiate the plant, the light rays of the third wavelength having a spectral range from near ultraviolet to near infrared.

[0026] According to a preferred embodiment, the lighting method further comprises the steps of: the light rays of the first wavelength form a first irradiation plane, the light rays of the second wavelength form a second irradiation plane, and the first irradiation plane and the second irradiation plane are located in the same plane; reducing or increasing the irradiation parameters of the first irradiation plane relative to the irradiation parameters of the second irradiation plane to adjust the irradiation parameters including at least the light quality.

[0027] According to a preferred embodiment, the forming process of the first irradiation plane comprises the steps of: a plurality of first light emitting pieces are arranged in a plurality of concentric groups positioned at different radial distances from the third light emitting piece, each group is formed by positioning a plurality of first light emitting pieces at a predetermined interval from each other along the circumference of the group, and the groups are positioned at a predetermined interval from each other.

[0028] According to a preferred embodiment, the forming process of the second irradiation plane comprises the steps of: each light emitting group comprises at least one second light emitting piece, and the second light emitting pieces correspond to a plurality of first light emitting pieces at the same radial distance to form a group, the second light emitting pieces of different light emitting groups of the group having the first light emitting pieces and the second light emitting pieces are offset from each other relative to the central axis where the third light emitting piece is located, the first light emitting group has at least one second light emitting piece in a first direction, and the second light emitting group has at least one second light emitting piece in a second direction corresponding to the first direction, so that the second light emitting pieces are configured in a plurality of directions relative to the third light emitting piece. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a simplified overall structure schematic diagram of the lighting device of the present application;

[0030] Figure 2 is a simplified overall distribution structure schematic diagram of the light emitting pieces of the lighting device of the present application;

[0031] Figure 3 is a schematic diagram of the light irradiation of the light emitting pieces of the lighting device of the present application to the culture pit;

[0032] Figure 4 is a simplified overall distribution structure schematic diagram of the light emitting groups of the lighting device of the present application;

[0033] Figure 5 is a simplified flowchart schematic diagram of the lighting method of the present application.

[0034] LIST OF REFERENCE NUMBERS

[0035] 1: heat dissipation mechanism; 2: culture plate; 11: first light emitting member; 12: second light emitting member; 13: third light emitting member; 21: culture pit; 100: first light emitting group; 200: second light emitting group; 300: third light emitting group; 400: fourth light emitting group; 500: first irradiation surface; 600: second irradiation surface. DETAILED DESCRIPTION

[0036] The present application will be described in detail below with reference to the accompanying drawings.

[0037] As shown in Figure 1 and Figure 2 The present application discloses a lighting device based on lighting intensity uniformity, comprising: a first light emitting member 11 for generating light of a first wavelength, a second light emitting member 12 for generating light of a second wavelength, and a third light emitting member 13 for generating light of a third wavelength, and the first light emitting member 11, the second light emitting member 12, and the third light emitting member 13 are configured to form a plurality of light emitting groups 100, 200, 300, 400, each of the plurality of light emitting groups 100, 200, 300, 400 includes a plurality of first light emitting members 11 and at least one third light emitting member 13, and the plurality of first light emitting members 11 are arranged in a plurality of concentric groups positioned at different radial distances from the third light emitting member 13.

[0038] According to a preferred embodiment, each of the plurality of light emitting groups 100, 200, 300, 400 includes at least one second light emitting member 12, and the second light emitting member 12 corresponds to the plurality of first light emitting members 11 at the same radial distance to form a group.

[0039] According to a preferred embodiment, the first light emitting group 100 has at least one second light emitting member 12 in a first direction, and the second light emitting group 200 has at least one second light emitting member 12 in a second direction corresponding to the first direction, so that the second light emitting member 12 is configured in a plurality of directions relative to the third light emitting member 13.

[0040] According to a preferred embodiment, the second light emitting member 12 of the light emitting group 100, 200, 300, 400 forms a second irradiation surface 600, and the plurality of first light emitting members 12 of the light emitting group 100, 200, 300, 400 form a plurality of first irradiation surfaces 500 in the corresponding second irradiation surface 600.

[0041] The prior art usually uses a red-blue light combination to supplement light for plants. Due to the single light quality of the light source, the content of some nutrients is reduced to a certain extent, which affects the development of plants and the quality of agricultural products. In view of the above problems, a third light emitting part (a near-ultraviolet chip as an excitation light source to excite fluorescent powder to emit light can realize wide spectral coverage from near-ultraviolet to near-infrared) is introduced into the lighting device, and it corresponds to the culture pit at the distribution center. The light irradiation time is short, so in the process of use, it can effectively act as a heat dissipation center to improve the temperature distribution of the lighting device. Based on the same heat dissipation mechanism setting, the heat distribution is more uniform, and local temperature is not too high, thereby improving the light uniformity of the lighting device.

[0042] As Figure 3 The light cone formed by the light cone in the opening and closing angle range of the light cone with the first light emitting part 11 as the vertex has an area difference with the light cone formed by the light cone in the opening and closing angle range of the light cone with the second light emitting part 12 as the vertex in the process of the light emitting part of the lighting device of the application irradiating to the culture pit 21 of the culture plate 2.

[0043] As Figure 4 The arrangement structure of the light emitting group of the preferred lighting device of the application, the structure of the light emitting group is relatively similar, part of the first light emitting part 11 in the group is replaced by the second light emitting part 12, and the second light emitting part 12 of different light emitting groups is distributed at different positions relative to the third light emitting part 13, which can meet the uniform arrangement of the second light emitting part 12, and the second light emitting part 12 of different light emitting groups can form an arrangement combination with multiple arrangement spacings to optimize its irradiation surface (such as irradiation area, etc.). In the above arrangement process, no light emitting part is arranged between the light emitting groups, and the central position of the single light emitting group is arranged with the third light emitting part 13 which is in a non-working state in most cases, so that the above setting mode makes the lighting device form multiple heat dissipation centers during the working process of the lighting device, thereby optimizing the heat dissipation of the lighting device, avoiding local temperature being too high, causing junction temperature difference affecting the lighting effect of the light emitting part.

[0044] According to a preferred embodiment, the second light emitting part 12 and the third light emitting part 13 arranged periodically or non-periodically along the length direction and / or the width direction of the heat dissipation mechanism 1 can be matched to the group setting to optimize the temperature distribution of the lighting device.

[0045] Specifically, when the light emitting pieces are densely arranged, a heat center is formed on an integrated plate of the lighting device, which affects the light emitting performance of the light emitting pieces located at the heat center. In the present application, the density of the light emitting pieces between the light emitting groups is low, and a low temperature zone is formed at the gap between the light emitting groups, which avoids heat accumulation. In each light emitting group, the third light emitting piece located at the central position is in a non-working state, which further reduces the heat of the central region to optimize the temperature distribution of the lighting device in the form of multiple low temperature zones.

[0046] Further, the light emitting pieces need to be integrated to form a surface light source. The second light emitting pieces 12 in the present application are distributed at different positions in the light emitting group, which does not affect the uniformity of the distribution of the second light emitting pieces 12 under the condition of reducing the manufacturing difficulty, and the light emitting groups can be combined so that the first light emitting pieces and the second light emitting pieces of the lighting device can have a uniform illumination surface.

[0047] Different plants have different requirements for the ratio of red and blue light at different stages of plant growth. After meeting the requirement of optimizing the temperature distribution, the arrangement of the present application can adjust the first illumination surface formed by the first light emitting pieces to correspond to the growth form of the plant, so that the plant has a better light effect. In addition, without changing the structure of the lighting device, adjusting the number of first light emitting pieces in the working state can realize multiple red and blue light ratio illumination modes, and the uniformity and illumination intensity decrease caused by the edge of the light emitting group mainly affects the gap between the plants, which does not affect the plants.

[0048] Specifically, the groups formed by the first light emitting pieces 11 are distributed around the distribution center of the third light emitting pieces 13. Several first light emitting pieces in the same group can form multiple light emitting groups with the same illumination effect, which further enables the lighting device to have a larger adjustment range (the ratio of red and blue light and the area of the corresponding illumination surface), and also ensures the uniformity of the light.

[0049] According to a preferred embodiment, the first light emitting pieces 11 controlled by the external circuit can adjust the illumination parameters of at least one first illumination surface 500 of the lighting device, and the illumination parameters of the first illumination surface 500 are reduced or increased relative to the illumination parameters of the second illumination surface 600 to adjust the illumination parameters of the lighting device, including the light quality.

[0050] Specifically, the working state of the first light emitting member is adjusted so that the first light emitting member in the light emitting group can have multiple distribution densities, and the distribution mode of the concentric group is such that the distribution structure of the first light emitting member is relatively uniform and can also have multiple light emitting modes with the same light emitting effect, so that the first irradiation surface 500 formed by the light emitting group has multiple areas to correspond to different second gaps. The intensity and uniformity of the irradiation area formed by the light emitting group outside the first irradiation surface 500 are poor, but since it is in the second gap between plants, it will not affect plant growth.

[0051] The above is achieved by designing the arrangement of the light emitting members of the multiple light emitting groups integrated with the first light emitting member and the second light emitting member of the lighting device. The lighting device has optimized heat dissipation performance and energy saving, and the blue light and red light of the lighting device have more uniform irradiation surfaces corresponding to the cultivation pits and meet the plant illumination requirements. However, considering that only studying illumination is not enough to accurately evaluate the amount of light received by the leaves, the present application creatively proposes to use the inter-leaf space ratio as a parameter for consideration during plant growth, and adjusts the distribution mode of the lighting device according to the distribution characteristics of leaves of different shapes (adjusts the distribution position of the blue light emitting members of the light emitting group of the lighting device based on rotation). Based on the arrangement of the lamp beads of the present application, the light irradiation surface can correspond to the shape of the plant leaves.

[0052] Specifically, during the different growth processes of the plants cultured in the cultivation plate, the plants between different cultivation pits 21 have a second gap, and the plant leaves do not cover all the light irradiation surface to form a first gap. Therefore, during this process, the arrangement of the lighting device needs to be designed according to the above gap distribution. The arrangement of the first light emitting member and the second light emitting member in the above process ensures that the light irradiation is as little as possible to the second gap position, and multiple groups can adjust the irradiation parameters (including at least the light intensity and the irradiation area) of the first irradiation surface 500 and the second irradiation surface 600 according to the second gap.

[0053] Specifically, considering that only studying illumination is not enough to accurately evaluate the amount of light received by the leaves, the differences in the performance of the light emitting members, the impact of the second light emitting member 12 replacing the third light emitting member 13, and the impact of the gap between the light emitting members will further affect the light receiving of the plants. Therefore, the rotation of the light emitting group can further optimize the problem of plant light receiving difference caused by the above problems.

[0054] Specifically, the arrangement position of the second light-emitting component 12 will affect the uniform arrangement of the first light-emitting component 11 to a certain extent, and the inevitable parameter differences during the production process of the first light-emitting component 11 or when it is in operation will affect the uniformity of light. Therefore, in this process, the degree of light received by some blades is affected. Therefore, the arrangement method of the light-emitting components of the present invention facilitates its rotation to optimize the uniformity of light distribution in the area swept by the light-emitting components through rotation, so that the amount of light received by the blades is more uniform.

[0055] Furthermore, taking the growth process of tobacco leaves as an example, during the leaf growth process, when the second gap is relatively stable, the rotation speed of the light-emitting group needs to be adjusted according to the different leaf shapes (large leaf surface, medium leaf surface, small leaf surface, etc. have different areas; the differences caused by the leaf shapes of different plants, such as tobacco and Panax notoginseng), so as to further optimize the amount of light received by the leaves. In other words, as the leaf area gradually increases, the interleaf gap ratio continues to decrease, and the rotation speed of the light-emitting group needs to be further adjusted to ensure more uniform light reception for the plants.

[0056] Specifically, during the rotation of the light-emitting group, the illumination of the first irradiated surface formed by the first light-emitting component is more uniform. At the same time, the gap of the second light-emitting component will change, causing the corresponding amount of light received by the blade to change. When the interleaf space ratio is small, the brightness difference caused by the above difference is small, but as the interleaf space ratio increases, the blade coverage area becomes larger, and the difference in the amount of light received between the blades gradually increases. Therefore, it is necessary to adjust the rotation speed of the light-emitting group. As the interleaf space ratio continues to increase, the rotation speed of the light-emitting group is increased to make the amount of light received by the blade more uniform.

[0057] Optionally, for ease of control, the interleaf space ratio of the leaves is classified according to their growth morphology. When they are in a small leaf surface state or the leaf morphology conforms to the interleaf space ratio of the small leaf surface state, the light-emitting group rotates at a constant first speed. The subsequent medium leaf surface and large leaf surface states in the growth state also adjust the rotation speed of the light-emitting group based on the interleaf space ratio.

[0058] like Figure 5 The present invention discloses a lighting method based on lighting intensity uniformity, the lighting method comprising the following steps:

[0059] S1. Providing light of a first wavelength and light of a second wavelength; combining the light of the first wavelength and the light of the second wavelength to provide photosynthetically active radiation of a first preset light quality to illuminate plants, and adjusting the light of the first wavelength so that the photosynthetically active radiation is adjusted to the second preset light quality as the light of the first wavelength changes.

[0060] S2, providing light rays of a third wavelength; combining the light rays of the first wavelength, the light rays of the second wavelength and the light rays of the third wavelength to provide the photosynthetically active radiation of the third preset light quality to irradiate the plant, the light rays of the third wavelength having a spectral range of near ultraviolet to near infrared.

[0061] S3, the light rays of the first wavelength form a first irradiation surface 500, the light rays of the second wavelength form a second irradiation surface 600, and the first irradiation surface 500 and the second irradiation surface 600 are located in the same plane; the irradiation parameters of the first irradiation surface 500 are reduced or increased relative to the irradiation parameters of the second irradiation surface 600 to adjust the irradiation parameters including at least the light quality.

[0062] According to a preferred embodiment, the forming process of the first irradiation surface 500 includes the following steps: a plurality of first light emitting pieces 11 are arranged in a plurality of concentric groups located at different radial distances from the third light emitting piece 13, each group is formed by positioning a plurality of first light emitting pieces 11 at a predetermined interval from each other along the circumference of the group, and the groups are positioned at a predetermined interval from each other.

[0063] According to a preferred embodiment, the forming process of the second irradiation surface 600 includes the following steps: each light emitting group 100, 200, 300, 400 includes at least one second light emitting piece 12, and the second light emitting piece 12 corresponds to a plurality of first light emitting pieces 11 at the same radial distance to form a group, the second light emitting pieces 12 of different light emitting groups 100, 200, 300, 400 having groups of first light emitting pieces 11 and second light emitting pieces 12 are offset from each other relative to the central axis where the third light emitting piece 13 is located, the first light emitting group 100 has at least one second light emitting piece 12 in a first direction, and the second light emitting group 200 has at least one second light emitting piece 12 in a second direction corresponding to the first direction, so that the second light emitting pieces 12 are configured in a plurality of directions relative to the third light emitting piece 13.

[0064] Optionally, the wavelength of the second light emitting piece 12 is in the range of 400-480 nm corresponding to the blue light domain absorption region of chlorophyll, and the wavelength of the first light emitting piece 11 is in the range of 620-700 nm corresponding to the red light domain absorption region of chlorophyll.

[0065] Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily provided, so the applicant reserves the right to abandon or delete the relevant preferred features at any time.

[0066] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to devise modifications which, though perhaps not explicitly described or shown herein, nonetheless fall within the scope of the application. Accordingly, the patentable scope of the application is defined by the appended claims and their equivalents.

Claims

1. A lighting device based on uniformity of lighting intensity, comprising: a first light emitting element (11) for generating light of a first wavelength, a second light emitting element (12) for generating light of a second wavelength, and a third light emitting element (13) for generating light of a third wavelength, and the first light emitting element (11), the second light emitting element (12), and the third light emitting element (13) are configured to form a plurality of light emitting groups, the light emitting groups including a first light emitting group (100), a second light emitting group (200), a third light emitting group (300), and a fourth light emitting group (400), the plurality of light emitting groups constituting the lighting device, characterized in that each light emitting group includes a plurality of first light emitting elements (11) and at least one third light emitting element (13), the plurality of first light emitting elements (11) being arranged in a plurality of concentric groups located at different radial distances from a distribution center of the third light emitting element (13), and each light emitting group includes at least one second light emitting element (12), and the second light emitting element (12) and the plurality of first light emitting elements (11) at the same radial distance therefrom correspond to each other to form a group, the second light emitting elements (12) of adjacent light emitting groups being uniformly arranged about a center of the plurality of light emitting groups as a symmetrical center.

2. The lighting device of claim 1, characterized in that The first light emitting group (100) has at least one second light emitting element (12) in a first direction, and the second light emitting group (200) has at least one second light emitting element (12) in a second direction corresponding to the first direction, so that the second light emitting elements (12) are arranged in a plurality of directions relative to the third light emitting elements (13).

3. The lighting device according to claim 1 or 2, characterized in that The second light emitting elements (12) of each light emitting group form a second irradiation surface (600), and the plurality of first light emitting elements (11) of each light emitting group form a plurality of first irradiation surfaces (500) in the corresponding second irradiation surface (600).

4. The lighting device of claim 3, characterized in that The first light emitting elements (11) controlled by an external circuit can adjust the irradiation parameters of at least one first irradiation surface (500) of the lighting device, and the irradiation parameters of the first irradiation surface (500) are reduced or increased relative to the irradiation parameters of the second irradiation surface (600) to adjust the irradiation parameters of the lighting device, including light quality.

5. The illumination device of claim 1, wherein, The second light emitting elements (12) and the third light emitting elements (13) arranged periodically or non-periodically along the length direction and / or the width direction of the heat dissipation mechanism (1) can be arranged in groups to optimize the temperature distribution of the lighting device.

6. A lighting method based on uniformity of lighting intensity using the lighting device according to any one of claims 1 to 5, characterized by, comprising the steps of: providing light of a first wavelength and light of a second wavelength; combining the light of the first wavelength and the light of the second wavelength to provide photosynthetically active radiation of a first preset light quality to irradiate a plant; and adjusting the light of the first wavelength, such that with a change in the light of the first wavelength, the photosynthetically active radiation is adjusted to a second preset light quality.

7. The illumination method of claim 6, wherein further comprising the steps of: providing light of a third wavelength; combining the light of the first wavelength, the light of the second wavelength, and the light of the third wavelength to provide photosynthetically active radiation of a third preset light quality to irradiate a plant, wherein the light of the third wavelength has a spectral range of a wide spectrum from near ultraviolet to near infrared.

8. The illumination method according to claim 6 or 7, characterized in that, further comprising the steps of: The light rays of the first wavelength form a first irradiation surface (500), the light rays of the second wavelength form a second irradiation surface (600), and the first irradiation surface (500) and the second irradiation surface (600) are located in the same plane; The irradiation parameters of the first irradiation surface (500) are reduced or increased relative to the irradiation parameters of the second irradiation surface (600) to adjust the irradiation parameters including at least the light quality.

9. The illumination method of claim 8, wherein, The forming process of the first irradiation surface (500) includes the following steps: The first light emitting pieces (11) are arranged in several concentric groups positioned at different radial distances from the third light emitting piece (13), Wherein each group is formed by positioning several first light emitting pieces (11) at a predetermined interval from each other along the circumference of the group, and the groups are positioned at a predetermined interval from each other.

10. The illumination method of claim 8, wherein, The forming process of the second irradiation surface (600) includes the following steps: Each light emitting group includes at least one second light emitting piece (12), and the second light emitting piece (12) corresponds to several first light emitting pieces (11) at the same radial distance therefrom to form a group, Wherein the second light emitting pieces (12) of different light emitting groups having the groups of first light emitting pieces (11) and second light emitting pieces (12) are offset from each other relative to the central axis of the third light emitting piece (13), Wherein the first light emitting group (100) has at least one second light emitting piece (12) in a first direction, and the second light emitting group (200) has at least one second light emitting piece (12) in a second direction corresponding to the first direction, so that the second light emitting pieces (12) are arranged in several directions relative to the third light emitting piece (13).

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