Lighting device and cultivation shelf using the lighting device

Abstract

Provided are: an illumination device which helps avoid waste in energy and only a few units of which enable illuminating the inside of a cultivation rack evenly and efficiently; and a cultivation rack using such an illumination device.　This illumination device 10 is provided with: a supporting member 11; substrates 12, 22; LED packages 13, 23; outer reflective boards 14, 24; inner reflective boards 15, 25; covers 17, 27; a power supply 18; and an electronic circuit 19. The LED package 13 is disposed such that a maximum light intensity direction M forms an angle θ1 from a second direction toward the R-side. The LED package 23 is disposed such that a maximum light intensity direction M forms an angle θ1 from the second direction toward the L-side. The outer reflective boards 14, 23 and the inner reflective boards 15, 25 reflect the light emitted from the LED packages 13, 23, respectively, and reflect light coming from the illuminated surface side.

Description

[Technical field]

[0001] The present invention relates to a lighting device, and more particularly to a lighting device used in a cultivation shelf for plants. The present invention also relates to a cultivation shelf using a lighting device. [Background technology]

[0002] It is already known to cultivate plants such as agricultural crops in cultivation factories and the like. In cultivation factories and the like, lighting devices such as artificial lighting are installed on cultivation shelves, and plants are cultivated in the cultivation space within the shelves. Specifically, a configuration is used in which a hydroponic cultivation equipment is provided in the lower part of the cultivation shelf, and a lighting device is installed in the upper part of the shelf so as to emit light toward the hydroponic cultivation equipment.

[0003] For example, Patent Document 1 discloses a multi-stage hydroponic cultivation device that has a movable lighting device that irradiates artificial light toward plants in a hydroponic cultivation panel and adjusts the distance between the plants to be cultivated and the lighting device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-36312 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the light emitted from the lighting device has the strongest intensity when emitted forward, and the intensity of the light emitted at an angle decreases (Lambertian light distribution). Therefore, in order to emit light uniformly in the cultivation shelf and obtain sufficient lighting intensity, it is necessary to increase the number of lighting devices installed and shorten the distance between the lighting devices.

[0006] However, increasing the number of lighting devices increases the cost of the lighting device itself and the installation costs such as construction costs. In addition, since the lighting devices may become dirty due to the cultivated plants and hydroponic liquid fertilizer, an increase in the number of lighting devices increases the frequency of inspection and cleaning, etc., and the effort and cost required for maintenance increases. Furthermore, an increase in the number of lighting devices increases the frequency of breakdowns. In particular, in large-scale cultivation factories, a large number of lighting devices are required in the first place, so the above problem is prominent.

[0007] In addition, although the lighting device emits a large amount of light in the front direction, it also emits light in oblique and lateral directions. Therefore, the light emitted in the lateral direction, in particular, illuminates the outside of the cultivation shelf, resulting in the consumption of unnecessary energy that does not contribute to cultivation.

[0008] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to achieve the objects described below. The present invention aims to solve the problems of the conventional technology described above, reduce energy waste, and provide a lighting device that can uniformly and efficiently illuminate a cultivation shelf with a small number of devices installed, and a cultivation shelf that uses said lighting device. [Means for solving the problem]

[0009] In order to achieve the above object, the lighting device of the present invention has two light-emitting members arranged at different positions in a first direction and emitting light toward an irradiated surface, a support member supporting the two light-emitting members with a central position in the first direction located between the two light-emitting members, two first light adjustment members arranged outward from the two light-emitting members in the first direction and each adjusting the direction of travel of light emitted from a corresponding one of the two light-emitting members, and two second light adjustment members arranged inward from the two light-emitting members in the first direction and adjusting the direction of travel of light coming from the irradiated surface side, each of the two light-emitting members being arranged such that the intensity of the light emitted in a direction away from the central position in the first direction is highest, and each of the two first light adjustment members is arranged at a position overlapping with a corresponding light-emitting member in the first direction.

[0010] According to the lighting device of the present invention configured as described above, a wide range is irradiated by two light emitting members arranged so that the intensity of the light directed away from the center position in the first direction is the highest, while the first light adjusting member and the second light adjusting member adjust the light that deviates from the irradiated surface toward the irradiated surface. As a result, by installing the lighting device of the present invention on a plant cultivation shelf, energy waste can be reduced and the interior of the cultivation shelf can be uniformly and efficiently irradiated with a small number of installations.

[0011] In the lighting device of the present invention, the portion of the first light adjusting member closest to the central position is located farther from the irradiated surface in the second direction than the corresponding light emitting member. With the above configuration, it is possible to further reduce wasted light leaking to the outside, thereby more efficiently reducing wasted energy and enabling uniform and efficient illumination inside the cultivation shelf with a smaller number of units installed.

[0012] In the lighting device of the present invention, the portion of the first light adjustment member farthest from the central position is located closer to the irradiated surface in the second direction than the corresponding light emitting member. With the above configuration, it is possible to further reduce wasted light leaking to the outside, thereby more efficiently reducing wasted energy and enabling uniform and efficient illumination inside the cultivation shelf with a smaller number of units installed.

[0013] In the lighting device of the present invention, the two light emitting members are attached to the substrate, and the second light adjusting member is disposed at a position covering a part of the substrate. With the above configuration, energy waste can be reduced more efficiently, and the cultivation shelf can be uniformly and efficiently illuminated with a smaller number of lamps. In addition, the amount of light coming from the irradiated surface side that hits the substrate can be reduced, preventing the substrate from becoming too hot and contributing to stable operation of the light-emitting component.

[0014] In the lighting device of the present invention, the first light adjusting member or the second light adjusting member is a reflecting plate. With the above configuration, it is possible to reflect light emitted from the light-emitting component or light coming from the irradiated surface side, thereby more efficiently reducing energy waste and enabling the interior of the cultivation shelf to be uniformly and efficiently illuminated with a small number of units installed.

[0015] In the lighting device of the present invention, the angle between the second direction and the direction in which the intensity of the emitted light is highest is 5 to 90 degrees. With the above configuration, it is possible to illuminate a more appropriate range, thereby more efficiently reducing energy waste and enabling uniform and efficient illumination inside the cultivation shelves with a smaller number of installations.

[0016] In order to achieve the above object, the cultivation shelf of the present invention uses any one of the above-mentioned lighting devices. With the above configuration, energy waste can be reduced and the inside of the cultivation shelf can be uniformly and efficiently irradiated with a small number of lamps. Effect of the Invention

[0017] According to the present invention, it is possible to reduce energy waste and to uniformly and efficiently irradiate the inside of a cultivation shelf with a small number of installations. [Brief description of the drawings]

[0018] [Figure 1] FIG. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3] FIG. 2 is a schematic diagram of an LED package. [Figure 4] 1 is a diagram showing the relationship between angle θ1 and distance D. FIG. [Diagram 5] 11 is a table showing the relationship between angle θ1 and distance D. [Figure 6] FIG. 1 is a diagram illustrating a light distribution principle in a simplified manner. [Figure 7] FIG. 2 is a diagram showing a modified example of the cross-sectional view taken along line AA in FIG. [Figure 8] FIG. 1 is a schematic diagram of a cultivation shelf using a lighting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, one embodiment of the present invention (the present embodiment) will be described in detail with reference to the attached drawings. However, the embodiment described below is a specific embodiment given to easily explain the present invention, but does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit of the present invention, and the present invention naturally includes its equivalents.

[0020] <About the lighting device 10> As shown in FIGS. 1 and 2, the lighting device 10 includes a support member 11, substrates 12 and 22, LED packages 13 and 23, outer reflectors 14 and 24, inner reflectors 15 and 25, covers 17 and 27, a power supply 18, and an electronic circuit 19.

[0021] In this embodiment, the LED packages 13 and 23 correspond to light emitting members, the outer reflectors 14 and 24 correspond to first light adjusting members, and the inner reflectors 15 and 25 correspond to second light adjusting members. 1 and 2 corresponds to the first direction, and the position indicated by line C (dashed line) corresponds to the central position C in the first direction. Furthermore, the direction indicated by arrow F in Fig. 2 corresponds to the front face F of the lighting device 10, a plane (not shown) on the front face F side of the lighting device 10 corresponds to the irradiated surface, and the normal direction of the irradiated surface (the direction indicated by the line connecting CF in Fig. 2) corresponds to a second direction perpendicular to the first direction.

[0022] The support member 11 is a frame for stably supporting the substrates 12, 22, the LED packages 13, 23, the outer reflectors 14, 24, the inner reflectors 15, 25, the covers 17, 27, and the like. Specifically, the support member 11 supports the above-mentioned members approximately symmetrically on the left and right, and supports the substrate 12, the LED package 13, the outer reflector 14, the inner reflector 15, and the cover 17 on the R side. Meanwhile, the support member 11 supports the substrate 22, the LED package 23, the outer reflector 24, the inner reflector 25, and the cover 27 on the L side. In this embodiment, in order to maintain the strength of the lighting device 10, a wall is provided at the center position C as a boundary between the R side and the L side. In addition, in order to stably fix the substrates 12 and 22, the outer reflectors 14 and 24, the inner reflectors 15 and 25, etc. to the support member 11, auxiliary members (not shown) may be provided as appropriate. The support member 11 also has an internal space 20 therein capable of housing a power source 18 and an electronic circuit 19 including a capacitor (not shown) and the like.

[0023] The substrates 12 and 22 are rectangular plate-like members extending in a direction (hereinafter referred to as the third direction) perpendicular to the first and second directions. On the surfaces (front F side surfaces) of the substrates 12 and 22, a plurality of LED packages 13 and 23 are arranged at predetermined intervals along the third direction to form an LED row. The substrates 12 and 22 are provided with two LEDs in total, one on the R side (substrate 12) and one on the L side (substrate 22) of the center position C of the support member 11, resulting in the formation of two LED rows.

[0024] As shown in FIG. 3, the LED packages 13 and 23 are mainly composed of an LED chip 31, a package substrate 32, a lamp house 33, a lead frame , a bonding wire 35, and a sealing resin .

[0025] Specifically, the LED chip 31 is a light-emitting diode chip, and serves as the light source of the LED packages 13 and 23. The LED chip 31 is mounted on a package substrate 32, which is a printed circuit board made of aluminum or other material, and is connected to a lead frame 34, which serves as an electrode, by a conductive bonding wire 35. The LED chip 31 is fixed in place by a sealing resin 36 made of silicone, epoxy resin, or the like, which is filled inside a lamp house 33.

[0026] When a certain voltage is applied to the LED packages 13 and 23 configured as described above, the LED chip 31 emits light and converts electricity into light. The LED packages 13 and 23 emit light radially (semicircularly) over a wide range, but generally, the intensity of the light emitted in the direction indicated by the arrow M in Fig. 3, i.e., in the direction directly facing the LED chip 31, is the highest, and the intensity of the light emitted in oblique directions is lower. In this embodiment, the direction in which the light intensity is highest is referred to as the strongest illuminance direction M.

[0027] In this embodiment, the LED packages 13 and 23 are arranged such that the strongest illuminance directions M of the LED packages 13 and 23 are oriented away from the central position C in the first direction (so-called outward direction). Specifically, the LED package 13 is arranged such that the strongest illuminance direction M is in a direction that has an angle θ1 from the second direction toward the R side. The LED package 23 is arranged such that the strongest illuminance direction M is in a direction that has an angle θ1 from the second direction toward the L side. Note that although the angle θ1 of the LED package 13 and the angle θ1 of the LED package 23 are the same angle in this embodiment, they may be different angles.

[0028] Here, a preferable range of the angle θ1 will be described with reference to FIGS. 4 and 5, when the angle θ1 is increased, the distance D also increases. That is, if the angle θ1 is too small, the range that can be irradiated is narrowed. On the other hand, if the angle θ1 is too large, a distant area is irradiated, nearby areas are darkened, and much of the light deviates from the irradiated surface 37. Therefore, the range of the angle θ1 is preferably 5 to 90 degrees, more preferably 10 to 80 degrees, even more preferably 20 to 70 degrees, and most preferably 30 to 60 degrees. In addition, distance D is the distance from the intersection D1 of LED package 13, 23 (more precisely, LED chip 31) with irradiated surface 37 in the second direction to the arrival point D2 of light emitted in the strongest illuminance direction M on irradiated surface 37, and indicates the ratio when the distance (height) between the position of LED package 13, 23 (more precisely, LED chip 31) in the second direction and intersection point D1 is set to 100%.

[0029] The outer reflectors 14 and 24 are members that adjust the traveling direction of light, and are plate-like members that extend in the third direction along the substrates 12 and 22 at a position outside (R side) the LED package 13, and the outer reflector 24 at a position outside (L side) the LED package 23. The outer reflectors 14 and 24 are made of a predetermined metal having high light reflectance, such as aluminum or copper, and at least one surface (the surface on the side where the LED packages 13 and 23 are arranged) has high light reflectance.

[0030] 2, the positions of the parts 14a, 24a closest to the center position C of the outer reflectors 14, 24 are disposed at a position farther from the irradiated surface than the ends 13a, 23a furthest from the irradiated surface of the LED packages 13, 23 in the second direction. On the other hand, the positions of the parts 14b, 24b furthest from the center position C of the outer reflectors 14, 24 are disposed at a position closer to the irradiated surface than the ends 13b, 23b closest to the irradiated surface of the LED packages 13, 23 in the second direction. As a result, the outer reflectors 14, 24 are disposed at a position overlapping with the LED packages 13, 23 in the first direction, and are configured to block the path of light emitted from the LED packages 13, 23 to the outside (R side or L side).

[0031] 6, the outer reflectors 14, 24 are disposed at a predetermined angle θ2 with respect to a direction parallel to the irradiated surface 37. The predetermined angle θ2 here is preferably an elevation angle of 1 to 4 degrees, more preferably 3 to 30 degrees, and most preferably 5 to 15 degrees.

[0032] The inner reflectors 15, 25 are members that adjust the traveling direction of light, and are plate-like members that are arranged on the central position C side of the corresponding LED packages 13, 23 so as to cover part of the surface of the substrates 12, 22 and extend in the third direction along the substrates 12, 22. The material of the inner reflectors 15, 25 is made of a predetermined metal having high light reflectance, such as aluminum or copper, like the outer reflectors 14, 24, and at least one surface (the surface on the side where the LED packages 13, 23 are arranged) has high light reflectance.

[0033] The inner reflectors 15, 25 are tapered on the surface on which the LED packages 13, 23 are arranged so that the thickness of the portion close to the LED packages 13, 23 is thin. This allows the inner reflectors 15, 25 to efficiently reflect light emitted from the LED packages 13, 23 inward (toward the central position C).

[0034] As shown in Fig. 6, the outer reflectors 14, 24 and the inner reflectors 15, 25 arranged as described above reflect the light (arrows in Fig. 6) emitted from the LED packages 13, 23. In addition to the light emitted from the LED packages 13, 23, they also reflect again the light reflected toward the substrates 12, 22 by covers 17, 27, etc., which will be described later, that is, the light coming from the irradiated surface side (dotted arrows in Fig. 6).

[0035] The covers 17, 27 are made of a light-transmitting plastic or the like, and are arc-shaped members extending in the third direction along the substrates 12, 22. The covers 17, 27 are attached to the support member 11 by a fixing method such as fitting on the R side and the L side of the center position C. The covers 17, 27 are intended to protect the components in the lighting device 10, such as the LED packages 13, 23, the outer reflectors 14, 24, and the inner reflectors 15, 25, from getting dirty.

[0036] In this way, in the lighting device 10 configured as above, the LED packages 13, 23 are arranged so that the strongest illuminance direction M is in a direction having a predetermined angle θ1 from the second direction toward the R side and the L side, so that a wide range can be irradiated, and the outer reflectors 14, 24 arranged at positions overlapping with the LED packages 13, 23 can reduce wasted light leaking to the outside, reducing energy waste and enabling uniform and efficient irradiation of the desired irradiated surface. In addition, the outer reflectors 14, 24 and the inner reflectors 15, 25 reflect the light reflected toward the substrates 12, 22 again, so that the light can be used efficiently, and the substrates 12, 22 are prevented from becoming too hot, contributing to the stable operation of the LED packages 13, 23.

[0037] <Modifications of the lighting device 10> In the lighting device 10 configured as described above, the strongest illuminance direction M of the LED packages 13, 23 is changed from the second direction to the R side and L side by adjusting the installation angle of the substrates 12, 22 themselves with respect to the support member 11. However, the configuration in which the strongest illuminance direction M is disposed in a direction away from the central position C is not limited to this.

[0038] For example, as shown in FIG. 7, the substrates 12 and 22 may be replaced by a substrate 42. In the substrate 42, an inclined surface having a predetermined angle is formed on the surface, and a plurality of LED packages 13, 23 are arranged at predetermined intervals along the third direction on the inclined surface to form an LED row. As a result, the LED packages 13, 23 are arranged such that the strongest illuminance directions M are in the directions at the predetermined angles θ1 from the second direction toward the R side and the L side. Note that other members in this modified example are the same as those in the above-mentioned case.

[0039] <Regarding the cultivation shelf 50 using the lighting device 10> Next, a cultivation shelf 50 using the lighting device 10 having the above configuration will be described with reference to the schematic diagram of Fig. 8. For convenience of illustration, the main parts of the cultivation shelf 50 are shown in a schematic manner in Fig.

[0040] The cultivation shelf 50 is installed in a room in a cultivation factory, which is a structure such as a building or a container whose interior is a closed or semi-closed space. In this cultivation shelf 50, plants, such as leafy vegetables (not shown), are cultivated by a hydroponic method. However, the method of cultivating plants in the cultivation shelf 50 is not limited to the hydroponic method, and may be other methods (for example, a soil cultivation method or a nutrient solution soil cultivation method, etc.).

[0041] 8, the cultivation shelf 50 is a multi-tiered structure including a plurality of frames 51 erected in the vertical direction and a plurality of shelves 52 erected in the horizontal direction between the frames 51. The horizontally erected shelves 52 are lined up in the vertical direction, and each shelf 52 may be anything that allows a plant or the like to be placed thereon, and is preferably a plate or a lattice frame or the like.

[0042] A plurality of cultivation spaces 53, which are rectangular spaces partitioned by the frame 51 and the shelves 52, are stacked vertically on each shelf 52. That is, in the cultivation shelf 50, a plurality of plant cultivation spaces 53 are partitioned by the shelves 52 and lined up vertically. In each cultivation space 53, a plant is cultivated.

[0043] In this embodiment, the shelves 52 are arranged in five vertical levels, and the cultivation space 53 is stacked in four levels, but the number of levels is not limited to this. That is, the number of levels may be more than five or less than five. In addition, the cultivation shelf 50 is not limited to a multi-level type as in this embodiment, and the number of shelves 52 (the number of levels) may be a single level.

[0044] The above-mentioned lighting device 10 is installed on the back side of the shelf 52. That is, in the cultivation shelf 50, the lighting device 10 is used as a member that irradiates the plants being cultivated in the cultivation space 53 with artificial light necessary for photosynthesis. Specifically, the shelves 52 are installed horizontally above each cultivation space 53 (specifically, above the plants cultivated in each cultivation space 53). At this time, the shelves 52 are installed so that the second direction is vertical. The shelves 52 are installed so that the first direction is the longitudinal direction of the shelves 52 and the second direction is the lateral direction of the shelves 52.

[0045] In this embodiment, as an example, a plurality of lighting devices 10 are installed along the longitudinal direction of the shelves 52 in each cultivation space 53. However, from the viewpoints of installation costs, maintenance costs, and risk of failure, it is preferable to install as few lighting devices 10 as possible.

[0046] The lighting device 10 of this embodiment is installed so that the strongest illuminance direction M of the LED packages 13, 23 is in a direction having a predetermined angle θ1 from the second direction (vertical direction) toward the R side and the L side, so that the lighting device 10 can illuminate a wide area in the cultivation space 53, and the outer reflectors 14, 24 can reduce wasted light leaking outside the cultivation space 53. This reduces energy waste, and even with a small number of lighting devices installed, the lighting device 10 can illuminate the plants in the cultivation space 53 uniformly and efficiently. Furthermore, the outer reflecting plates 14, 24 and the inner reflecting plates 15, 25 also re-reflect light reflected from the covers 17, 27 and the water surface of the hydroponic liquid fertilizer, making it possible to utilize the amount of light efficiently. <Other>

[0047] In this embodiment, reflectors (outer reflectors 14, 24 and inner reflectors 15, 25) are used as the first light adjustment member and the second light adjustment member. However, the first light adjustment member and the second light adjustment member are not limited to reflectors as long as they can adjust the path of light. For example, polarizing plates, prisms, lenses, etc. may also be used.

[0048] In the present embodiment, the surface-mounted PLCC (Plastic leaded chip carrier) type is given as an example of the LED packages 13 and 23, but the LED packages are not limited to this. For example, the LED packages may be a surface-mounted PWB (Printed Wiring Board) type, or a flip chip type that is wirelessly connected to the package substrate 32. Alternatively, the LED packages may be linear light sources such as elongated LEDs.

[0049] Furthermore, in this embodiment, an LED is used as the light source of the lighting device 10, but in addition to inorganic or organic LEDs, a wide range of light-emitting devices can be used, including semiconductor light-emitting elements such as lasers, discharge tubes such as fluorescent lamps, mercury lamps, rare gas lamps, and electrodeless lamps, filament light-emitting devices such as incandescent lamps, and devices that utilize energy transition such as synchrotron radiation or fluorescence. [Explanation of symbols]

[0050] 10. Lighting Equipment 11 Support member 12 Substrate 13 LED Package 13a End farthest from the irradiated surface 13b The edge closest to the illuminated surface 14 Outer reflector 14a The part closest to the center position C 14b The part furthest from the center position C 15 Inner reflector 17 Cover 18 Power supply 19 Electronic circuit 20. Interior Space 22 Substrate 23 LED Package 23a End farthest from the irradiated surface 23b End closest to the illuminated surface 24 Outer reflector 24a Part closest to center position C 24b The part furthest from the center position C 25 Inner reflector 27 Cover 31 LED chips 32 Package substrate 33 Lamp House 34 Lead Frame 35 Bonding Wire 36 Sealing resin 37 Irradiated surface 42 Substrate 50 cultivation rack 51 Frames 52 Shelf 53 Cultivation space

Claims

1. Two light emitting members arranged at different positions in a first direction and emitting light toward an irradiated surface; a support member that supports the two light emitting members in a state where a central position in the first direction is located between the two light emitting members; two first light adjustment members that are arranged outside the two light emitting members in the first direction, each of which blocks a path of light emitted toward the outside from a corresponding one of the two light emitting members to adjust a traveling direction of the light toward the central position; and two second light adjusting members arranged inside the two light emitting members in the first direction and adjusting a traveling direction of light coming from the irradiated surface side, Each of the two light emitting members is disposed such that the intensity of the emitted light in a direction away from the central position in the first direction is highest, An illumination device in which each of the two first light adjusting members is disposed at a position overlapping with the corresponding light emitting member in the first direction.

2. Two light emitting members arranged at different positions in a first direction and emitting light toward an irradiated surface; a support member that supports the two light emitting members in a state where a central position in the first direction is located between the two light emitting members; two first light adjustment members arranged outside the two light emitting members in the first direction, each adjusting a traveling direction of light emitted from a corresponding one of the two light emitting members; two second light adjusting members arranged at an angle different from that of the first light adjusting member on the inner side of the two light emitting members in the first direction and adjusting a traveling direction of the light coming from the irradiated surface side; Each of the two light emitting members is disposed such that the intensity of the emitted light in a direction away from the central position in the first direction is highest, An illumination device in which each of the two first light adjusting members is disposed at a position overlapping with the corresponding light emitting member in the first direction.

3. Two light emitting members arranged at different positions in a first direction and emitting light toward an irradiated surface; a support member that supports the two light emitting members in a state where a central position in the first direction is located between the two light emitting members; two first light adjustment members arranged outside the two light emitting members in the first direction, each adjusting a traveling direction of light emitted from a corresponding one of the two light emitting members; and two second light adjusting members arranged inside the two light emitting members in the first direction and adjusting a traveling direction of light coming from the irradiated surface side, Each of the two light emitting members is disposed such that the intensity of the emitted light in a direction away from the central position in the first direction is highest, each of the two first light adjustment members is positioned at a position overlapping with the corresponding light-emitting member in the first direction, and the portions of the two first light adjustment members farthest from the central position are positioned closer to the irradiated surface than the corresponding light-emitting member in a second direction which is a normal direction to the irradiated surface.

4. 4. The lighting device according to claim 1, wherein a portion of the first light adjustment member closest to the central position is located farther from the irradiated surface than the corresponding light-emitting member in a second direction that is a normal direction of the irradiated surface.

5. The two light emitting members are attached to a substrate, The lighting device according to claim 1 , wherein the second light adjusting member is disposed at a position covering a part of the substrate.

6. The lighting device according to claim 1 , wherein the first light adjusting member or the second light adjusting member is a reflecting plate.

7. 7. The lighting device according to claim 1, wherein an angle between a second direction that is a normal direction to the illuminated surface and a direction in which the intensity of the emitted light is the highest is 5 to 90 degrees.

8. A cultivation shelf using the lighting device according to any one of claims 1 to 7.

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