JP7529655B2 - LED lighting device, cultivation shelf, and cultivation method - Google Patents

Description

This invention relates to an LED lighting device, a cultivation shelf, and a cultivation method.

In plant factories, artificial lighting is installed on the cultivation shelves and plants are grown inside the shelves. A typical setup is to install lighting at the top of the shelves and hydroponic cultivation equipment at the bottom of the shelves.

Shelf lighting mainly illuminates the shelf, but some of the light leaks outside the shelf. For this reason, as in Patent Document 1, for example, reflective panels are installed on the sides of the shelves to reflect the light that leaks outside back inward for effective use.

However, the method of Patent Document 1 had the problem that the shelves prevented air from flowing in and out, increasing the humidity inside the shelves and inhibiting plant growth. In addition, the presence of the reflectors made it difficult to observe and care for the plants inside the shelves. Furthermore, most reflectors required regular replacement and cleaning, making maintenance a time-consuming task.

On the other hand, for example, efforts have been made to limit the illuminated area by installing reflectors on LED lighting, as disclosed in Patent Document 2.

JP 2018-61442 A JP 2018-10748 A

However, the main purpose of Patent Document 2 is to suppress changes in light distribution characteristics caused by distortion of the reflector due to thermal stress, and the method of Patent Document 2 does not take any measures to thoroughly irradiate the light in the vicinity of the LED lighting and prevent it from leaking outside of that area.

The present invention has been made to solve the above-mentioned problems, and aims to provide an LED lighting device, a cultivation shelf, and a cultivation method that can prevent light from leaking outside the LED lighting device without the need to install a reflector on the side of the shelf.

One aspect of an LED lighting device of the present invention comprises an LED row consisting of a plurality of LED packages arranged at intervals in the longitudinal direction in an arrangement area of a predetermined width extending in the longitudinal direction, and light irradiation direction changing members which are arranged within at least some of the above-mentioned intervals, at least within a predetermined range from at least one end of the LED row, and which change the direction of light irradiation from the LED packages from the end side of the LED row to the center side of the LED row, and the light irradiation direction changing member has a reflector arranged on a part of the periphery of the LED packages.
According to the above LED lighting device, it is possible to prevent light from leaking outside the LED lighting device without providing a reflector on the side surface of the cultivation shelf.

One embodiment of a cultivation shelf in the present invention comprises a rectangular parallelepiped frame unit having a rectangular upper frame, a lower frame of the same shape as the upper frame, and a plurality of supports connecting the four corners of the upper frame to the four corners of the lower frame, a cultivation area section installed on the lower frame, and LED lighting devices of the above embodiment installed at multiple points between the long sides of the upper frame, approximately perpendicular to the long sides.
According to the above-mentioned cultivation shelf, it is possible to prevent light from leaking outside the LED lighting device without providing a reflector on the side surface of the cultivation shelf.

One aspect of the cultivation method of the present invention is a cultivation method using the cultivation shelf of the above aspect, in which a cultivated object planted in the cultivation area is cultivated by irradiating light from an LED lighting device onto the cultivated object.
According to the above-described cultivation method, it is possible to prevent light from leaking outside the LED lighting device without providing a reflector on the side surface of the cultivation shelf.

According to the present invention, it is possible to prevent light from leaking outside the LED lighting without having to install a reflector on the side of the cultivation shelf.

1 is a diagram showing a schematic configuration of a cultivation shelf according to an embodiment of the present invention; 1 is a diagram showing a schematic configuration of a cultivation rack frame according to an embodiment of the present invention; This is a view of the cultivation shelf viewed from the short side of the upper frame of the cultivation rack frame along the long side. This is a view of the cultivation shelf viewed from the long side of the upper frame of the cultivation rack frame along the short side. This is a view of the LED row as viewed from the short side of the upper frame of the cultivation rack frame along the long side. This is a view of the LED row from the cultivation bed side. This is a view of the LED row and the reflector unit as viewed from the short side of the upper frame of the cultivation rack frame along the long side. This is a diagram showing an LED lighting device that combines an LED row and a reflector unit, as viewed from the short side of the upper frame of a cultivation rack frame along the long side. FIG. 1 is a diagram showing an LED lighting device combining an LED row and a reflector unit, as viewed from the cultivation bed side. FIG. This is a view of the reflector unit as seen from the short side of the upper frame of the cultivation rack frame along the long side. FIG. 11 is a perspective view of a reflector unit according to another embodiment. A view of a reflector unit of another embodiment, viewed from the short side of the upper frame of the cultivation rack frame along the long side. FIG. 13 is a diagram showing an example in which a reflector is placed near an LED package and the size of the reflector is small. 13 is a diagram showing an example in which the reflector is disposed away from the LED package and is large in size. FIG. FIG. 13 is a diagram showing the results of a simulation of the light distribution of an LED package without a reflector. 11 is a diagram illustrating an angle between a reflector and a base material serving as an arrangement surface. FIG. FIG. 13 is a diagram showing a simulation result when the angle θ of the reflector is 90 degrees. FIG. 13 is a diagram showing a simulation result when the angle θ of the reflector is 110 degrees. FIG. 13 is a diagram showing relative intensity when the displacement angle is 70 degrees. FIG. 13 is a diagram showing relative intensity when the displacement angle is 90 degrees. FIG. 13 is a diagram showing relative intensity when the displacement angle is 90 degrees. 1A and 1B are diagrams showing an LED lighting device provided with a refractive lens as an example of a light irradiation direction changing member. FIG. 13 is a diagram showing a first modified example of the arrangement of LED packages. FIG. 13 is a diagram showing a second modified example of the arrangement of LED packages. FIG. 13 is a diagram showing a third modified example of the arrangement of LED packages. FIG. 13 is a diagram showing a fourth modified example of the arrangement of LED packages. FIG. 13 is a diagram showing a fifth modified example of the arrangement of LED packages. FIG. 13 is a diagram showing a first modified example of the arrangement of the reflecting plate. FIG. 13 is a diagram showing a second modified example of the arrangement of the reflecting plate. FIG. 13 is a diagram showing a third modified example of the arrangement of the reflecting plate. FIG. 13 is a diagram showing a fourth modified example of the arrangement of the reflecting plate. 13A and 13B are diagrams for explaining the shape of a reflector in a modified example.

Hereinafter, one embodiment of the present invention (hereinafter, this embodiment) will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a cultivation shelf 100 according to this embodiment. As shown in FIG. 1, the cultivation shelf 100 includes a cultivation rack frame 10 as a frame unit, a cultivation bed 20 as a cultivation area, and an LED lighting device 30.

2 is a diagram showing a schematic configuration of the cultivation rack frame 10 according to this embodiment. As shown in FIG. 2, the cultivation rack frame 10 is a rectangular frame unit having a rectangular upper frame 10a, a lower frame 10b having the same shape as the upper frame 10a, and a plurality of supports 10c connecting the four corners of the upper frame 10a and the four corners of the lower frame 10b. The cultivation shelf 100 shown in FIG. 1 shows an example in which four such cultivation rack frames 10 are stacked on top of each other.

Materials for the upper frame 10a, the lower frame 10b, and the support 10c include, for example, iron, aluminum, and plastic. The long sides of the upper frame 10a and the lower frame 10b have a length of, for example, about 8 m, and the short sides of the upper frame 10a and the lower frame 10b have a length of, for example, about 1.5 m. The lengths of the long and short sides of the upper frame 10a and the lower frame 10b can be changed as appropriate. The support 10c has a length of, for example, about 0.3 m. The length of the support 10c can be changed as appropriate. When using metal for the frame, it is preferable to plate it to prevent corrosion due to cultivation water, etc.

In addition, when the cultivation rack frames 10 are stacked for use, the upper frame 10a of the lower cultivation rack frame 10 can also be used as the lower frame 10b of the upper cultivation rack frame 10.

Figure 3A is a view of the cultivation shelf 100 viewed along the long side direction from the short side side of the upper frame 10a and lower frame 10b of the cultivation rack frame 10, and Figure 3B is a view of the cultivation shelf 100 viewed along the short side direction from the long side side of the upper frame 10a and lower frame 10b of the cultivation rack frame 10.

As shown in Figures 3A and 3B, the cultivation bed 20 is placed on the lower frame 10b of the cultivation rack frame 10. Also, as shown in Figures 3A and 3B, the mounting brackets 40 of the LED lighting device 30 are attached to the upper frame 10a of the cultivation rack frame 10. As shown in Figure 3A, the mounting brackets 40 are attached to, for example, four locations in the short side direction of the upper frame 10a of the cultivation rack frame 10, and as shown in Figure 3B, the mounting brackets 40 are attached to, for example, two locations in the long side direction of the upper frame 10a of the cultivation rack frame 10.

Also, as shown in FIG. 3A, the effective cultivation dimension L, which is defined by the distance from the mounting bracket 40 to which the LED lighting device 30 is attached to the cultivation bed 20, is set to, for example, 295 mm.

In addition, the support 10c of the lowest cultivation rack frame 10 is provided with an adjuster 50 that can adjust the height of the cultivation shelf 100. In the example shown in Figures 3A and 3B, the upper frame 10a and the lower frame 10b of the lowest cultivation rack frame 10 are omitted.

As shown in Figure 1, the LED lighting devices 30 are installed at multiple locations between the long sides of the upper frame 10a of the cultivation rack frame 10, approximately perpendicular to the long sides (i.e., at an angle of approximately 85 degrees to 95 degrees with respect to the long sides). The LED lighting devices 30 are also installed approximately parallel to each other (including cases where the LED lighting devices 30 are shifted from a parallel state by approximately -15 degrees to 15 degrees, preferably approximately -10 degrees to 10 degrees, and more preferably approximately -5 degrees to 5 degrees).

Figure 4A is a view of the LED row 30a in the LED lighting device 30 of this embodiment, viewed from the short side of the upper frame 10a in the cultivation rack frame 10 along the long side. Figure 4B is a view of the LED row 30a viewed from the cultivation bed 20 side. Figure 4C is a view of the LED row 30a in the LED lighting device 30 and the reflector unit 60 as a light irradiation direction changing member, viewed from the short side of the upper frame 10a in the cultivation rack frame 10 along the long side. Figure 4D is a view of the LED lighting device 30 in which the LED row 30a and the reflector unit 60 are combined, viewed from the short side of the upper frame 10a in the cultivation rack frame 10 along the long side. Figure 4E is a view of the LED lighting device 30 in which the LED row 30a and the reflector unit 60 are combined, viewed from the cultivation bed 20 side.

As shown in FIG. 4A, in the LED row 30a, multiple LED packages 30c are arranged on a base material 30b extending in the longitudinal direction, with spacing between them in the longitudinal direction of the base material 30b. In other words, the multiple LED packages 30c are arranged in an arrangement area of a predetermined width extending in the longitudinal direction, with spacing between them in the longitudinal direction of the arrangement area. The spacing is set to, for example, 22 mm. The maximum spacing between the LED packages 30c is 100 mm or less, preferably 50 mm or less, and particularly preferably 20 mm or less. For example, 128 LED packages 30c are arranged. However, the number of LED packages 30c in the LED row 30a can be changed as appropriate.

The LED packages 30c are divided into red/blue types, white types, etc., depending on the color of the LED light. The width of one LED package 30c in the short side direction of the upper frame 10a of the cultivation rack frame 10 (the longitudinal direction of the base material 30b) is, for example, about 2 to 3 mm. However, the width of the LED package 30c can be changed as appropriate.

In this embodiment, as shown in FIG. 4A, a predetermined range from one end 30d of the LED row 30a and a predetermined range from the other end 30d are referred to as end-side regions. In addition, a region other than the end-side region of the LED row 30a is referred to as a central region.

In this embodiment, a reflector unit 60 is arranged in the end side region of the LED row 30a in correspondence with each LED package 30c arranged in the end side region, and serves as a light irradiation direction changing member that changes the irradiation direction of light from the LED package 30c from the end 30d side of the LED row 30a to the central side of the LED row 30a.

As shown in FIG. 4C, the reflector unit 60 is formed integrally with the base material 60a and the reflector 60b. Such a reflector unit 60 is attached to the LED row 30a as shown in FIG. 4D. As a result, as shown in FIG. 4E, the reflector 60b is arranged within the space in which the LED packages 30c are arranged. The reflector 60b is not the LED package 30c, and is not a component of the LED package 30c. In addition, as in this embodiment, the reflector unit 60 is formed as a separate member from the LED row 30a, and is attached to the LED row 30a after formation, which makes it easier to manufacture the LED lighting device 30.

The material of the reflector 60b may be any material that has high reflectivity. The reflector 60b may have either regular reflectivity or total reflectivity, and it is preferable that the amount of light absorbed is small. In this embodiment, as an example, the reflector 60b has a reflectivity of 50% or more.

Examples of materials for the reflector 60b include oxides, plastics, and metals. Specifically, the following materials may be used alone or in the form of a coating made of powder. Examples of materials include magnesium carbonate, barium sulfate, aluminum oxide, titanium oxide, zinc oxide, lithopone, white lead, gold, silver, copper, platinum, aluminum, nickel, tin, tungsten, chrome, paper, pulp, cloth, white paint, glass, and tiles. Among these, titanium oxide, zinc oxide, barium sulfate, magnesium carbonate, and aluminum are preferred.

The material of the reflector 60b is preferably a titanium oxide-containing material, which can achieve a reflectance of 70% or more, depending on the particle size and content. Also, materials such as silver, aluminum, and gold can achieve a reflectance of 70% or more.

In a predetermined number of reflectors 60b provided near the end 30d of the LED row 30a, the angle between the arrangement surface of the reflector 60b and the reflecting surface of the reflector 60b is smaller than that of the remaining reflectors 60b.

Figure 5A is an oblique view of the reflector unit 60, and Figure 5B is a view of the reflector unit 60 viewed from the short side of the upper frame 10a of the cultivation rack frame 10 along the long side. As shown in Figure 5A, the base material 60a of the reflector unit 60 has an opening 60c between adjacent reflectors 60b. By arranging the LED packages 30c of the LED row 30a in the opening 60c, the LED lighting device 30 is formed by combining the LED row 30a with the reflector unit 60, as shown in Figure 4C.

Figure 6A is a perspective view of a reflector unit 60 of another embodiment, and Figure 6B is a view of the reflector unit 60 viewed from the short side of the upper frame 10a of the cultivation rack frame 10 along the long side. The reflective surface of the reflector 60b of the reflector unit 60 is not limited to a flat plate, and may be curved as shown in Figures 6A and 6B.

Figure 7A shows an example in which the reflector 60b is positioned close to the LED package 30c and the size of the reflector 60b is small, and Figure 7B shows an example in which the reflector 60b is positioned away from the LED package 30c and the size of the reflector 60b is large.

The width of the light-emitting surface of the LED package 30c in the short side direction of the upper frame 10a of the cultivation rack frame 10 is approximately 2 to 3 mm, but the light from the light-emitting surface is irradiated over a relatively wide irradiation range. Therefore, when controlling this light distribution, if the reflector 60b' is placed far from the LED package 30c as shown in Figure 7B, it will affect not only the light from the single LED package 30c, but also the light from other LED packages 30c. Therefore, in this case, as shown in Figure 7B, unless a large reflector 60b' is provided, reflection control cannot be performed effectively.

However, as shown in Figure 7A, by arranging the reflector 60b so that the distance between the reflector 60b and the LED package 30c is 1 to 2 times the width of the LED package 30c, the light from the other LED packages 30c is not affected. Therefore, when arranging the reflector 60b in the above-mentioned position, reflection control can be effectively achieved by making the height of the reflector 60b (the distance from the surface of the base material 60a to the top end of the reflector 60b) 2 to 3 times the width of the LED package 30c.

In this embodiment, as an example, the LED package 30c has a width of about 2 mm in the short side direction of the upper frame 10a of the cultivation rack frame 10, and the position of the reflector 60b is set to a position about 2 mm away from the center of the adjacent LED package 30c. In addition, the height of the reflector 60b from the arrangement surface is set to about 5 mm.

Next, the effect of the reflector 60b will be described. Figure 8A is a diagram showing the results of simulating the light distribution of the LED package 30c without the reflector 60b. Figure 8B is a diagram explaining the angle between the reflector 60b and the base material 60a as the arrangement surface.

The example shown in Figure 8A shows the results of simulating the spread of LED light from an LED package 30c placed at the 0 mm position when the LED packages 30c are lined up from the 0 mm position to the 1200 mm position, with the reference position being the 0 mm position. As shown in Figure 8A, when the reflector 60b is not placed, it can be seen that the light emitted from the LED package 30c placed at the 0 mm position spreads up to the 1200 mm position. Also, as shown in Figure 8A, it can be seen that the light spreads in the negative direction where the LED packages 30c are not placed in a row.

If the LED package 30c placed at 0 mm is an LED package 30c placed near the end of the LED row 30a, the light spreading in the negative direction will leak out from the outside of the cultivation shelf 100, making it impossible to utilize the LED light efficiently.

Therefore, let us consider the case where a reflector 60b with a height of 5 mm and an angle θ of 90 degrees is placed 2 mm away from the light-emitting point of the LED package 30c, as shown in Figure 8B. Figure 9A shows the simulation results when the angle θ of the reflector 60b is 90 degrees, and Figure 9B shows the simulation results when the angle θ is 110 degrees.

9A and 9B, the light reflected by the reflector 60b is depicted as an annular shape. As shown in Fig. 9A, when the angle θ of the reflector 60b is 90 degrees, the light is no longer emitted in the negative direction, but the light distribution in the illumination area directly below the LED package 30c is reduced.

On the other hand, as shown in Figure 9B, when the angle θ of the reflector 60b is 110 degrees, the light only spreads to the irradiation surface 300 mm away, and the light is not irradiated beyond about 100 mm from the light-emitting point. In other words, by setting the angle θ of the reflector 60b to 110 degrees, it is possible to prevent light from being irradiated in the negative direction while ensuring the light distribution in the illumination area directly below the LED package 30c.

In this embodiment, based on the results of the above-mentioned simulation, a reflector unit 60 is provided in the end region of the LED row 30a to prevent leakage of light from outside the cultivation shelf 100 while improving the uniformity of the light distribution and the light distribution efficiency (the proportion of the amount of light irradiated onto the effective area out of the total amount of light irradiated from the LED lighting device 30).

Figure 10A shows the relative intensity when the bending angle (angle θ shown in Figure 8B) is 70 degrees, Figure 10B shows the relative intensity when the bending angle is 90 degrees, and Figure 10C shows the relative intensity when the bending angle is 90 degrees. Note that the relative intensities shown in Figures 10A to 10C were calculated, and are the light intensities calculated assuming that the reflectance of reflector 60b is 80% regular reflectance.

As shown in Figure 10A, when the angle of change is 70 degrees, all of the light from the LED package 30c is irradiated to an effective area of 0 mm to 1200 mm. As a result, the light distribution efficiency is improved from 80% to 96%.

As shown in Figure 10B, when the angle of change is 90 degrees, the light distribution efficiency is improved from 80% to 91%. Although the light distribution efficiency is inferior to when the angle of change is 70 degrees, it can be seen that the uniformity of the light distribution is improved.

In this embodiment, the angle of the reflector 60b is individually adjusted to achieve both maximum light intensity and flat light distribution. As shown in Figure 10C, by individually adjusting the angle of the reflector 60b, the light distribution efficiency was increased to 96% and the uniformity of the light distribution was improved.

As described above, according to this embodiment, small reflectors 60b are attached to the vicinity of the LED packages 30c in the end region in correspondence with each LED package 30c. As a result, light leaking outside the cultivation shelf 100 can be returned to the inside of the cultivation shelf 100, and the light emitted from the LED packages 30c can be effectively suppressed. In addition, by changing the angle of the reflector 60b according to the arrangement position of the LED packages 30c, the irradiation distribution within the cultivation shelf 100 can be improved.

In addition, in the above-described cultivation shelf 100, the LED lighting device 30 can be used to irradiate light onto the cultivated object, such as a plant, planted in the cultivation bed 20, thereby efficiently cultivating the cultivated object. Plant growth is based on photosynthesis. By achieving more photosynthesis, the plant body will become larger and productivity will increase. In artificial light plant cultivation, increasing the amount of light leads to increased photosynthesis, which in turn increases productivity. The present invention irradiates the plant body with light that was not irradiated onto the plant body and was discarded outside the shelf, which can be expected to result in increased productivity. In addition, examples of cultivated objects other than plants include mushrooms, fish, microorganisms, and cells.

(Modification)
The above-described embodiment is merely an example, and various modifications are possible without departing from the spirit and scope of the present invention.

In the above embodiment, the reflector unit 60 is used as an example of a light irradiation direction changing member, but the present invention is not limited to such an embodiment. For example, as shown in Fig. 11, a refractive lens 70 may be provided as a light irradiation direction changing member corresponding to the LED package 30c in the end side region, so that the light emitted from the LED package 30c is concentrated toward the center.

In the above embodiment, the angle of the reflector 60b is individually adjusted, but the present invention is not limited to such an embodiment. For example, the angle of the reflector 60b may be uniform among the reflectors 60b.

The range in which the reflectors 60b, etc. are arranged can be set arbitrarily, but it is preferable to arrange them corresponding to at least six or more LED packages 30c, counting from the end 30d of the LED row 30a. For example, in the case of an LED lighting device 30 in which the LED packages 30c are arranged at 20 mm intervals and the length of the LED row 30a is 1000 mm, the reflectors 60b, etc. are arranged corresponding to at least six or more LED packages 30c. In this case, the light distribution of the LED packages 30c within a range of 100 mm from the end 30d is controlled. As a result, it is possible to adjust the light by more than 10%, i.e., 10% on one end side and 20% on both end sides, improving the distribution, and a clear effect can be expected.

In the above embodiment, the LED packages 30c are arranged in a row at regular intervals, but the present invention is not limited to this. For example, as shown in Fig. 12A, several LED packages 30c may be grouped into one group, and the intervals between the LED packages 30c within the group may be set to a constant value, and the intervals between groups may be set to be larger and constant than the intervals between the LED packages 30c.

As shown in Fig. 12B, the spacing between the LED packages 30c does not have to be constant. Furthermore, as shown in Fig. 12C, the positions of the LED packages 30c in the short-side direction of the substrate 30b may vary.

Also, as shown in Fig. 12D, the LED packages 30c may be arranged in multiple rows on the base material 30b. Furthermore, as shown in Fig. 12E, the number of LED packages 30c in the short direction of the base material 30b may be combined with an arrangement in which multiple LED packages 30c are arranged and an arrangement in which only one LED package is arranged.

In the above embodiment, the reflector 60b is arranged corresponding to each LED package 30c, but the present invention is not limited to such an embodiment. For example, as shown in Figures 13A and 13B, the reflector 60b may be omitted in places. Also, as shown in Figure 13C, the reflector 60b may not be arranged at a position corresponding to the first predetermined number of LED packages 30c counting from the end 30d. Furthermore, as shown in Figure 13D, the reflector 60b may be arranged only on one end side of the LED row 30a, rather than on both end sides of the LED row 30a.

In the above embodiment, one reflector 60b acts on one LED package 30c, but the reflector 60b can act on the LED packages 30c on both sides of the installation location, as shown in Figure 14. In that case, it is preferable to have a reflector shape that changes the light direction for the light on both sides of the reflector 60b.

This specification describes an LED lighting device according to one embodiment of the present invention, but the present invention is not limited thereto, and various modifications are possible without departing from the gist of the present invention.

REFERENCE SIGNS LIST 10 Cultivation rack frame 10a Upper frame 10b Lower frame 10c Support 20 Cultivation bed 30 LED lighting device 30a LED row 30b Base material 30c LED package 30d End 40 Mounting metal fitting 50 Adjuster 60 Reflector unit 60a Base material 60b Reflector 70 Refractive lens 100 Cultivation shelf

Claims (10)

an LED row including a plurality of LED packages arranged at intervals in a longitudinal direction in an arrangement region of a predetermined width extending in the longitudinal direction;
a light irradiation direction changing member that is disposed within at least some of the intervals in at least a predetermined range from at least one end of the LED row, and that does not change the irradiation direction of light from the LED package toward a center of the LED row toward the end of the LED row, but changes the irradiation direction of light from the LED package toward the end of the LED row toward the center of the LED row,
The light irradiation direction changing member has a reflector disposed on a part of the periphery of the LED package. the reflector is disposed on an end side of the LED row that is a starting point of the predetermined range in which the LED packages are disposed, as viewed from each of the LED packages;
2. The LED lighting device according to claim 1 . Each of the reflectors is disposed within the interval from the center of each of the LED packages, at a position that is 1 to 2 times the width of the LED package in the longitudinal direction, and has a height from an arrangement surface that is 2 to 3 times the width of the LED package.
3. The LED lighting device according to claim 1 or 2. Among the reflectors, a predetermined number of the reflectors provided at positions close to an end of the LED row have a smaller angle between a reflection surface and an arrangement surface than the remaining reflectors.
4. The LED lighting device according to claim 1, wherein the LED lighting device is a light-emitting diode (LED) light source. The reflectance of the reflector is 50% or more.
5. The LED lighting device according to claim 1, wherein the LED lighting device is a light-emitting diode (LED) light source. The light irradiation direction changing member is a refractive lens provided so as to cover each of the LED packages.
6. The LED lighting device according to claim 1, wherein the LED lighting device is a light-emitting diode (LED) light source. The light irradiation direction changing member is arranged for at least six or more of the LED packages, counting from an end of the LED row.
7. The LED lighting device according to claim 1, wherein the LED lighting device is a light-emitting diode (LED) light source. a rectangular parallelepiped frame unit including a rectangular upper frame, a lower frame having the same shape as the upper frame, and a plurality of supports connecting four corners of the upper frame and four corners of the lower frame;
A cultivation area section installed on the lower frame;
and the LED lighting device according to any one of claims 1 to 7, which is installed at a plurality of positions between long sides of the upper frame and substantially perpendicular to the long sides.
A cultivation shelf characterized by the above. The LED lighting devices are arranged substantially parallel to each other.
The cultivation shelf according to claim 8 . A cultivation method using the cultivation shelf according to claim 8 or 9,
The LED lighting device irradiates light onto the cultivated object planted in the cultivation area to cultivate the cultivated object.
This is how it is cultivated.