Light irradiation method, lighting device, and lighting system for plant growth

Abstract

To provide light irradiation methods, lighting apparatus, and lighting systems for plant growth, which can grow plants, maintain grass vigor, and improve the appearance of plants.SOLUTION: The light irradiation method for plant growth comprises: irradiating a plant with white light and red light using a white light emitting diode 11 that emits white light and a red light emitting diode 12 or a red phosphor that emits red light; controlling the radiant energy of the red light emitted from the red light emitting diode 12 or the red phosphor to be 1 / 2 or less of the radiant energy of the white light emitted from the white light emitting diode 11; and controlling at least one of the white and red light irradiation ranges, irradiation directions, and illuminances, depending on at least one of the plant size, shape, and growth stage.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a light irradiation method for plant growth, a lighting device, and a lighting system. [Background technology]

[0002] Conventional Patent Document 1 discloses a lighting device for growing plants that includes an irradiation means for irradiating a plant with light and a control means for controlling the irradiation energy of the light emitted by the irradiation means. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5335721 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional light irradiation method for plant growth using a lighting device for plant growth, it is not possible to adjust the optimal light irradiation range and irradiation time according to the size and shape of the plant, and it is difficult to adjust the growth of the plant by light irradiation. Therefore, it is difficult to grow the plant into a desired shape. In addition, since the appearance of the plant irradiated with light does not change, people may get bored of looking at the plant.

[0005] Therefore, an object of the present disclosure is to provide a light irradiation method, lighting device, and lighting system for plant growth that can grow plants, maintain their vigor, and improve the appearance of the plants. [Means for solving the problem]

[0006] A light irradiation method for plant growth according to one aspect of the present disclosure includes: using a white light-emitting diode that emits white light and a red light-emitting diode or a red phosphor that emits red light, irradiating the white light and the red light to a plant; controlling a radiant energy of the red light emitted from the red light-emitting diode or the red phosphor to be half or less of the radiant energy of the white light emitted from the white light-emitting diode; and controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light in accordance with at least one of a size, a shape, and a growth stage of the plant; and controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light to promote growth of the plant. In a mode for suppressing leaf fall and for maintaining the vigor of the plant by controlling at least one of the irradiation range, irradiation direction, and illuminance of the white light and the red light; Maintain the vigor of the plant; and a mode for suppressing defoliation of the plant. When executing a mode for promoting the growth of the plant, the white light and the red light are irradiated with 1200 lx or more and less than 3000 lx to a growth point of the plant including a top part of the plant; when executing a mode for maintaining the vigor of the plant, the white light and the red light are irradiated with 600 lx or more and 1000 lx or less to the growth point of the plant; and when executing a mode for maintaining the vigor of the plant and suppressing the occurrence of defoliation of the plant, the white light and the red light are irradiated to a portion of the plant that is 1 / 2 or less of a height H of the plant. Includes.

[0007] Moreover, an illumination device according to an aspect of the present disclosure includes a light source having a white light-emitting diode that emits white light and a red light-emitting diode or a red phosphor that emits red light, and irradiating the white light and the red light to a plant; and a control unit that controls a radiant energy of the red light emitted from the red light-emitting diode or the red phosphor to be half or less of a radiant energy of the white light emitted from the white light-emitting diode, and controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light in accordance with at least one of a size, a shape, and a growth stage of the plant, and the control unit controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light to promote growth of the plant, by controlling at least one of the irradiation range, the irradiation direction, and the illuminance of the white light and the red light. In a mode for suppressing leaf fall and for maintaining the vigor of the plant by controlling at least one of the irradiation range, irradiation direction, and illuminance of the white light and the red light; Maintain the vigor of the plant; and a mode for suppressing leaf fall in the plant. When executing a mode for promoting the growth of the plant, the light source irradiates a growth point of the plant including a top part of the plant with the white light and the red light of 1200 lx or more and less than 3000 lx, when executing a mode for maintaining the vigor of the plant, the light source irradiates the growth point of the plant with the white light and the red light of 600 lx or more and 1000 lx or less, and when executing a mode for maintaining the vigor of the plant and suppressing the occurrence of leaf fall in the plant, the light source irradiates a portion of the plant that is 1 / 2 or less of a height H of the plant with the white light and the red light. do.

[0008] Moreover, an illumination system according to an aspect of the present disclosure includes an illumination device having a white light-emitting diode that emits white light and a red light-emitting diode or a red phosphor that emits red light, and irradiating the white light and the red light to a plant; and a control unit that controls a radiant energy of the red light emitted from the red light-emitting diode or the red phosphor to be half or less of the radiant energy of the white light emitted from the white light-emitting diode, and controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light in accordance with at least one of a size, a shape, and a growth stage of the plant, and the control unit controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light to promote growth of the plant and In a mode for suppressing leaf fall and for maintaining the vigor of the plant by controlling at least one of the irradiation range, irradiation direction, and illuminance of the white light and the red light; Maintain the vigor of the plant; and a mode for suppressing leaf fall in the plant. When executing a mode for promoting the growth of the plant, the lighting device irradiates a growth point of the plant including a top part of the plant with the white light and the red light of 1200 lx or more and less than 3000 lx, when executing a mode for maintaining the vigor of the plant, the lighting device irradiates the growth point of the plant with the white light and the red light of 600 lx or more and 1000 lx or less, and when executing a mode for maintaining the vigor of the plant and suppressing the occurrence of defoliation of the plant, the lighting device irradiates a portion of the plant that is equal to or less than 1 / 2 of the height H of the plant with the white light and the red light. do. Effect of the Invention

[0009] According to the light irradiation method for plant growth disclosed herein, it is possible to grow plants, maintain their vigor, and improve the appearance of the plants. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing how a lighting device of a lighting system according to a first embodiment irradiates light onto a plant. [Diagram 2] FIG. 2 is a block diagram of the lighting system according to the first embodiment. [Diagram 3] FIG. 3 is a diagram showing the spectrum of white light emitted by a white light emitting diode, red light emitted by a red light emitting diode, or red light emitted by a red phosphor in the lighting system according to the first embodiment. [Figure 4] FIG. 4a is a schematic diagram showing how the lighting device controls light distribution to change the irradiation range and illuminance, and FIG. 4b is a schematic diagram showing how the lighting device controls light distribution to change the irradiation direction. [Diagram 5] FIG. 5a is a schematic diagram showing how the lighting device controls light distribution to irradiate 1200 lx light onto the growth point and 600 lx light onto the lower leaves of the plant, and FIG. 5b is a schematic diagram showing how the lighting device controls light distribution to irradiate 600 lx to 1000 lx light onto the growth point and 600 lx light onto the lower leaves of the plant. [Figure 6] FIG. 6 is a diagram showing the relationship between the elongation of a plant and the number of days when the lighting device of the lighting system according to the first embodiment irradiates the plant with light. [Figure 7] FIG. 7 is a diagram showing the relationship between the number of fallen leaves of a plant and the number of days when the lighting device of the lighting system according to the first embodiment irradiates the plant with light. [Figure 8] FIG. 8 is a flowchart showing the processing of the lighting system according to the first embodiment. [Figure 9A] FIG. 9A is a schematic diagram showing how light is emitted when the lighting devices of the lighting system according to the second embodiment are disposed above and below a plant. [Figure 9B] FIG. 9B is a schematic diagram showing the appearance when the upper lighting device irradiates light onto a plant and the appearance when the lower lighting device irradiates light onto a plant. [Figure 10] FIG. 10 is a diagram showing the relationship between plant elongation and illuminance, the relationship between the number of fallen leaves and illuminance, and the relationship between photosynthetic sensitivity and illuminance when a lighting device of the lighting system according to embodiment 2 irradiates light onto the growing point of the plant. [Figure 11] FIG. 11 is a diagram showing the relationship between plant elongation and illuminance, the relationship between the number of fallen leaves and illuminance, and the relationship between photosynthetic sensitivity and illuminance when a lighting device of a lighting system according to embodiment 2 irradiates light onto the lower leaves of a plant. [Figure 12] FIG. 12 is a block diagram of a lighting system according to the third embodiment. [Figure 13]FIG. 13 is a flowchart showing the processing of the lighting system according to the third embodiment. [Figure 14] FIG. 14 is a diagram showing the relationship between the photosynthetic sensitivity and the irradiation angle, and the relationship between the luminance and the irradiation angle when the first lighting device on the upper side irradiates light to a plant. [Figure 15] FIG. 15 is a diagram showing the relationship between the photosynthetic sensitivity and the irradiation angle, and the relationship between the luminance and the irradiation angle when the second lighting device on the lower side irradiates light to a plant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component arrangement and connection forms, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components that are not described in the independent claims are described as optional components.

[0012] Hereinafter, the embodiment will be specifically described with reference to the drawings.

[0013] (Embodiment 1) <Configuration: Lighting system 1> FIG. 1 is a schematic diagram showing how a lighting device 10 of a lighting system 1 according to the first embodiment irradiates light onto a plant.

[0014] As shown in FIG. 1, a lighting system 1 irradiates light to a target plant for growing or appreciating the plant, thereby improving the plant's growth and appearance. For example, in this lighting system 1, a lighting device 10 irradiates light to a plant placed in a poorly lit location, such as indoors. The light irradiated to the plant is white light and red light. In this embodiment, white light and red light are sometimes collectively referred to as light. Moreover, white light is a light color that humans can recognize as white. Moreover, red light is a light color that humans can recognize as red, for example, light with a wavelength of 610 nm to 750 nm.

[0015] The plant is, for example, an ornamental plant. Ornamental plants are, for example, potted plants that mainly bear flowers, herbs or foliage plants that do not bear flowers, vegetables such as tomatoes and eggplants, and fruit-bearing plants such as mandarin oranges and grapes. In addition, the plant is not limited to these examples and may be other plants.

[0016] FIG. 2 is a block diagram of the lighting system 1 according to the first embodiment.

[0017] As shown in FIG. 2, the lighting system 1 includes one or more lighting devices 10, a control unit 20, a storage unit 30, an operation unit 40, and a power supply unit 50.

[0018] [Lighting equipment 10] Each of the one or more lighting devices 10 irradiates a plant with white light and red light. In this embodiment, unless otherwise specified, one lighting device 10 is used to irradiate a plant with light, and therefore, one lighting device 10 will be mainly described.

[0019] The lighting device 10 is capable of changing the light distribution and brightness of the emitted light. The light distribution is the irradiation direction and irradiation range of the light emitted by the lighting device 10. For example, when changing the irradiation direction of the light, the lighting device 10 rotates or the light source 10a of the lighting device 10 rotates, so that the lighting device 10 changes the irradiation direction of the light and changes the part of the plant that is irradiated with the light. When changing the irradiation range of the light, for example, the lighting device 10 can vary the light distribution angle from a narrow angle to a wide angle by changing the position of the light distribution control lens relative to the light source 10a, etc.

[0020] The lighting device 10 includes a light source 10a having a white light emitting diode 11 that emits white light, and a red light emitting diode 12 that emits red light or a red phosphor.

[0021] The light source 10a irradiates the plants with white light and red light. The lighting device 10 is disposed on a ceiling, a wall, or the like in a position in which the lighting device 10 irradiates the plants with light. The lighting device 10 is disposed mainly at a position higher than the plants.

[0022] The light source 10a emits light having a Feeling of Contrast Index (FCI), an index indicating the vividness of color, of, for example, about 120. The FCI is based on 100. The light source 10a also emits at least white light and red light as light of two or more colors.

[0023] FIG. 3 is a diagram showing the spectrum of white light emitted by white light emitting diode 11, red light emitted by red light emitting diode 12, or red light emitted by a red phosphor in lighting system 1 according to embodiment 1.

[0024] 2 and 3, the white light emitted by the white light emitting diode 11 has a maximum peak wavelength in the blue region (blue light). The blue region is, for example, a wavelength region of light that humans can recognize as blue, for example, light with a wavelength of 430 nm to 490 nm. In the present embodiment, the color temperature of the white light is about 5000K.

[0025] The red light emitting diode 12 or red phosphor of the light source 10a emits monochromatic red light (red light). The red light emitting diode 12 of the light source 10a may emit red light by wavelength conversion of laser light to the red phosphor. The red light emitted by the red light emitting diode 12 or the red phosphor has peak wavelengths in the blue and red regions (red light), and has a maximum peak wavelength in the red region in particular. A narrow-band phosphor with a half-width of 50 nm or less is used as the red phosphor. Although FIG. 2 illustrates the red light emitting diode 12 as an example, it goes without saying that a red phosphor may be used.

[0026] The white light emitting diode 11 of the light source 10a is composed of a COB (Chip On Board) type LED element, and has a plurality of blue LEDs that are bare chips (LED chips) mounted on a substrate, and a sealing member that seals the blue LEDs and contains a yellow phosphor. The white light emitting diode 11 emits white light by combining blue light with light whose wavelength has been converted by the yellow phosphor. The white light emitting diode 11 of the light source 10a is an RGB three-color LED light source 10a, and may emit three monochromatic lights of red light, blue light, and green light, and may also emit white light obtained by dimming these three monochromatic lights.

[0027] The light source 10a may be a surface mount device (SMD) type LED element in which an LED is packaged, and may have a container (package), a plurality of LED chips mounted in the container, and a sealing member that seals the plurality of LED chips. The sealing member is a light-transmitting insulating resin material such as silicone resin. The sealing member may contain a light diffusing material such as silica and a filler dispersed therein.

[0028] [Control unit 20] 2, the control unit 20 has a dimming circuit and a color adjustment circuit for controlling an increase or decrease in the radiant energy emitted from the white light emitting diode 11 and the red light emitting diode 12 or the red phosphor. Specifically, the control unit 20 controls the current flowing through the white light emitting diode 11 and the red light emitting diode 12 and the number of light emitting diodes through which the current flows in order to control the radiant energy of the light to be irradiated to the plants.

[0029] 2 and 3, the control unit 20 controls the radiant energy of the red light emitted from the red light emitting diode 12 or the red phosphor to be equal to or less than half the radiant energy of the white light emitted from the white light emitting diode 11. This is to promote photosynthesis in plants and to suppress discoloration of plants, which occurs when the intensity of red light is too high compared to the intensity of white light in the light spectrum, making white plants look red and green plants look black. It is preferable that the control unit 20 controls the radiant energy of the red light to about half the radiant energy of the white light.

[0030] The control unit 20 controls at least one of the irradiation range, irradiation direction, and illuminance of the white light and the red light according to at least one of the size, shape, and growth stage of the plant.

[0031] The control unit 20 also acquires first information indicating at least one of the size, shape, and growth stage of the plant to be irradiated with the white light and the red light. That is, the control unit 20 acquires the first information indicating at least one of the size, shape, and growth stage of the plant by inputting the first information via the operation unit 40.

[0032] FIG. 4a is a schematic diagram showing how the lighting device 10 controls light distribution to change the illumination range and illuminance, and FIG. 4b is a schematic diagram showing how the lighting device 10 controls light distribution to change the illumination direction.

[0033] As shown in Fig. 2 and Fig. 4, for example, the control unit 20 controls the irradiation range and irradiation direction of the white light and red light (i.e., light) to irradiate the light to the growing point of the plant. The growing point is the crown part, the top part, and the vicinity thereof of the plant. The vicinity may be an area of ​​several percent of the height H of the plant based on the growing point. The control unit 20 may also perform control so that the light is irradiated to a part (also called the lower leaves) that is equal to or less than 1 / 2H of the height H of the plant.

[0034] The control unit 20 controls the irradiation range and irradiation direction of the light emitted by the lighting device 10, thereby irradiating the light to the growth point of the plant. That is, the control unit 20 controls the irradiation range of the light irradiated to the plant by controlling the light distribution angle of the light emitted by the lighting device 10. Specifically, the control unit 20 controls the irradiation range of the emitted light by adjusting the distance between the light distribution control lens mounted on the lighting device 10 and the light source 10a.

[0035] Furthermore, the control unit 20 controls the light irradiation direction by irradiating the light emitted by the lighting device 10 to the growth point of the plant. The irradiation direction is, for example, the optical axis direction of the light emitted by the lighting device 10, or the luminous intensity direction of the maximum luminous intensity of the light emitted by the lighting device 10. Specifically, as shown in Fig. 4b, the control unit 20 controls the irradiation direction by adjusting the posture of the lighting device 10 as shown by the two-dot chain line and solid line by driving and controlling an actuator (not shown). Furthermore, the irradiation direction may intersect the growth point of the plant, or may substantially intersect the growth point of the plant.

[0036] The control of the illumination range and illumination direction may be realized by manually replacing a light distribution control lens of the illumination device 10 or by manually adjusting the illumination direction of the illumination device 10.

[0037] The control unit 20 has a first mode, a second mode, a third mode, a fourth mode, and a fifth mode.

[0038] The first mode is a mode that can be expected to have an effect of promoting plant growth by irradiating light to the growth point of the plant. In the first mode for promoting plant growth, the control unit 20 controls the illuminance of the light emitted by the lighting device 10 to irradiate the growth point of the plant with white light and red light of 1200 lx or more. The upper limit of the illuminance irradiated to the growth point of the plant is, for example, about 10000 lx.

[0039] The second mode is a mode that is expected to have the effect of maintaining the vigor of the plant by irradiating the growth point of the plant with light. In the second mode for maintaining the vigor of the plant, the control unit 20 controls the illuminance of the light emitted by the lighting device 10 to irradiate the growth point of the plant with white light and red light of 600 lx or more and 1000 lx or less.

[0040] The third mode is a mode that is expected to have the effect of maintaining the vigor of the plant and suppressing the occurrence of leaf fall by irradiating light to a portion of the plant that is equal to or less than ½ of the plant's height H. In the third mode for maintaining the vigor of the plant, the control unit 20 controls the irradiation range and irradiation direction of the white light and red light emitted by the lighting device 10 to irradiate the white light and red light to a portion of the plant that is equal to or less than ½ of the plant's height H.

[0041] FIG. 5A is a schematic diagram showing how the lighting device 10 controls light distribution to irradiate 1200 lx light onto the growing point and 600 lx light onto the lower leaves of the plant, and FIG. 5B is a schematic diagram showing how the lighting device 10 controls light distribution to irradiate 600 lx to 1000 lx light onto the growing point and 600 lx light onto the lower leaves of the plant.

[0042] The fourth mode is a mode that is expected to promote plant growth like the first mode, while suppressing leaf drop like the third mode. In the fourth mode, which simultaneously executes both the first and third modes, the control unit 20 controls the irradiation range, irradiation direction, and illuminance of the white light and red light emitted by the lighting device 10 to irradiate the growth point of the plant with white light and red light of 1200 lx or more, and to irradiate a portion of the plant that is 1 / 2 or less of the height H of the back of the plant with white light and red light of 600 lx or more, which is less than the illuminance irradiated to the growth point of the plant.

[0043] The fifth mode is a mode that is expected to maintain the vigor of the plant and suppress the occurrence of leaf fall by irradiating the growth point of the plant with light and also irradiating a portion of the plant that is equal to or less than ½ of the plant's height H. As the fifth mode for maintaining the vigor of the plant and suppressing the occurrence of leaf fall, the control unit 20 controls the irradiation range, irradiation direction, and illuminance of the white light and red light emitted by the lighting device 10 to irradiate the growth point of the plant with white light and red light of 600 lx or more and 1000 lx or less, and to irradiate a portion of the plant that is equal to or less than ½ of the plant's height with white light and red light of 600 lx or more.

[0044] In this way, in the fourth and fifth modes, light is irradiated onto the range from the upper leaves to the lower leaves of the plant.

[0045] 2, the control unit 20 has one or more timer units 21. Each timer unit 21 corresponds to one or more lighting devices 10, and is a timer for controlling the lighting time of each lighting device 10. For example, when a predetermined time has elapsed, the timer unit 21 turns on or off the corresponding lighting device 10, or changes the illuminance to a preset value.

[0046] Moreover, the control unit 20 reads out the lighting schedule stored in the storage unit 30, and controls each of the lighting devices 10 in accordance with the lighting schedule.

[0047] [Storage section 30] The storage unit 30 stores a lighting schedule for turning on or off each of the lighting devices 10. The storage unit 30 also stores first information indicating at least one of the size, shape, and growth stage of the plant to be irradiated with light. The storage unit 30 is configured with a HDD (Hard Disk Drive), a semiconductor memory, or the like.

[0048] [Operation unit 40] The operation unit 40 controls the operation of each lighting device 10 via the control unit 20. The operation unit 40 receives input by a user's operation or an input from an external device other than the lighting system 1, and outputs an instruction according to the received input to the control unit 20. In other words, the operation unit 40 controls the operation of each lighting device 10 according to the received input.

[0049] The operation unit 40 may be a sensor such as an imaging device that captures an image of a plant to obtain information indicating at least one of the size, shape, and growth stage of the plant, or may be an operation terminal that obtains information through input by a user's operation.

[0050] [Power supply section 50] The power supply unit 50 is a power supply module having a lighting circuit that supplies power for lighting the lighting device 10. The power supply unit 50 converts AC current supplied from an external power source such as a commercial power source via a ceiling hook and an adapter into DC power of a predetermined level by rectifying, smoothing, stepping down, etc. The power supply unit 50 supplies the converted DC current to the lighting device 10 via a lead wire, etc. The power supply unit 50 may be combined with a dimming circuit, a boost circuit, etc. The power supply unit 50 may be mounted on the lighting device 10, in which case the power supply unit 50 of the present embodiment may not supply power to the lighting device 10.

[0051] <Experimental Results> The following are the results of an experiment evaluating the plant growth, plant vigor maintenance effect, and total number of fallen leaves when the first, second, and third lights were irradiated on the plant. In this experiment, a jasmine plant with a height of 1m was used.

[0052] The first lighting is a case where the light of the base lighting by the normal lighting device 10 installed indoors is irradiated to the plant, regardless of the light irradiation method for plant growth, the lighting device 10, and the lighting system 1 of the present embodiment. The second lighting is a case where the fourth mode is further executed on the base lighting. That is, the second lighting is a case where, in addition to the irradiation of the light by the base lighting, the growth point of the plant is irradiated with 1200lx white light and red light, and the part of the plant that is 1 / 2 or less in height is irradiated with 600lx white light and red light. The third lighting is a case where the fifth mode is further executed on the base lighting. That is, in addition to the irradiation of the light by the base lighting, the third lighting is a case where, in addition to the irradiation of the light by the base lighting, the growth point of the plant is irradiated with 600lx or more and 1000lx or less white light and red light, and the part of the plant that is 1 / 2 or less in height is irradiated with 600lx white light and red light.

[0053] The experimental results under these conditions are shown in FIG.

[0054] Fig. 6 is a diagram showing the relationship between the elongation of a plant and the number of days when the lighting device 10 of the lighting system 1 according to the embodiment 1 irradiates the plant with light. In Fig. 6, the horizontal axis indicates the number of days (hours) that the plant is irradiated with light, and the vertical axis indicates the elongation of the plant when the plant is irradiated with light. The case of the first lighting is indicated by a solid line, the case of the second lighting is indicated by a dashed line, and the case of the third lighting is indicated by a dashed line.

[0055] In Figure 6, it was found that the second lighting had the greatest effect on plant growth compared to the first and third lighting, and the plants grew taller as the days passed. It was also found that the growth of the plants was not significantly different between the first and third lighting, and the plants grew taller as the days passed, but this was not as noticeable as when the plants were illuminated with the second lighting.

[0056] Fig. 7 is a diagram showing the relationship between the number of fallen leaves of a plant and the number of days when the lighting device 10 of the lighting system 1 according to embodiment 1 irradiates the plant with light. In Fig. 7, the horizontal axis represents the number of days when the plant is irradiated with light, and the vertical axis represents the total number of fallen leaves when the plant is irradiated with light.

[0057] In Figure 7, it was found that the total number of fallen leaves was greater under lighting No. 1 than under lighting No. 2 and No. 3. It was also found that the number of fallen leaves did not increase significantly over time under lighting No. 2 and No. 3.

[0058] <Processing> Hereinafter, a light irradiation method for growing a plant, the lighting device 10, and the lighting system 1 according to the present embodiment will be described.

[0059] FIG. 8 is a flowchart showing the processing of the lighting system 1 according to the first embodiment.

[0060] First, the control unit 20 of the lighting system 1 acquires first information indicating at least one of the size, shape, and growth stage of a plant to be irradiated with light (S11), as shown in Fig. 8. The first information is stored in the storage unit 30, for example.

[0061] Next, the control unit 20 determines the irradiation range, irradiation direction, and illuminance of the light emitted by the lighting device 10 according to at least one of the size, shape, and growth stage of the plant indicated in the first information (S12). For example, the control unit 20 determines the irradiation range, irradiation direction, and illuminance of the light by reading a table stored in the storage unit 30, that is, the control unit 20 determines the mode for controlling the lighting device 10 from among the first mode to the fifth mode. In the table, modes corresponding to the irradiation range, irradiation direction, and illuminance of the light corresponding to at least one of the size, shape, and growth stage of the plant are set in advance.

[0062] Next, the control unit 20 controls the lighting device 10 according to the determined mode (S13). As a result, the lighting device 10 irradiates the target plant with light having an irradiation range, irradiation direction, and illuminance according to the determined mode. Then, the control unit 20 ends the process.

[0063] <Action and effect> Next, the effects of the light irradiation method for plant growth, the lighting device 10, and the lighting system 1 in the present embodiment will be described.

[0064] As described above, the light irradiation method for plant growth in this embodiment includes using white light-emitting diode 11 that emits white light and red light or a red phosphor that emits red light to irradiate white light and red light to a plant, controlling the radiant energy of the red light emitted from red light-emitting diode 12 or red phosphor to be half or less of the radiant energy of the white light emitted from white light-emitting diode 11, and controlling at least one of the irradiation range, irradiation direction, and illuminance of the white light and red light according to at least one of the size, shape, and growth stage of the plant.

[0065] According to this method, since the plant can be irradiated with red light, which is effective for plant photosynthesis and flower bud formation, light irradiation can be performed that is more effective for plant growth and maintaining plant vigor than when the plant is irradiated with only white light. In other words, the light irradiation method for plant growth can bring the plant into a desired state.

[0066] In addition, by setting the radiant energy of red light to half or less that of white light, the plant does not appear reddish when viewed by humans. In other words, the light irradiation method for plant growth is unlikely to impair the appearance of the plant.

[0067] Therefore, according to this light irradiation method for growing plants, it is possible to grow plants, maintain their vigor, and improve the appearance of the plants.

[0068] Furthermore, lighting device 10 in this embodiment includes light source 10a having white light-emitting diode 11 that emits white light and red light-emitting diode 12 or a red phosphor that emits red light, and irradiating white light and red light to plants, and control unit 20 that controls the radiant energy of the red light emitted from red light-emitting diode 12 or red phosphor to be half or less of the radiant energy of the white light emitted from white light-emitting diode 11, and controls at least one of the irradiation range, irradiation direction, and illuminance of the white light and red light in accordance with at least one of the size, shape, and growth stage of the plant.

[0069] This lighting device 10 also provides the same effects as the above-mentioned light irradiation method for plant growth.

[0070] Furthermore, the lighting system 1 in this embodiment includes a lighting device 10 having a white light-emitting diode 11 that emits white light and a red light-emitting diode 12 or a red phosphor that emits red light, and irradiating the white light and red light to plants, and a control unit 20 that controls the radiant energy of the red light emitted from the red light-emitting diode 12 or the red phosphor to be half or less of the radiant energy of the white light emitted from the white light-emitting diode 11, and controls at least one of the irradiation range, irradiation direction and illuminance of the white light and the red light in accordance with at least one of the size, shape and growth stage of the plant.

[0071] This lighting system 1 also provides the same effects as the above-mentioned light irradiation method for growing plants.

[0072] Moreover, the light irradiation method for plant growth in the present embodiment controls the irradiation range and irradiation direction of the white light and the red light to irradiate the growth point of the plant with the white light and the red light.

[0073] This can promote plant growth and allow the plant to reach a desired state.

[0074] Furthermore, in the lighting device 10 of the present embodiment, the control unit 20 controls the irradiation range and irradiation direction of the white light and the red light to irradiate the white light and the red light onto the growing point of the plant.

[0075] This lighting device 10 also provides the same effects as the above-mentioned light irradiation method for plant growth.

[0076] In addition, in the light irradiation method for plant growth in this embodiment, the irradiation range and irradiation direction of the white light and red light are controlled to irradiate a portion of the plant that is half or less of its height.

[0077] This makes it easier to maintain the plant in a desired state by maintaining its vigor, so that the plant's viewing period (the period during which it looks good) can be extended. In addition, it is possible to suppress the plant from losing its leaves.

[0078] In addition, the light irradiation method for plant growth in this embodiment irradiates the growth point of the plant with white light and red light of 1200 lx or more, and irradiates a portion of the plant up to half its height with white light and red light of 600 lx or more, which is lower in illuminance than the white light and red light irradiated to the growth point of the plant.

[0079] This can promote plant growth and inhibit the occurrence of defoliation, which in turn inhibits the plant's appearance from being marred by defoliation and reduces the need to clean up defoliation more frequently.

[0080] In addition, the light irradiation method for plant growth in this embodiment irradiates the growth point of the plant with white light and red light of 600 lx or more and 1000 lx or less, and irradiates a portion of the plant up to half its height with white light and red light of 600x or more.

[0081] This makes it possible to suppress the occurrence of defoliation while maintaining the vigor of the plant, which makes it easier to maintain the plant in a desired state and extends the plant's viewing period (the period during which it looks good).

[0082] In addition, the light irradiation method for plant growth in this embodiment irradiates the growth point of the plant with white light and red light of 1200 lx or more when promoting plant growth, and irradiates the plant with white light and red light when maintaining plant vigor, irradiates the growth point of the plant with white light and red light of 600 lx or more and 1000 lx or less, and irradiates a portion of the plant that is half or less of its height with white light and red light.

[0083] This allows plants to be encouraged to grow and maintain their vigor at the desired timing, making it easier to maintain the plant in the desired condition and lengthening the plant's viewing period (the period during which it looks good).

[0084] (Embodiment 2) <Configuration> The light irradiation method for plant growth, the configuration of the lighting device 10, and the lighting system 1 in the present embodiment will be described.

[0085] Fig. 9A is a schematic diagram showing how the lighting devices 10 of the lighting system 1 according to embodiment 2 are arranged above and below a plant and how the lighting device 10 looks when the lighting device 10 on the upper side shines light on the plant, and how the lighting device 10 on the lower side shines light on the plant.

[0086] This embodiment differs from the first embodiment in that a plurality of lighting devices 10 is used.

[0087] Other configurations in this embodiment are similar to those in the first embodiment unless otherwise specified, and the same configurations are given the same reference numerals and detailed description of the configurations is omitted.

[0088] In this embodiment, as shown in FIGS. 2, 9A, and 9B, a first lighting device 10b1, which is a lighting device 10, is arranged at a position higher than the plant, and a second lighting device 10b2, which is a lighting device 10, is arranged at a position equal to or less than 1 / 2 the height H of the plant.

[0089] The first lighting device 10b1 is disposed in a position where it irradiates the plant with white light and red light from above to below. Specifically, the first lighting device 10b1 is disposed in a position where the irradiation direction of the irradiated white light and red light forms an angle θ of 25° to 60° with respect to the horizontal direction. The first lighting device 10b1 is supported by, for example, a ceiling, a wall, a stand, etc.

[0090] The second lighting device 10b2 is disposed in a position where it irradiates the plant with white light and red light from below to above. Specifically, the second lighting device 10b2 is disposed in a position where the irradiation direction of the irradiated white light and red light forms an angle θ of 30° to 70° with respect to the horizontal direction. The second lighting device 10b2 is supported by, for example, a floor, a wall, etc.

[0091] In this way, the light is irradiated from above and below the plant, so that the light is irradiated even to the leaves located deep inside the plant. In other words, the light is irradiated even to the leaves located deep inside the plant. Also, as shown in FIG. 9B, because the light is irradiated to each leaf of the plant, the light is reflected by each leaf, making the whole plant appear to be shining.

[0092] The control unit 20 controls the first lighting device 10b1 and the second lighting device 10b2 to change the irradiation directions of the white light and the red light according to the size and shape of the plant.

[0093] Furthermore, the control unit 20 uses the first lighting device 10b1 and the second lighting device 10b2 to control the illuminance and turning on / off of the white light and red light that are irradiated onto the plants.

[0094] <Experimental Results> The following are the results of an experiment evaluating plant growth, plant vigor maintenance effect, total number of fallen leaves, and photosynthetic sensitivity when light is irradiated to the growing point and lower leaves of the plant. In this experiment, jasmine plants with a height H of 1m were used as plants, and the illuminance was changed from 300lx to 1500lx and the plants were grown for 30 days. In addition, a Meiwafosis measuring device (LI-6400XT) was used as a means to measure the photosynthetic sensitivity. The photosynthetic sensitivity was calculated as the average of 20 leaves.

[0095] 10 is a diagram showing the relationship between plant elongation and illuminance, the relationship between the number of fallen leaves and illuminance, and the relationship between photosynthetic sensitivity and illuminance when the first lighting device 10b1 of the lighting system 1 according to embodiment 2 irradiates light to a growing point of a plant. FIG. 10 shows the case where light is irradiated to a growing point. In FIG. 10, the horizontal axis is the illuminance of light irradiated to the plant, the vertical axis (corresponding to the solid line) is the grown length of the plant (elongation in cm), the vertical axis (corresponding to the dashed lines with small intervals) is the total number of fallen leaves of the plant, and the vertical axis (corresponding to the dashed lines with large intervals) is the photosynthetic sensitivity of the plant (μmol CO 2 m -2 s -1 ).

[0096] It was found that the higher the illuminance applied to the plant, the greater the plant's growth, and therefore that it has the effect of promoting plant growth. It was also found that the total number of fallen leaves from the plant decreased as the illuminance increased, with the total number of fallen leaves at illuminances of 600lx or more being dramatically lower than the total number of fallen leaves at illuminances of less than 600lx. It was also found that the higher the illuminance, the higher the photosynthetic sensitivity of the plant.

[0097] In particular, at illuminance levels of 600lx to 1000lx (illuminance for maintaining plant vigor), plant growth slowed, fewer leaves fell, and the rate of increase in photosynthetic sensitivity was slower than at illuminance levels below 600lx, indicating that this has an effect on maintaining plant vigor.

[0098] In addition, it was found that at an illuminance of 1200lx or more (growth illuminance), plants grew faster, there was less leaf fall, and the photosynthetic sensitivity was higher than at illuminances below 1200lx, which was effective in promoting plant growth.

[0099] 11 is a diagram showing the relationship between plant elongation and illuminance, the relationship between the number of fallen leaves and illuminance, and the relationship between photosynthetic sensitivity and illuminance when the second lighting device 10b2 of the lighting system 1 according to embodiment 2 irradiates light to the lower leaves of the plant. FIG. 11 shows the case where light is irradiated to the lower leaves. The scale of the vertical axis in FIG. 11 is the same as that of FIG. 10. In FIG. 11, the horizontal axis is the illuminance of light irradiated to the plant, the vertical axis (corresponding to the solid line) is the grown length of the plant (elongation in cm), the vertical axis (corresponding to the dashed lines with small intervals) is the total number of fallen leaves of the plant, and the vertical axis (corresponding to the dashed lines with large intervals) is the photosynthetic sensitivity of the plant (μmol CO 2 m -2 s -1 ).

[0100] It was found that the higher the illuminance applied to the plant, the slightly greater the plant's growth. When light was applied to the lower leaves, it did not have the same effect on plant growth as when light was applied to the plant's growing point, but it was found that the plant's vigor was maintained. In addition, the total number of fallen leaves from the plant also decreased as the illuminance increased, and the total number of fallen leaves at an illuminance of 600lx or more was more drastic than the total number of fallen leaves at an illuminance of less than 600lx. It was also found that the higher the illuminance, the higher the photosynthetic sensitivity of the plant. However, when light was applied to the lower leaves, the effect of increasing photosynthetic sensitivity was more gradual than when light was applied to the plant's growing point, and it was found to have the effect of maintaining the plant's vigor.

[0101] <Action and effect> Next, the effects of the light irradiation method for plant growth, the lighting device 10, and the lighting system 1 in the present embodiment will be described.

[0102] As described above, the light irradiation method for plant growth in this embodiment changes the irradiation direction of white light and red light depending on the size and shape of the plant. When lighting device 10 having white light emitting diode 11 and red light emitting diode 12 or red phosphor is placed at a position higher than the plant, the irradiation direction of the white light and red light emitted by lighting device 10 forms an angle of 25° to 60° with respect to the horizontal direction, and when lighting device 10 is placed at a position equal to or less than 1 / 2 the height of the plant, the irradiation direction of the white light and red light emitted by lighting device 10 forms an angle of 30° to 70° with respect to the horizontal direction.

[0103] According to this, by irradiating the plant with light from above and below, it is possible to irradiate the leaves deep inside the plant with light. In other words, the leaves deep inside the plant can easily perform photosynthesis, so that the occurrence of defoliation can be suppressed. Also, as shown in FIG. 9B, since light is irradiated to each leaf of the plant, the light is reflected by each leaf, so that the whole plant looks like it is shining, which improves the appearance.

[0104] In addition, the light irradiation method for plant growth in this embodiment uses a plurality of lighting devices 10 arranged at a position higher than the plant and at a position equal to or less than half the height of the plant, and controls the illuminance and on / off of the white light and red light irradiated to the plant.

[0105] According to this, by irradiating the plant with light from above and below the plant, it is possible to cause the plant to carry out photosynthesis efficiently.

[0106] In addition, it is possible to control the turning on and off of the lighting device 10 and the illuminance of the light emitted by the lighting device 10. This makes it possible to efficiently grow plants and maintain their vigor, while also improving the appearance of the plants.

[0107] In this embodiment as well, the same effects as those of the first embodiment are achieved.

[0108] (Embodiment 3) <Configuration> The configuration of a lighting system 1a according to the present embodiment will be described.

[0109] FIG. 12 is a block diagram of a lighting system 1a according to the third embodiment.

[0110] As shown in FIG. 12, the present embodiment differs from the first embodiment in that it has a first detection unit 61 and a second detection unit 62 for detecting the state of the plant.

[0111] Other configurations in this embodiment are similar to those in the first embodiment unless otherwise specified, and the same configurations are given the same reference numerals and detailed description of the configurations is omitted.

[0112] The lighting system 1a includes one or more lighting devices 10, a control unit 20, a storage unit 30, an operation unit 40, a power supply unit 50, as well as a first detection unit 61 and a second detection unit 62.

[0113] The first detection unit 61 detects the state of the plant to obtain first information indicating at least one of the size, shape, and growth stage of the plant. The first detection unit 61 is, for example, an imaging device, a brightness sensor, etc., and recognizes at least one of the size, shape, and growth stage of the plant by imaging the plant, and obtains the first information indicating at least one of the size, shape, and growth stage of the plant. The first detection unit 61 outputs the detected first information to the control unit 20. The first detection unit 61 is an example of a detection unit.

[0114] The second detection unit 62 obtains second information indicating the photosynthetic sensitivity of the plant due to the light irradiated by the lighting device 10. The second detection unit 62 is, for example, a photosynthetic sensor that measures the intensity of chlorophyll fluorescence of the plant. The second detection unit 62 outputs the detected second information to the control unit 20.

[0115] The control unit 20 controls at least one of the light distribution, the irradiation direction, and the illuminance of the white light and the red light to be irradiated to the plant, based on the acquired first information and second information.

[0116] For example, the control unit 20 can determine whether or not the plant is growing based on the first information. If the control unit 20 determines that the plant is growing, the control unit 20 executes the third mode, the third mode, or the fifth mode to maintain the vigor of the plant. If the control unit 20 determines that the plant is not growing based on the first information, the control unit 20 executes the first mode or the fourth mode to promote the plant growth.

[0117] Furthermore, the control unit 20 can determine whether the degree of photosynthesis of the plant is greater than a predetermined value based on the second information. When the degree of photosynthesis of the plant is greater than the predetermined value, the control unit 20 executes the third mode or the fifth mode if it is desired to maintain the vigor of the plant, and executes the first mode or the fourth mode or executes the current control process if it is desired to promote the growth of the plant. When the degree of photosynthesis of the plant is less than the predetermined value, the control unit 20 executes the second mode, the third mode, or the fifth mode if it is desired to maintain the vigor of the plant, and executes the first mode or the fourth mode if it is desired to promote the growth of the plant.

[0118] <Processing> The light irradiation method for growing plants, the lighting device 10, and the lighting system 1a according to the present embodiment will be described below.

[0119] FIG. 13 is a flowchart showing the processing of the lighting system 1a according to the third embodiment.

[0120] First, as shown in Fig. 13, the first detection unit 61 detects the state of the plant. That is, the first detection unit 61 detects at least one of the size, shape, and growth stage of the plant to obtain first information indicating at least one of the size, shape, and growth stage of the plant (S21). The first detection unit 61 outputs the detected first information to the control unit 20. Then, from step S12 onwards, the same process as in Fig. 8 is performed.

[0121] <Experimental Results> The following are the results of an experiment evaluating plant growth, vigor maintenance, total number of fallen leaves, and photosynthetic sensitivity when light was irradiated to the growing point and lower leaves of the plant. In this experiment, a jasmine plant with a height of 1 m was used as the plant, and light was irradiated by changing the irradiation angle of the optical axis of the lighting device 10 relative to the horizontal plane from 0° to 80°. In addition, a measuring device from Meiwafosis (LI-6400XT) was used as a means for measuring photosynthetic sensitivity, and a measuring device from Komica Minolta (CA-2500) was used as a means for measuring luminance. The photosynthetic sensitivity was calculated as the average of 20 leaves.

[0122] FIG. 14 is a diagram showing the relationship between the photosynthetic sensitivity and the irradiation angle, and the relationship between the luminance and the irradiation angle when the first lighting device 10b1 on the upper side irradiates light onto a plant.

[0123] In Fig. 14, the plant was irradiated with light using a first lighting device 10b1 placed at a position higher than the plant. In Fig. 14, the horizontal axis represents the irradiation angle of the optical axis of the first lighting device 10b1 with respect to the horizontal plane when the plant was irradiated with light from above to below, and the left vertical axis (corresponding to the solid line) represents the photosynthetic sensitivity of the plant (μmol CO 2 m -2 s -1 ) and the right vertical axis (corresponding to the dashed line) is luminance (cd / m 2 ).

[0124] For both the solid and dashed lines, it was found that the photosynthetic sensitivity and luminance increased when the irradiation angle was 20° to 70°. In particular, it was found that the photosynthetic sensitivity and luminance were high when the irradiation angle was 25° to 60°.

[0125] FIG. 15 is a diagram showing the relationship between the photosynthetic sensitivity and the irradiation angle, and the relationship between the luminance and the irradiation angle when the second lower illuminator 10b2 irradiates light onto a plant.

[0126] In Fig. 15, the plant was irradiated with light using the second lighting device 10b2 placed at a position equal to or less than half the height of the plant. In Fig. 15, the horizontal axis represents the irradiation angle of the optical axis of the second lighting device 10b2 with respect to the horizontal plane when the plant was irradiated with light from below to above, and the vertical axis on the left (corresponding to the solid line) represents the photosynthetic sensitivity of the plant (μmol CO 2 m -2 s -1 ), and the vertical axis on the right (corresponding to the dashed line) is luminance (cd / m 2 ).

[0127] For both the solid and dashed lines, it was found that the photosynthetic sensitivity and luminance increased when the irradiation angle was 25° to 75°. In particular, it was found that the photosynthetic sensitivity and luminance were high when the irradiation angle was 30° to 70°.

[0128] <Action and effect> Next, the effects of the lighting system 1a according to the present embodiment will be described.

[0129] As described above, the lighting system 1a in this embodiment further includes the first detection unit 61 that detects at least one of the size, shape, and growth stage of the plant. The control unit 20 acquires first information indicating at least one of the size, shape, and growth stage of the plant from the first detection unit 61, and controls at least one of the irradiation range, irradiation direction, and illuminance of the white light and red light irradiated to the plant based on the acquired first information.

[0130] This makes it possible to control at least one of the light distribution, irradiation direction, and illuminance of the white light and red light irradiated to the plant based on at least one of the plant's state, i.e., size, shape, and growth stage, thereby optimizing the appearance of the plant and optimizing the state of the plant by suppressing the load applied to the plant.

[0131] In this embodiment as well, the same effects as those of the first embodiment and the like are achieved.

[0132] (Other variations, etc.) Although the present disclosure has been described above based on the embodiments, the present disclosure is not limited to these embodiments.

[0133] For example, in the light irradiation methods for plant growth, the lighting devices, and the lighting systems according to the above-mentioned first to third embodiments, the control unit is provided as a device separate from the lighting device, but may be mounted on the lighting device.

[0134] Moreover, the light irradiation methods for plant cultivation according to the above-mentioned first to third embodiments are realized by a program using a computer, and such a program may be stored in a storage device.

[0135] Furthermore, each processing unit included in the light irradiation method for plant growth, the lighting device, and the lighting system according to the above-mentioned first to third embodiments is realized as an LSI, which is typically an integrated circuit. These may be individually implemented as single chips, or some or all of them may be included in a single chip.

[0136] The integrated circuit is not limited to an LSI, but may be realized by a dedicated circuit or a general-purpose processor. A field programmable gate array (FPGA) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connections and settings of the circuit cells inside the LSI may also be used.

[0137] In the above first to third embodiments, each component may be configured with dedicated hardware, or may be realized by executing a software program suitable for each component. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.

[0138] Furthermore, all the numbers used above are merely examples for the purpose of specifically explaining the present disclosure, and the embodiments of the present disclosure are not limited to the numbers exemplified.

[0139] In addition, the division of functional blocks in the block diagram is an example, and multiple functional blocks may be realized as one functional block, one functional block may be divided into multiple blocks, or some functions may be transferred to another functional block. Furthermore, the functions of multiple functional blocks having similar functions may be processed in parallel or in a time-sharing manner by a single piece of hardware or software.

[0140] In addition, the order in which each step is performed in the flowchart is merely for illustrative purposes and may be other than the above. In addition, some of the steps may be performed simultaneously (in parallel) with other steps.

[0141] In addition, the present disclosure also includes forms obtained by applying various modifications to embodiments 1 to 3 that would come to mind by a person skilled in the art, and forms realized by arbitrarily combining the components and functions of embodiments 1 to 3 without departing from the spirit of the present disclosure. [Explanation of symbols]

[0142] 1. 1a Lighting system 10. Lighting Equipment 10a light source 11 White light emitting diode 12 Red light emitting diode 20 Control section 61 First detection unit (detection unit)

Claims

1. A white light emitting diode that emits white light and a red light emitting diode or a red phosphor that emits red light are used to irradiate the white light and the red light to the plant; controlling the radiant energy of the red light emitted from the red light emitting diode or the red phosphor to be equal to or less than half the radiant energy of the white light emitted from the white light emitting diode; controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light according to at least one of a size, a shape, and a growth stage of the plant; by controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light, a mode for promoting growth of the plant and a mode for suppressing leaf loss of the plant are executed; executing at least one of a mode for maintaining the vigor of the plant and a mode for maintaining the vigor of the plant and suppressing defoliation of the plant by controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light; When executing a mode for promoting the growth of the plant, irradiating a growth point of the plant including a top portion of the plant with the white light and the red light at 1200 lx or more and less than 3000 lx; irradiating a growth point of the plant with the white light and the red light at 600 lx or more and 1000 lx or less when executing a mode for maintaining the vigor of the plant; When a mode for maintaining the vigor of the plant and suppressing the occurrence of defoliation in the plant is executed, the white light and the red light are irradiated onto a portion of the plant that is equal to or less than ½ of the height H of the plant. A method of applying light to grow plants.

2. The white light and the red light are irradiated to a part of the plant that is equal to or less than half of the height of the plant by controlling an irradiation range and an irradiation direction of the white light and the red light. Irradiating the growing point of the plant with the white light and the red light at 1200 lx or more; and irradiating a portion of the plant that is equal to or less than ½ of the height of the plant with the white light and the red light having an illuminance of 600 lx or more, which is lower than the illuminance of the white light and the red light irradiated to the growing point of the plant. The light irradiation method for plant growth according to claim 1.

3. Irradiating the white light and the red light at 600 lx or more and 1000 lx or less to the growth point of the plant, and irradiating a portion of the plant that is equal to or less than ½ of its height with the white light and the red light at 600 lx or more. The light irradiation method for plant growth according to claim 1 or 2.

4. The white light and the red light are irradiated to a growing point of the plant by controlling an irradiation range and an irradiation direction of the white light and the red light. The light irradiation method for plant growth according to any one of claims 1 to 3.

5. Irradiating the white light and the red light at 600 lx or more and 1000 lx or less to the growth point of the plant, The white light and the red light are irradiated at 600 lx or more to a portion of the plant that is equal to or less than half of the plant's height. The light irradiation method for plant growth according to any one of claims 1 to 4.

6. When promoting the growth of the plant, the white light and the red light are irradiated at a growth point of the plant with 1200 lx or more of the white light and the red light, When maintaining the vigor of the plant, Irradiating the plant with the white light and the red light; The white light and the red light are irradiated at 600 lx or more and 1000 lx or less to a growth point of the plant, and the white light and the red light are irradiated to a portion of the plant that is equal to or less than 1 / 2 of the height of the plant. The light irradiation method for plant growth according to any one of claims 2 to 4.

7. changing the irradiation direction of the white light and the red light according to the size and shape of the plant; When a lighting device having the white light emitting diode and the red light emitting diode or the red phosphor is placed at a position higher than the plant, the irradiation direction of the white light and the red light emitted by the lighting device is at an angle of 25° to 60° with respect to the horizontal direction; When the lighting device is placed at a position equal to or less than half the height of the plant, the irradiation direction of the white light and the red light emitted by the lighting device is at an angle of 30° to 70° with respect to the horizontal direction. The light irradiation method for plant growth according to any one of claims 1 to 6.

8. In order to grow the plant and maintain its vigor, a plurality of the lighting devices are disposed at a position higher than the plant and at a position equal to or lower than 1 / 2 the height of the plant, and the illuminance of the white light and the red light irradiated to the plant is controlled to be 600 lx or more, and the turning on and off of the white light and the red light irradiated to the plant is controlled. The light irradiation method for plant growth according to claim 7.

9. a light source having a white light emitting diode that emits white light and a red light emitting diode or a red phosphor that emits red light, the light source irradiating the white light and the red light to a plant; a control unit that controls the radiant energy of the red light emitted from the red light emitting diode or the red phosphor to be half or less of the radiant energy of the white light emitted from the white light emitting diode, and controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light in accordance with at least one of a size, a shape, and a growth stage of the plant, The control unit is by controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light, a mode for promoting growth of the plant and a mode for suppressing leaf loss of the plant are executed; by controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light, at least one of a mode for maintaining the vigor of the plant and a mode for maintaining the vigor of the plant and suppressing defoliation of the plant is executed; The light source is When executing a mode for promoting the growth of the plant, the white light and the red light are irradiated at 1200 lx or more and less than 3000 lx to a growth point of the plant including a top part of the plant, When executing a mode for maintaining the vigor of the plant, the white light and the red light are irradiated to a growth point of the plant with light of 600 lx or more and 1000 lx or less; When a mode for maintaining the vigor of the plant and suppressing the occurrence of defoliation in the plant is executed, the white light and the red light are irradiated onto a portion of the plant that is equal to or less than ½ of the height H of the plant. Lighting equipment.

10. The control unit controls the irradiation range and irradiation direction of the white light and the red light, so that the light source irradiates the white light and the red light to a portion of the plant that is equal to or less than half of its height, The light source is Irradiating the growing point of the plant with the white light and the red light at 1200 lx or more; The white light and the red light are irradiated to a portion of the plant that is equal to or less than 1 / 2 of the height of the plant, with an illuminance of 600 lx or more, which is smaller than the illuminance of the white light and the red light irradiated to the growth point of the plant.

10. The lighting device according to claim 9.

11. The light source is Irradiating the white light and the red light at 600 lx or more and 1000 lx or less to the growth point of the plant, The white light and the red light are irradiated at 600 lx or more to a portion of the plant that is equal to or less than half of the plant's height.

11. An illumination device according to claim 9 or 10.

12. The control unit controls an irradiation range and an irradiation direction of the white light and the red light to irradiate the white light and the red light to a growth point of the plant. The lighting device according to any one of claims 9 to 11.

13. A lighting device having a white light emitting diode that emits white light and a red light emitting diode or a red phosphor that emits red light, the lighting device irradiating the white light and the red light to a plant; a control unit that controls the radiant energy of the red light emitted from the red light emitting diode or the red phosphor to be half or less of the radiant energy of the white light emitted from the white light emitting diode, and controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light in accordance with at least one of a size, a shape, and a growth stage of the plant, The control unit is by controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light, a mode for promoting growth of the plant and a mode for suppressing leaf loss of the plant are executed; by controlling at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light, at least one of a mode for maintaining the vigor of the plant and a mode for maintaining the vigor of the plant and suppressing defoliation of the plant is executed; The lighting device includes: When executing a mode for promoting the growth of the plant, the white light and the red light are irradiated at 1200 lx or more and less than 3000 lx to a growth point of the plant including a top part of the plant, When executing a mode for maintaining the vigor of the plant, the white light and the red light are irradiated to a growth point of the plant with light of 600 lx or more and 1000 lx or less; When a mode for maintaining the vigor of the plant and suppressing the occurrence of defoliation in the plant is executed, the white light and the red light are irradiated onto a portion of the plant that is equal to or less than ½ of the height H of the plant. Lighting system.

14. The control unit controls an irradiation range and an irradiation direction of the white light and the red light, so that the lighting device irradiates the white light and the red light to a portion of the plant that is equal to or less than half of the height of the plant, The lighting device includes: Irradiating the growing point of the plant with the white light and the red light at 1200 lx or more; The white light and the red light are irradiated to a portion of the plant that is equal to or less than 1 / 2 of the height of the plant, with an illuminance of 600 lx or more, which is smaller than the illuminance of the white light and the red light irradiated to the growth point of the plant.

14. The lighting system of claim 13.

15. The lighting device includes: Irradiating the white light and the red light at 600 lx or more and 1000 lx or less to the growth point of the plant, The white light and the red light are irradiated at 600 lx or more to a portion of the plant that is equal to or less than half of the plant's height.

15. A lighting system according to claim 13 or 14.

16. Further, a detection unit is provided that detects at least one of the size, shape, and growth stage of a plant, The control unit acquires information indicating at least one of a size, a shape, and a growth stage of the plant from the detection unit in order to optimize a state of the plant, and controls at least one of an irradiation range, an irradiation direction, and an illuminance of the white light and the red light to be irradiated to the plant based on the acquired information.

16. A lighting system according to any one of claims 13 to 15.

Images