Lighting device for plant cultivation

Abstract

A lighting device for plant cultivation, according to the present invention, comprises: LED assemblies each including an LED housing in which an LED substrate having a plurality of LED light sources for generating light is accommodated and which distributes the light of the plurality of LED light sources, and a heat dissipation fin having a lower end coupled to the LED housing; and blowing fans which are disposed over the LED assemblies and blow air downward. By using the blowing fans, the lighting device has the advantages of improved heat dissipation performance and usability as a hot air blower.

Description

Lighting devices for plant cultivation

[0001] The present invention relates to a lamp apparatus for cultivating plants, and more particularly, to a lamp apparatus for cultivating plants that maximizes the heat dissipation performance of an LED unit and can be used as a heater by utilizing the heat dissipated by the LED unit.

[0002]

[0003] In general, a smart farm is an intelligent agricultural system that integrates information and communication technology (ICT) into the production, processing, and distribution stages of agriculture, forestry, livestock, and aquatic products. It utilizes technologies such as the Internet of Things (IoT) to maintain and manage the environment and enable automatic management using smart devices.

[0004] These smart farm systems measure and display the temperature and humidity inside the cultivation facility, and use control devices that control cameras, pumps, various valves, heating devices, lighting devices, etc. to remotely monitor the cultivation facility while cultivating crops. Therefore, they are considered a technology that can improve agricultural competitiveness by managing a large number of cultivation facilities with minimal labor. Recently, smart farm technology has been actively supplied to cultivation housings for growing plants such as vegetables, thereby increasing mass production of plants and their growth rate.

[0005] In particular, artificial lighting is an important factor in the growth and development of plants (flowering, fruit set, etc.). Artificial lighting is applied to container-type smart farms where natural light is difficult to enter, thereby improving the efficiency of crop cultivation.

[0006] Republic of Korea Patent Publication No. 10-2024-0102212 (July 3, 2024) (hereinafter referred to as “prior art”) discloses a “smart farm vertical cultivation system” that cultivates plants using artificial lighting.

[0007] The above-mentioned conventional technology comprises a kit box installed inside a cultivation box to cultivate plants, a nutrient solution supply unit that supplies nutrient solution to the kit box, and a light module that irradiates a light source to the plants in the kit box, wherein the kit box has a growing space for the growth of plant roots and is installed inside the cultivation box so that the plant leaves face the light source module, and the nutrient solution supplied from the nutrient solution supply unit is sprayed as dry fog into the growing space through an ultrasonic generator and filled, thereby targeting the plant roots.

[0008] However, the above-mentioned conventional technology does not have a heater function that provides warm air to plants being grown in the cultivation box by using the heat of the light source module, so not only cannot directly provide warm air to the plants, but also has the problem that an expensive air conditioning system consisting of a compressor, a condenser, an expansion valve, and an evaporator must be separately installed in order to control the temperature inside the cultivation housing.

[0009]

[0010] The technical problem of the present invention is to provide a lighting device for plant cultivation that can be used as a heater and improves heat dissipation performance by using a blower fan.

[0011] The technical problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0012]

[0013] To achieve the above object, a lighting device for plant cultivation according to the present invention comprises an LED assembly and a blower fan. The LED assembly comprises an LED housing and heat dissipation fins. An LED substrate having a plurality of LED light sources that generate light is accommodated inside the LED housing. The LED housing distributes light from the plurality of LED light sources. The lower end of the heat dissipation fins is connected to the LED housing. The blower fan is positioned above the LED assembly and blows air downward.

[0014] A refrigerant flow space in which refrigerant flows can be formed inside the above heat dissipation fin.

[0015] The above heat dissipation fins may be formed of a material including stainless steel. The above coolant may be formed of water.

[0016] The LED substrate may have the plurality of LED light sources arranged in a longitudinal direction. The heat dissipation fins may be formed to have a length corresponding to the length of the LED substrate. A first pin coupling slot may be formed on the upper surface of the LED housing into which the lower portion of the heat dissipation fin is inserted.

[0017] The lower part of the above heat dissipation fin can be fixed to the LED housing through welding or epoxy while being inserted into the first pin coupling slot.

[0018] The LED housing may be composed of an LED housing cover and an LED housing body. The LED housing cover may allow light to pass through it. The LED housing body may be coupled to the LED housing cover. The lower portion of the heat dissipation fin may be coupled to the LED housing body. The LED housing body may be formed of a metal material that does not allow light to pass through it and transfers heat to the heat dissipation fin.

[0019] A pair of joining grooves may be formed on the lower surface of the LED housing body, into which the left and right sides of the LED housing cover are respectively inserted and joined.

[0020] At least a portion of the LED assembly may be disposed within a first housing. The first housing may have openings at the front and rear. The blower fan may be disposed within a second housing. The second housing may partially cover the open upper surface of the first housing.

[0021] A rim joining rib may be formed at the lower end of the second housing. The rim joining rib may be inserted into the opened upper surface of the first housing and joined to the inner peripheral edge of the upper end of the first housing.

[0022] The above LED assembly may be composed of a plurality of LED assemblies spaced apart from each other in the direction of both sides of the heat dissipation fin.

[0023] The above LED assembly may further include a heat dissipation guide. The heat dissipation guide may be coupled to the upper end of the heat dissipation fin. The heat dissipation guide may have a plurality of heat dissipation protrusions formed on both sides of the heat dissipation fin.

[0024] A heat dissipation tip portion having a circular cross-section and extending in the longitudinal direction of the heat dissipation guide may be formed at the upper end of the heat dissipation guide. The heat dissipation tip portion may be inserted and coupled into a tip portion coupling groove formed in the fan bracket. The fan bracket may support the blower fan.

[0025] The plurality of heat dissipation protrusions may be formed so as to be inclined toward the lower side as they go outward in the direction of both sides of the heat dissipation fin. The plurality of heat dissipation protrusions may extend in the longitudinal direction of the heat dissipation guide.

[0026] The above heat dissipation guide may be formed with a second pin coupling slot into which the upper part of the heat dissipation fin is inserted.

[0027] A first end plate may be arranged at one end of the LED assembly. An upper end of the first end plate may be fastened to one end of the heat dissipation tip portion via a spiral fastening member. A lower end of the first end plate may be fastened to one end of the LED housing via a spiral fastening member. A second end plate may be arranged at the other end of the LED assembly. An upper end of the second end plate may be fastened to the other end of the heat dissipation tip portion via a spiral fastening member. A lower end of the second end plate may be fastened to the other end of the LED housing via a spiral fastening member.

[0028] Specific details of other embodiments are included in the detailed description and drawings.

[0029]

[0030] The lighting device for plant cultivation according to the present invention can reduce the weight of the entire product because it includes an LED assembly in which the lower part of a heat dissipation fin is joined to an LED housing in which an LED substrate is accommodated inside, and because a blower fan placed on the upper side of the LED assembly blows air downward, it improves heat dissipation performance and has the effect of being able to be used as a heater.

[0031] In addition, the lighting device for plant cultivation according to the present invention has the effect of allowing easy replacement of only the LED assembly when some of the LED assemblies malfunction or break down, when the LED assembly is equipped with a plurality of LED assemblies.

[0032] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0033]

[0034] Figure 1 is a bottom perspective view showing a lighting device for plant cultivation according to the first embodiment of the present invention;

[0035] Figure 2 is a top perspective view of Figure 1 viewed from the rear.

[0036] Figure 3 is a drawing showing a state in which the first housing is removed from Figure 1;

[0037] Figure 4 is a drawing showing the state in which the distribution box is separated in Figure 1 and an enlarged view of a part thereof;

[0038] Figure 5 is a rear perspective view of Figure 4 and an enlarged view of a portion thereof;

[0039] Fig. 6 is a drawing showing the LED assembly shown in Fig. 3;

[0040] Figure 7 is an exploded perspective view of Figure 6;

[0041] Figure 8 is a drawing of Figure 7 viewed from above.

[0042] Figure 9 is a cross-sectional view of Figure 6;

[0043] Fig. 10 is an exploded perspective view of the heat dissipation fin shown in Fig. 6 and an enlarged view of a portion thereof.

[0044] Fig. 11 is a perspective view showing a lighting device for plant cultivation according to a second embodiment of the present invention.

[0045] Fig. 12 is a bottom perspective view of Fig. 11;

[0046] Fig. 13 is an exploded perspective view of Fig. 11 and an enlarged view of a portion thereof;

[0047] Fig. 14 is a rear perspective view of Fig. 13 and an enlarged view of a portion thereof;

[0048] Fig. 15 is a drawing showing the LED assembly shown in Fig. 13;

[0049] Figure 16 is an exploded perspective view of Figure 15;

[0050] Fig. 17 is a bottom perspective view of Fig. 16;

[0051] Fig. 18 is a drawing showing the front end of the LED unit illustrated in Fig. 16;

[0052] Fig. 19 is a bottom perspective view of Fig. 18;

[0053] Fig. 20 is a cross-sectional view showing the lower part of the LED assembly illustrated in Fig. 15;

[0054] Fig. 21 is a drawing showing the front end of the heat dissipation guider illustrated in Fig. 16;

[0055] Fig. 22 is a cross-sectional view showing the upper part of the LED assembly illustrated in Fig. 15;

[0056] Fig. 23 is a drawing showing the heat dissipation fins shown in Fig. 16 and an enlarged view of a part thereof;

[0057] Figure 24 is an exploded perspective view of Figure 23;

[0058] Fig. 25 is a drawing showing the first end plate illustrated in Fig. 13;

[0059] Fig. 26 is a drawing showing the second end plate illustrated in Fig. 13;

[0060] Figure 27 is a rear perspective view of Figure 26;

[0061] Figure 28 is an exploded perspective view of Figure 26;

[0062] Figure 29 is a rear perspective view of Figure 28.

[0063]

[0064] <Explanation of symbols>

[0065] 1, 2: Lighting device for plant cultivation 10: First housing

[0066] 20: Second housing 25: Border joining rib

[0067] 100: LED assembly 110: LED substrate

[0068] 115: LED light source 120: LED housing

[0069] 121: LED housing cover 121A: Joint plate

[0070] 122: LED housing body 122A: Joining groove

[0071] 122B: 1st pin bonding slot 130: Heat sink fin

[0072] 135: Refrigerant flow space 140: Heat dissipation guide

[0073] 141: Heat dissipation protrusion 142: Heat dissipation tip

[0074] 145: Second pin coupling slot 200: First end plate

[0075] 300: Second end plate 410: Blower fan

[0076] 420: Fan bracket 422: Tip joint groove

[0077]

[0078] Hereinafter, a lighting device for plant cultivation according to embodiments of the present invention will be described with reference to drawings.

[0079] When assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals whenever possible, even if they appear on different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of a related known configuration or function is deemed to hinder understanding of the embodiments of the present invention, the detailed description will be omitted.

[0080] In describing components of embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by these terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0081] FIG. 1 is a bottom perspective view showing a lighting device for plant cultivation according to a first embodiment of the present invention, FIG. 2 is a top perspective view looking from the rear of FIG. 1, and FIG. 3 is a drawing showing a state in which the first housing is removed from FIG. 1.

[0082] Hereinafter, in terms related to directions such as front, back, left, right, up, down in the description, the direction indicates the same direction as the front, back, left, right, up, down directions indicated by arrows in Figures 1 and 2.

[0083] Referring to FIGS. 1 to 3, a lighting device (1) for plant cultivation according to a first embodiment of the present invention may be a lighting device that functions to irradiate artificial light to plants grown within a cultivation housing. In addition, a lighting device (1) for plant cultivation according to an embodiment of the present invention may be a lighting device that functions to provide warm air to plants grown within the cultivation housing.

[0084] A lighting device (1) for plant cultivation according to a first embodiment of the present invention is connected to one of a horizontal transport module (not shown) and a vertical transport module (not shown) installed on the ceiling of the cultivation housing, and can be moved horizontally by the operation of the horizontal transport module and can be moved vertically by the operation of the vertical transport module. Here, the horizontal transport module and the vertical transport module can be connected to each other.

[0085] For example, the horizontal transport module may include a horizontally movable configuration, and the vertical transport module may be connected to the horizontally movable configuration and may be horizontally moved together with the horizontally movable configuration. In addition, the vertical transport module may include a vertically movable configuration, and the plant cultivation lighting device (1) according to the first embodiment of the present invention may be connected to the vertically movable configuration and may be vertically moved together with the vertically movable configuration.

[0086] The lighting device (1) for plant cultivation according to the first embodiment of the present invention can be moved horizontally by the operation of the horizontal transport module and vertically by the operation of the vertical transport module, so that the light distribution position of the LED light source (115, see FIGS. 7 and 9) can be appropriately adjusted according to the growth height of the cultivated plants. Through this, not only can the light distribution be uniform for the entire cultivated crop, but also the growth performance of the cultivated crop can be improved by controlling the oxygen and heated air within the cultivation housing to flow appropriately to the necessary places.

[0087] A lighting device (1) for plant cultivation according to the first embodiment of the present invention may include a housing (10, 20), an LED (light emitting diode) assembly (100), and a blower fan (410).

[0088] The housing (10, 20) can form the external shape of a lighting device (1) for plant cultivation. The housing (10, 20) can have an upper surface and a lower surface that are open, respectively. That is, the housing (10, 20) can have an upper surface and a lower surface that are open on both sides in directions that are orthogonal to the left-right direction, which is the direction of both sides of the heat dissipation fins (130), and the front-back direction, which is the direction of arrangement of the multiple LED light sources (115).

[0089] The housing (10, 20) may include a first housing (10) and a second housing (20). The first housing (10) may be a housing of an LED assembly (100) in which at least a portion of the LED assembly (100) is disposed inside, and the second housing (20) may be a housing of a blower fan (410) in which a blower fan (410) is disposed inside.

[0090] The first housing (10) can be coupled to the lower side of the second housing (20) and placed on the lower side of the second housing (20). The second housing (20) can be coupled to the upper side of the first housing (10) and placed on the upper side of the first housing (10).

[0091] The first housing (10) and the second housing (20) may be connected vertically. That is, the first housing (10) may have an upper surface and a lower surface that are open, and the second housing (20) may also have an upper surface and a lower surface that are open, respectively. The second housing (20) may cover a portion of the opened upper surface of the first housing (10).

[0092] A rim coupling rib (25) may be formed at the lower end of the second housing (20). The rim coupling rib (25) may be inserted into the opened upper surface of the first housing (10) and coupled to the upper inner peripheral rim of the first housing (10). That is, the rim coupling rib (25) may be inserted into the opened upper surface of the first housing (10) and come into contact with the upper inner peripheral rim of the first housing (10), and in this state, the rim coupling rib (25) may be fastened to the upper portion of the first housing (10) through a plurality of bolts or a plurality of screws. Fastening holes may be formed in the upper portion of the first housing (10) and the rim coupling rib (25) to be fastened to each other through the plurality of bolts or the plurality of screws.

[0093] The first housing (10) and the second housing (20) may be formed in shapes corresponding to each other. In the present embodiment, the first housing (10) and the second housing (20) may be formed in a square cylinder shape. The front-to-back length of the second housing (20) may be formed to be longer than the front-to-back length of the first housing (20), the left-to-right length of the second housing (20) may be formed to be longer than the left-to-right length of the first housing (10), and the vertical length of the second housing (20) may be formed to be shorter than the vertical length of the first housing (10).

[0094] A mounting bracket (11, 12) may be coupled to the housing (10, 20). The lower portion of the mounting bracket (11, 12) may be fastened to the housing (10, 20) using a plurality of bolts or a plurality of screws, and the upper portion of the mounting bracket (11, 12) may be arranged to protrude upward from the housing (10, 20). The upper portion of the mounting bracket (11, 12) that protrudes toward the rear of the housing (10, 20) may be bent into a shape that surrounds a power supply unit (SMPS; Switching Mode Power Supply, not shown). That is, the power supply unit may be mounted to the upper portion of the mounting bracket (11, 12) using a plurality of bolts or a plurality of screws. In this case, the power supply unit may be installed in one of the horizontal transport module and the vertical transport module.

[0095] In this embodiment, the lower part of the mounting bracket (11, 12) is illustrated as being coupled to the first housing (10), but the lower part of the mounting bracket (11, 12) may also be coupled to the second housing (20).

[0096] The mounting bracket (11, 12) may include a first mounting bracket (11) and a second mounting bracket (12). The lower end of the first mounting bracket (11) may be coupled to the front of the housing (10, 20), and the lower end of the second mounting bracket (12) may be coupled to the rear of the housing (10, 20). Specifically, the lower end of the first mounting bracket (11) may be coupled to the front of the first housing (10), and the lower end of the second mounting bracket (12) may be coupled to the rear of the first housing (20).

[0097] In this way, the first mounting bracket (11) can be coupled to the front side of the housing (10, 20), and the second mounting bracket (12) can be coupled to the rear side of the housing (10, 20). However, the first mounting bracket (11) and the second mounting bracket (12) may also be coupled to the left side and the right side of the housing (10, 20), respectively. That is, the first mounting bracket (11) and the second mounting bracket (12) can be coupled to both sides located on opposite sides of the housing (10, 20), and supported by the power supply device installed in one of the horizontal transport module and the vertical transport module.

[0098] The LED assembly (100) may include an LED housing (120) and a heat dissipation fin (130).

[0099] An LED substrate (110, see FIGS. 7 to 9) may be accommodated inside the LED housing (120). Here, a plurality of LED light sources (115, see FIGS. 7 and 9) that generate light may be provided on the lower surface of the LED substrate (110). Here, when the LED substrate (110) is accommodated within the LED housing (120), the LED substrate (110) and the LED housing (120) may constitute an LED unit.

[0100] The LED housing (120) can distribute light from multiple LED light sources (115) forward. The lower portion of the LED housing (120) can be formed of a material that can transmit light, and the upper portion of the LED housing (120) can be formed of a material that cannot transmit light. Accordingly, the LED housing (120) can distribute light from multiple LED light sources (115) downward through its lower portion.

[0101] The LED housing (120) may have a lower portion formed of a material that allows light to pass through and protrude downward through the opened lower surface of the first housing (10). The LED housing (120) may have an upper portion formed of a material that does not allow light to pass through and may be positioned inside the first housing (10).

[0102] The lower part of the heat dissipation fin (130) can be coupled to the upper surface of the LED housing (120). The heat dissipation fin (130) can be coupled to the upper surface of the LED housing (120) to dissipate heat generated from a plurality of LED light sources (115) arranged inside the LED housing (120). The heat dissipation fin (130) can be arranged inside the first housing (10).

[0103] Here, the heat dissipation fin (130) may be formed as a PTX (plate thermal exchanger). That is, the heat dissipation fin (130) may be a plate-shaped heat exchanger that dissipates heat from the LED light source (115).

[0104] A plurality of LED assemblies (100) may be arranged spaced apart from each other in the direction of both sides of the heat dissipation fins (130). That is, in the present embodiment, the plurality of LED assemblies (100) are arranged spaced apart from each other in the left-right direction, but the plurality of LED assemblies (100) may also be arranged spaced apart from each other in the front-back direction.

[0105] In this embodiment, since the plurality of LED assemblies (100) are arranged to be spaced apart from each other in the left-right direction, the plurality of LED assemblies (100) can be formed to be long in the front-to-back direction. That is, when the plurality of LED assemblies (100) are arranged to be spaced apart from each other in the left-to-right direction, the LED substrate (110) can be formed to be long in the front-to-back direction, the LED housing (120) can be formed to be long in the front-to-back direction, and the heat dissipation fins (130) can be formed to be long in the front-to-back direction. In addition, when the plurality of LED assemblies (100) are arranged to be spaced apart from each other in the front-to-back direction, the LED substrate (110) can be formed to be long in the left-to-right direction, the LED housing (120) can be formed to be long in the left-to-right direction, and the heat dissipation fins (130) can be formed to be long in the left-to-right direction.

[0106] The blower fan (410) can be arranged above a plurality of LED assemblies (100) and blow air downward. The blower fan (410) can blow air that flows sequentially along the outer surfaces of the heat dissipation fins (130) and the LED housing (120). The blower fan (410) can be arranged inside the second housing (20). The heat dissipation performance of the heat dissipation fins (130) can be improved by the wind blown downward by the blower fan (410). In addition, since the heat dissipated from the heat dissipation fins (130) is discharged through the opened lower surface of the first housing (10) by the wind blown downward by the blower fan (410), the plant cultivation lighting device (1) according to the first embodiment of the present invention can be used as a heater.

[0107] The blower fan (410) may be composed of a plurality of blower fans (410) that are spaced apart from each other in the radial direction of the rotation axis of the blower fan (410). The blower fan (410) may be composed of a plurality of blower fans (410) that are spaced apart from each other in the front-back direction, which is a direction perpendicular to the left-right direction, which is the direction of both sides of the heat dissipation fin (130). In the present embodiment, the blower fan (200) may include a first blower fan (411) and a second blower fan (412).

[0108] The rotation axis of the first blower fan (411) may be arranged to be long in the vertical direction, and the rotation axis of the second blower fan (412) may be arranged to be long in the vertical direction. The first blower fan (411) and the second blower fan (412) may be arranged to be spaced apart from each other in the front-back direction, which is the radial direction of each of the rotation axes. That is, the first blower fan (411) may be arranged to be spaced apart from the second blower fan (412) in the front, and the second blower fan (412) may be arranged to be spaced apart from the first blower fan (411) in the rear. However, the first blower fan (411) and the second blower fan (412) may also be arranged to be spaced apart from each other in the left-right direction.

[0109] Meanwhile, a distribution box (30) may be installed at the lower rear portion of the first housing (10). The distribution box (30) may be formed in a rectangular shape. A power connector (31) connected to the power connector of the power supply device and a power cable may be protruded at the rear of the distribution box (30). Inside the distribution box (30), a distribution board (not shown) may be provided to supply electricity to a plurality of LED light sources (115) by supplying electricity to an LED board (110) provided in each of a plurality of LED assemblies (100).

[0110] In this embodiment, since the plurality of LED assemblies (100) are arranged lengthwise in the front-back direction, the distribution box (30) is installed at the lower rear portion of the first housing (10), but the distribution box (30) may also be installed at the lower front portion of the first housing (10). In addition, when the plurality of LED assemblies (100) are arranged lengthwise in the left-right direction, the distribution box (30) may also be installed at the lower left side portion of the first housing (10) or the lower right side portion of the first housing (10).

[0111] Hereinafter, the description will be limited to a case where multiple LED assemblies (100) are arranged lengthwise in the front-back direction, and the distribution box (30) is installed at the lower rear portion of the first housing (10).

[0112] Fig. 4 is a drawing showing the state in which the distribution box is separated from Fig. 1 and an enlarged view of a portion thereof, and Fig. 5 is a rear perspective view of Fig. 4 and an enlarged view of a portion thereof.

[0113] Referring to FIG. 1, FIG. 4, and FIG. 5, a plurality of LED assemblies (100) may have a power terminal (125) protrudingly formed on the rear surface of each LED housing (120). Here, the rear surface of the LED housing (120) may mean one side in the longitudinal direction of the LED housing (120). That is, the power terminal (125) may be protrudingly formed on one side in the longitudinal direction of the LED housing (120).

[0114] In addition, a plurality of through holes (35) may be formed on the front of the distribution box (30) through which power terminals (125) protruding from the rear of each LED housing (120) pass. Here, the front of the distribution box (30) may be a surface of the distribution box (30) that faces one side of the LED housing (120). That is, the plurality of through holes (35) may be formed on a surface of the distribution box (30) that faces one side of the LED housing (120).

[0115] The rear surface of the LED housing (120) positioned at the lower end of each of the multiple LED assemblies (100) can be in contact with the front surface of the distribution box (30).

[0116] The power terminal (125) protrudingly formed on the rear surface of each LED housing (120) can be electrically connected to the LED substrate (110) disposed within each LED housing (120). In addition, the power terminal (125) protrudingly formed on the rear surface of each LED housing (120) can pass through a plurality of through holes (35) formed on the front surface of the distribution box (30) and be electrically connected to the distribution substrate disposed within the distribution box (30). Accordingly, electricity supplied from the power supply device to the distribution substrate of the distribution box (30) through the power cable can be supplied to each LED substrate (110) provided in a plurality of LED assemblies (100), and can be supplied to a plurality of LED light sources (115) disposed on each LED substrate (110).

[0117] A plurality of LED assemblies (100) can be formed with the same configuration. Hereinafter, one LED assembly (100) among the plurality of LED assemblies (100) will be described as an example with reference to FIGS. 6 to 10.

[0118] FIG. 6 is a drawing showing the LED assembly shown in FIG. 3, FIG. 7 is an exploded perspective view of FIG. 6, FIG. 8 is a drawing of FIG. 7 viewed from above, FIG. 9 is a cross-sectional view of FIG. 6, and FIG. 10 is an exploded perspective view of the heat dissipation fin shown in FIG. 6 and an enlarged view of a portion thereof.

[0119] Referring to FIGS. 6 to 10, the LED assembly (100) may include an LED housing (120) and a heat dissipation fin (130).

[0120] An LED substrate (110) may be placed inside the LED housing (120). A plurality of LED light sources (115) may be arranged in the longitudinal direction on the lower surface of the LED substrate (110). That is, the LED substrate (110) may be formed to be long in the front-back direction, and the plurality of LED light sources (115) may be arranged in the front-back direction on the lower surface of the LED substrate (110). In the present embodiment, the plurality of LED light sources (115) are arranged in one row left and right, but may also be arranged in multiple rows left and right. A circuit for supplying electricity to the plurality of LED light sources (115) may be printed on the LED substrate (110).

[0121] The LED housing (120) can be formed to be long in the longitudinal direction of the LED substrate (100). That is, the LED housing (120) can be formed to be long in the front-back direction.

[0122] The LED housing (120) may include an LED housing cover (121) and an LED housing body (122). The LED housing cover (121) may be coupled to the LED housing body (122) and disposed on the lower side of the LED housing body (122). The LED housing body (122) may be coupled to the LED housing cover (121) and disposed on the upper side of the LED housing cover (121). The LED housing cover (121) and the LED housing body (122) may be coupled to each other, such that the LED housing cover (121) may form the lower part of the LED housing (120), and the LED housing body (122) may form the upper part of the LED housing (120). The lower part of the heat dissipation fin (130) may be coupled to the LED housing body (122).

[0123] The upper surface of the LED housing cover (121) can be opened, and an LED substrate (110) can be accommodated in the internal space of the LED housing cover (121). The LED housing body (122) can be coupled to the LED housing cover (121) to cover the opened upper surface of the LED housing cover (121).

[0124] The LED housing cover (121) may be formed of a material that transmits the light generated from the plurality of LED light sources (115), and the LED housing body (122) may be formed of a material that does not transmit the light generated from the plurality of LED light sources (115). For example, the LED housing cover (121) may be formed of a plastic material, and the LED housing body (122) may be formed of a metal material that transfers heat to the heat dissipation fins (130). The LED housing body (122) may be formed of a metal material with excellent thermal conductivity. Here, the metal material with excellent thermal conductivity may be a metal material including aluminum.

[0125] The LED housing body (122) may have a pair of joining grooves (122A) formed on the lower surface facing the LED housing cover (121), into which the left and right sides (121A) of the LED housing cover (121) are respectively inserted and joined. A plurality of hook portions (121B) may be formed spaced apart from each other in the front and rear directions on the left and right sides (121A) of the LED housing cover (121). A catching protrusion (122D) on which the plurality of hook portions (121B) are caught may be formed within the joining groove (122A).

[0126] The heat dissipation fin (130) may be formed to have a length corresponding to the length of the LED substrate (110). That is, the front-back length of the heat dissipation fin (130) may be formed to have a length corresponding to the front-back length of the LED substrate (110). Accordingly, since the heat dissipation fin (130) can quickly dissipate heat generated from a plurality of LED light sources (115), the heat dissipation performance of the heat dissipation fin (130) may be improved.

[0127] A first pin coupling slot (122B) into which a lower end of a heat dissipation fin (130) is inserted may be formed on the upper surface of the LED housing (120). The first pin coupling slot (122B) may be formed by recessing downward from the upper surface of the LED housing (120) in the form of a slot having a predetermined depth. The first pin coupling slot (122B) may be formed on the upper surface of the LED housing body (122), which is a component forming the upper portion of the LED housing (120). The first pin coupling slot (122B) may extend from one end of the LED housing body (122) to the other end. That is, the first pin coupling slot (122B) may extend from the front end to the rear end of the LED housing body (122).

[0128] The lower end of the heat dissipation fin (130) can be fixed to the LED housing (120) by welding or epoxy while being inserted into the first pin coupling slot (122B) of the LED housing body (122). That is, the lower end of the heat dissipation fin (130) can be fixed to the LED housing body (122) by welding or epoxy while being inserted into the first pin coupling slot (122B) of the LED housing body (122).

[0129] A refrigerant flow space (135) in which the refrigerant flows may be formed inside the radiating fin (130). That is, the refrigerant flow space (135) of the radiating fin (130) may be filled with refrigerant. The radiating fin (130) can quickly radiate heat from multiple LED light sources (115) by utilizing evaporation and condensation of the refrigerant.

[0130] That is, the lower part of the heat dissipation fin (130), which is the part inserted into the first pin coupling slot (122B) of the LED housing body (122), can function as the evaporation end (131), and the upper part, which is the part protruding upward of the LED housing body (122) excluding the evaporation end (131), can function as the condensation end (132).

[0131] That is, the refrigerant flowing in the refrigerant flow space (135) of the heat dissipation fin (130) can be evaporated by heat exchange with the heat transferred from the LED housing (120) to the evaporation end (131), and can be condensed by heat exchange with the internal air of the first housing (10) at the condensation end (132).

[0132] Here, the heat dissipation fin (130) is preferably made of a metal material with excellent thermal conductivity in order to increase the heat exchange performance between the refrigerant that has been phase-changed into a gaseous state in the refrigerant flow space (135) by heat transferred from the LED light source (115) through the LED housing body (122) of the LED housing (120) and the external air of the heat dissipation fin (130).

[0133] Among existing metals, aluminum (or aluminum alloy) is generally preferred in this field due to its superior thermal conductivity and relatively light weight. However, despite its inherently superior thermal conductivity, aluminum (or aluminum alloy) can be limited in the types of refrigerants it can be filled with.

[0134] That is, when the heat dissipation fin (130) is adopted as a metal base material panel made of aluminum (or alloy aluminum), it is preferable that the adoptable refrigerant be one that does not chemically react with aluminum (or alloy aluminum). At this time, when water is adopted as the refrigerant, a rapid oxidation reaction (chemical reaction) occurs on the surface of aluminum (or alloy aluminum) that comes into contact with water, generating hydrogen, and the problem of increasing the internal pressure (internal pressure) of the refrigerant flow space (135) due to the generated hydrogen may occur.

[0135] Accordingly, when the refrigerant is water, it is preferable that the heat dissipation fin (130) be made of a material that hardly causes a chemical reaction with water, and more preferably, it can be made of a material including stainless steel (e.g., SUS).

[0136] More specifically, the refrigerant filled in the refrigerant flow space (135) of the heat dissipation fin (130) is formed as a phase-changeable material that is in a liquid state at room temperature and can be evaporated into a gaseous state by heat transferred from the LED light sources (115), but can be formed as water that does not cause a chemical reaction when in surface thermal contact with an aluminum (or aluminum alloy) material.

[0137] However, if the heat dissipation fin (130) is made of aluminum (or alloy aluminum), water must inevitably be excluded as a refrigerant to minimize the chemical reaction described above, and it is inevitable to use expensive refrigerants such as Honeywell refrigerants or other phase-changeable refrigerants that may cause environmental pollution.

[0138] Therefore, when the refrigerant is formed of water, it is preferable that the heat dissipation fin (130) be formed of a material including stainless steel rather than a material including aluminum.

[0139] The heat dissipation fin (130) may be formed in a shape in which the upper corner of the rear end is removed from the square plate shape and the slanted portion (134) is formed. That is, the heat dissipation fin (130) may be formed in a shape in which the upper corner of the rear end is formed with the slanted portion (134). However, the slanted portion (134) does not necessarily have to be formed by removing the upper corner of the rear end of the heat dissipation fin (130), and may be formed by removing the upper corner of the front end of the heat dissipation fin (130). That is, the slanted portion (134) may be formed by removing one corner of the heat dissipation fin (130) opposite to the portion that is inserted into the first pin coupling slot (122B) formed in the LED housing body (122) of the LED housing (120).

[0140] An air vent tube (136) protruding outward from the inclined portion (134) may be installed on the inclined portion (134). The air vent tube (136) may be configured to discharge only air from the refrigerant flow space (135) without discharging the water, which is the refrigerant contained in the refrigerant flow space (135). Alternatively, the configuration to discharge only air from the refrigerant flow space (135) without discharging the water, which is the refrigerant contained in the refrigerant flow space (135) may be installed near the air vent tube (136) inside the heat dissipation fin (130) without being installed on the air vent tube (136).

[0141] A tube insertion tube portion (137) into which one end of an air vent tube (136) is inserted and installed can be formed protrudingly in the inclined portion (134). By forming the inclined portion (134) in the heat dissipation fin (130), an installation space for the air vent tube (136) can be secured within the first housing (10).

[0142] The heat dissipation fin (130) forms a refrigerant flow space (135) by joining the edge ends of two panels (130-1, 130-2) to each other, and it is preferable that the joining be formed in a way that maintains airtightness with the outside to prevent leakage of the refrigerant filled in the refrigerant flow space (135).

[0143] Among the two panels (130-1, 130-2), the panel forming one side of the heat dissipation fin (130) can be referred to as a one-side heat dissipation fin (130-1), and the panel forming the other side of the heat dissipation fin (130) can be referred to as a other-side heat dissipation fin (130-2).

[0144] One side heat dissipation fin (130-1) and the other side heat dissipation fin (130-2) are formed in a roughly rectangular shape, but have a shape in which the rear upper corner among the four corners is removed to form an inclined portion (134), and one side of a tube insertion tube portion (137) into which an air vent tube (136) can be inserted and fixed can be formed to protrude in the inclined portion (134).

[0145] Fig. 11 is a perspective view showing a lighting device for plant cultivation according to a second embodiment of the present invention, Fig. 12 is a bottom perspective view of Fig. 11, Fig. 13 is an exploded perspective view of Fig. 11 and a partially enlarged view thereof, and Fig. 14 is a rear perspective view of Fig. 13 and a partially enlarged view thereof. Here, components having the same function as the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above will be described by assigning the same drawing reference numerals.

[0146] Hereinafter, in terms related to directions such as up, down, front, back, left, and right in the description, the up, down, front, back, left, and right directions follow the directions indicated by arrows in Fig. 11. In addition, the left and right directions may refer to the directions on both sides of the heat dissipation fins (130, see Figs. 15 to 17, and Figs. 23 and 24).

[0147] Referring to FIGS. 11 to 14, it can be seen that the lighting device (2) for plant cultivation according to the second embodiment of the present invention has differences compared to the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above.

[0148] That is, the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above included a housing (10, 20), but the lighting device (2) for plant cultivation according to the second embodiment of the present invention may include an end plate (200, 300) instead of the housing (10, 20) of the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above.

[0149] In addition, the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above included a blower fan (410), but the lighting device (2) for plant cultivation according to the second embodiment of the present invention may include a blower fan assembly (400) instead of the blower fan (410) of the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above.

[0150] In addition, the lighting device (1) for plant cultivation according to the first embodiment of the present invention described above includes an LED assembly (100) including an LED housing (120) and a heat dissipation fin, but the LED assembly (100) of the lighting device (2) for plant cultivation according to the second embodiment of the present invention may further include a heat dissipation guider (140, FIGS. 15 to 17) compared to the LED assembly (100) of the lighting device (1) for plant cultivation according to the first embodiment described above.

[0151] Specific differences in the plant cultivation lighting device (2) according to the second embodiment of the present invention compared to the plant cultivation lighting device (1) according to the first embodiment of the present invention described above can be confirmed in the description below.

[0152] A lighting device (2) for plant cultivation according to a second embodiment of the present invention may include a plurality of LED assemblies (100), end plates (200, 300) each connecting both ends of the plurality of LED assemblies (100), and a blower fan assembly (400) arranged on the upper side of the plurality of LED assemblies (100).

[0153] A plurality of LED assemblies (100) may be arranged spaced apart from each other in the left-right direction. The plurality of LED assemblies (100) may be provided in six pieces. However, the number of the plurality of LED assemblies (100) is not necessarily six, and may be modified to have various numbers.

[0154] The end plate (200, 300) may include a first end plate (200) and a second end plate (300). The end plates (200, 300) may be formed in an approximately square plate shape. The first end plate (200) may be formed in an approximately square plate shape, and the second end plate (300) may be formed in an approximately square plate shape. The first end plate (200) may be coupled to the front ends of the plurality of LED assemblies (100) to connect the front ends of the plurality of LED assemblies (100). The second end plate (300) may be coupled to the rear ends of the plurality of LED assemblies (100) to connect the rear ends of the plurality of LED assemblies (100).

[0155] The blower fan assembly (400) can be coupled to the upper portion of a plurality of LED assemblies (10) and arranged on the upper side of the plurality of LED assemblies (100). Specifically, since the uppermost component among the LED assemblies (100) is a heat dissipation guider (140, see FIGS. 15 to 17), the blower fan assembly (400) can be coupled to the upper portion of the heat dissipation guider (140) and arranged on the upper side of the plurality of LED assemblies (100).

[0156] The blower fan assembly (400) may have a fan body (413) that rotates around a vertical axis as a center of rotation. Specifically, the blower fan assembly (400) may include a blower fan (410) and a fan bracket (420), and the blower fan (410) may have a fan body (413).

[0157] The blower fan (410) may be provided with a plurality of blower fans (410) spaced apart from each other in the front-back direction. The plurality of blower fans (410) are provided in three units, but may be modified to have various numbers.

[0158] The blower fan (410) may include a fan body (413) having blades, a fan housing (414) that rotatably supports the fan body (413), and a grill cover (415) that is coupled to the upper side of the fan housing (414) and covers the fan body (413) to allow air to pass through.

[0159] The fan body (413) can be rotated in both directions with the vertical axis as the rotation center. When the fan body (413) is rotated in one direction with the vertical axis as the rotation center, it can suck in air from the lower side and blow it upward, and when it is rotated in the other direction with the vertical axis as the rotation center, it can suck in air from the upper side and blow it downward. That is, when the fan body (413) is rotated in one direction, it can cause oxygen generated by the cultivated plants to flow upward, and when it is rotated in the other direction, it can blow the heated air dissipated by the heat dissipation fins (130) toward the cultivated plants.

[0160] The fan housing (414) may be formed in a square shape. A circular receiving space may be formed in the center of the fan housing (414) in which the fan body (413) is rotatably received.

[0161] The grill cover (415) can be coupled to the upper side of the fan housing (414) and can be formed with multiple air inlets for air to enter and exit. The multiple air inlets can be formed to a size that does not allow the user's fingers to enter, thereby preventing the user's fingers from being injured by the rotation of the fan body (413).

[0162] The fan bracket (420) can support the blower fan (410). The fan bracket (420) can be placed at each of the four corners of the fan housing (414). The fan bracket (420) is installed on the heat dissipation guider (140, FIGS. 15 to 17), which is an upper component of the LED assembly (100), so that a plurality of blower fans (410) can be placed on the upper side of the plurality of LED assemblies (100).

[0163] Specifically, a heat dissipation tip (142, see FIGS. 21 and 22) may be formed on the upper portion of the heat dissipation guide (140), and a tip portion coupling groove (422) into which the heat dissipation tip (142) is inserted and coupled may be formed on the lower portion of the fan bracket (420). A pair of tip portion coupling grooves (422) may be formed long in the front and rear directions and spaced apart from each other in the left and right directions on one fan bracket (420). By inserting and coupling the heat dissipation tip (142) of the heat dissipation guide (140) into the top coupling groove (422) of the fan bracket (420), the blower fan (410) may be installed on the upper portion of the LED assembly (100).

[0164] A plurality of blower fans (410) may be arranged on the upper side of the fan bracket (420) and may be fastened to the fan bracket (420) via a spiral fastening member. Here, the spiral fastening member may refer to a fastening member having a spiral formed on the outer surface, and may be a screw or a bolt. All spiral fastening members appearing in the following description may refer to a fastening member having a spiral formed on the outer surface, and may be a screw or a bolt.

[0165] Fig. 15 is a drawing showing the LED assembly shown in Fig. 13, Fig. 16 is an exploded perspective view of Fig. 15, and Fig. 17 is a bottom perspective view of Fig. 16.

[0166] Referring to FIGS. 15 to 17, the LED assembly (100) may include an LED housing (120), a heat dissipation fin (130), and a heat dissipation guide (140).

[0167] The LED housing (120) can be coupled to the lower end of the heat dissipation fin (130), and the heat dissipation guide (140) can be coupled to the upper end of the heat dissipation fin (130).

[0168] The LED housing (120) may have an LED light source (115, see FIG. 19) inside. The heat dissipation guide (140) may be formed of a metal material having the same thermal conductivity as the heat dissipation fin (130) or may be formed of a metal material having a higher thermal conductivity than the heat dissipation fin (130), thereby improving the heat dissipation performance of the heat dissipation fin (130).

[0169] The heat of the LED housing (120) can be transferred to the heat dissipation fin (130). That is, the LED light source (115) can generate light and heat. The light generated from the LED light source (115) can be irradiated to cultivated plants and help the plants grow. The heat generated from the LED light source (115) can be transferred to the heat dissipation fin (130) through the LED housing (120), and the heat dissipation fin (130) can be heated by the heat of the LED light source (115) transferred from the LED housing (120).

[0170] The heat dissipation fin (130) may be formed by a pair of heat dissipation fins (130) arranged in the front-back direction. That is, one LED housing (120) may be coupled to the lower end of one pair of heat dissipation fins (130), and one heat dissipation guider (140) may be coupled to the upper end of one pair of heat dissipation fins (130).

[0171] Hereinafter, the specific structures of the LED housing (120), heat dissipation guide (140), and heat dissipation fin (130), which are components of the LED assembly (100), will be described.

[0172] First, the specific configuration of the LED housing (120) will be described below.

[0173] Fig. 18 is a drawing showing the front end of the LED unit shown in Fig. 16, Fig. 19 is a bottom perspective view of Fig. 18, and Fig. 20 is a cross-sectional view showing the lower end of the LED assembly shown in Fig. 15.

[0174] Referring to FIGS. 18 to 20, an LED substrate (110) may be placed inside an LED housing (120). The LED housing (120) may include an LED housing cover (121) and an LED housing body (122). The LED housing cover (121) and the LED housing body (122) may be combined with each other to form an LED housing (120) that accommodates the LED substrate (110) inside. That is, the LED housing (120) may include an LED housing cover (121) and an LED housing body (122).

[0175] The LED substrate (110) can be formed into a long rectangular plate shape in the front-back direction. On the lower surface of the LED substrate (110), a plurality of LED light sources (115) can be arranged lengthwise.

[0176] The LED substrate (110) may be formed of FR4 (flame retardant 4) material used to form a typical printed circuit board, or may be formed of a metal material (metal PCB) to facilitate the transfer of heat transmitted through the heating surface of the LED light source (115) to the upper surface of the LED substrate (110).

[0177] On the lower surface of the LED substrate (110), a plurality of LED light sources (115) may be arranged in a single row in the front-back direction, which is the longitudinal direction of the LED substrate (110). However, on the lower surface of the LED substrate (110), a plurality of LED light sources (115) may be arranged in two or more rows in the front-back direction, which is the longitudinal direction of the LED substrate (110).

[0178] Light generated from multiple LED light sources (115) can be irradiated in the downward direction of the LED substrate (110), and heat generated by the electrical operation of the multiple LED light sources (115) can be transmitted in the upward direction of the LED substrate (110).

[0179] Here, when the LED substrate (110) is made of FR4 material, which is a typical PCB material, a plurality of through holes (not shown) that penetrate vertically through the LED substrate (110) to expose the heating surfaces of the plurality of LED light sources (115) to the upper side of the LED substrate (110), and when the LED substrate (110) is made of a metal material, the heat of the LED light source (115) can be transferred to the upper side of the LED substrate (110) in a heat conduction manner using the metal PCB as a medium.

[0180] An LED substrate (110) can be installed on the lower surface of the LED housing body (122). The upper surface of the LED substrate (110) can be in contact with the lower surface of the LED housing body (122).

[0181] The heat dissipation fin (130) can be coupled to the upper surface of the LED housing body (122) and protruded upwardly from the LED housing body (122). The heat dissipation fin (130) can transfer the heat of the LED substrate (110), which is heat generated from the LED light source (115), to its lower portion via the LED housing body (122) and move it to its upper portion, thereby dissipating the heat.

[0182] The LED housing body (122) may be formed of a metal material with excellent thermal conductivity. For example, the metal material with excellent thermal conductivity may be aluminum or an aluminum alloy. The LED housing body (122) may be made of the same material as the heat dissipation fin (130).

[0183] The lower part of the heat dissipation fin (130) may be inserted and connected to the upper surface of the LED housing body (122). More specifically, a first pin coupling slot (122B) that is sunken downward in the form of a slot having a predetermined depth may be formed on the upper surface of the LED housing body (122). The first pin coupling slot (122B) may extend from one end of the LED housing body (122) to the other end. That is, the first pin coupling slot (122B) may extend from the front end to the rear end of the LED housing body (122).

[0184] The lower part corresponding to the evaporation end (131, see Fig. 23) of the heat dissipation fin (130) can be fitted into the first pin coupling slot (122B). That is, the evaporation end (131) of the heat dissipation fin (130) can refer to a part that is fitted into the first pin coupling slot (122B).

[0185] The LED housing cover (121) can be placed on the lower side of the LED housing body (122) and can be coupled to the LED housing body (122). The LED housing cover (121) and the LED housing body (122) can be coupled to each other, and the LED housing cover (121) and the LED housing body (122) can function as an LED housing (120) in which an LED substrate (110) is accommodated in an internal space formed by coupling to each other.

[0186] The LED housing cover (121) can transmit light generated from multiple LED light sources (115). That is, the light generated from multiple LED light sources (115) can be transmitted through the LED housing cover (121) and irradiated to the cultivated plants. In order to irradiate a large amount of light from multiple LED light sources (115) to the cultivated plants, the LED housing cover (121) is preferably formed of a transparent plastic material that transmits the light generated from multiple LED light sources (115).

[0187] On the lower surface of the LED housing body (122), a coupling groove (122A) may be formed long in the front and rear directions on the left and right sides that are outside the LED substrate (110), and the left and right sides (121A) of the LED housing cover (121) may be inserted into the coupling groove (122A) and coupled. The coupling groove (122A) may extend from one end of the LED housing body (122) to the other end. That is, the coupling groove (122A) may extend from the front end to the rear end of the LED housing body (122). The left and right sides (121A) may extend from one end to the other end of the LED housing cover (121). That is, the left and right sides (121A) may extend from the front end to the rear end of the LED housing cover (121).

[0188] The left and right sides (121A) of the LED housing cover (121) can be formed in a vertical plate shape, and the space between the left and right sides (121A) of the LED housing cover (121) can be formed in a horizontal plate shape.

[0189] A plurality of hook portions (121B) may be formed on both left and right sides (121A) of the LED housing cover (121) and spaced apart from each other in the front and rear, and a catch (122D) on which the plurality of hook portions (121B) are caught may be formed within the joining groove (122A) of the LED housing body (122). When the left and right sides (121A) of the LED housing cover (121) are inserted into the joining groove (122A) of the LED housing body (122), the plurality of hook portions (121B) are caught on the catch (122D), so that the LED housing cover (121) and the LED housing body (122) can be connected to each other.

[0190] Meanwhile, a fastening groove (122C) may be formed in the LED housing body (122). The fastening groove (122C) may be formed as a pair of fastening grooves (122C) that are spaced apart from each other on the left and right. The pair of fastening grooves (122C) may be formed on each of the left and right sides based on the first pin coupling slot (122B). The pair of fastening grooves (122C) may extend from one end of the LED housing body (122) to the other end. That is, the pair of fastening grooves (122C) may extend from the front end to the rear end of the LED housing body (122). Among the pair of fastening grooves (122C), the left side of the fastening groove (122C) that is arranged on the left side may be open, and the right side of the fastening groove (122C) that is arranged on the right side may be open. A pair of fastening grooves (122C) may be positioned higher than a pair of joining grooves (122A).

[0191] A fastening hole through which a spiral fastening member (220, see Fig. 25) passes may be formed at a position corresponding to the front end of the fastening groove (122C) at the lower end of the first end plate (200). By fastening the spiral fastening member (220) to the front end of the fastening groove (122C), the lower end of the first end plate (200) may be fastened to the front end of the LED housing body (122).

[0192] The spiral fastening members (220) penetrating the fastening holes formed in the lower portion of the first end plate (200) may be provided in the same number as the fastening grooves (122C) formed in the LED housing body (122). In the present embodiment, as shown in FIGS. 11 to 14, since the front ends of six LED assemblies (100) are coupled to the first end plate (200), twelve spiral fastening members (220) are provided in the lower portion of the first end plate (200).

[0193] A fastening hole through which a spiral fastening member (320, see Fig. 26) passes may be formed at a position corresponding to the rear end of the fastening groove (122C) at the lower end of the second end plate (300). By fastening the spiral fastening member (320) to the rear end of the fastening groove (122C), the lower end of the second end plate (300) may be fastened to the rear end of the LED housing body (122).

[0194] The spiral fastening members (320) penetrating the fastening holes formed at the lower end of the second end plate (300) may be provided in the same number as the fastening grooves (122C) formed at the LED housing body (122). In the present embodiment, as shown in FIGS. 11 to 14, the rear ends of six LED assemblies (100) are coupled to the second end plate (300), so twelve spiral fastening members (320) are provided at the lower end of the second end plate (300).

[0195] Secondly, the specific configuration of the heat dissipation guider (140) will be described below.

[0196] Fig. 21 is a drawing showing the front end of the heat dissipation guide shown in Fig. 16, and Fig. 22 is a cross-sectional view showing the upper end of the LED assembly shown in Fig. 15.

[0197] Referring to FIGS. 21 and 22, a heat dissipation guider (140) may be coupled to the upper end of a heat dissipation fin (130) to improve the heat dissipation performance of the heat dissipation fin (130). The front-to-back length of the heat dissipation guider (140) may be formed to correspond to the length of the upper end of the heat dissipation fin (130).

[0198] Specifically, a plurality of heat dissipation protrusions (141) may be formed on each of the left and right sides of the heat dissipation fin (130) in the left and right directions, respectively, of the heat dissipation guide (140). In the present embodiment, four heat dissipation protrusions (141) are formed on the left side of the heat dissipation guide (140), and four heat dissipation protrusions (141) are formed on the right side of the heat dissipation guide (140).

[0199] A plurality of heat dissipation protrusions (141) may be formed so that they are inclined toward the lower side as they go outward in the left-right direction, which is the direction of both sides of the heat dissipation fin (130). Since the plurality of heat dissipation protrusions (141) are formed so as to be inclined, compared to a case where the plurality of heat dissipation protrusions (141) are formed horizontally, the surface area of ​​the plurality of heat dissipation protrusions (141) that comes into contact with the outside air increases, thereby improving heat dissipation performance.

[0200] A plurality of heat dissipation protrusions (141) can extend in the longitudinal direction of the heat dissipation guider (140) in the front-back direction. The plurality of heat dissipation protrusions (141) can extend from one end of the heat dissipation guider (140) to the other end. That is, the plurality of heat dissipation protrusions (141) can be formed from the front end to the rear end of the heat dissipation guider (140).

[0201] A heat dissipation tip portion (142) having a circular cross-section and extending in the longitudinal direction of the heat dissipation guider may be formed at the upper end of the heat dissipation guider (140). The heat dissipation tip portion (142) may be inserted and coupled into a tip portion coupling groove (422, see FIG. 13) formed in a fan bracket (420, see FIG. 13). Here, the fan bracket (420) may be a support member that supports the blower fan (410), and the heat dissipation tip portion (142) of the heat dissipation guider (140) may be inserted and coupled into the tip portion coupling groove (422) of the fan bracket (420), so that the blower fan (410) may be coupled to the upper end of the heat dissipation guider (140) and placed on the upper side of the LED assembly (100).

[0202] Meanwhile, a second pin coupling slot (145) into which the upper end of the heat dissipation fin (130) is inserted and coupled may be formed on the lower surface of the heat dissipation guide (140). The second pin coupling slot (145) may be formed in a slot shape that is recessed upward from the lower surface of the heat dissipation guide (140) to a predetermined depth. The second pin coupling slot (145) may extend from one end of the heat dissipation guide (140) to the other end. That is, the second pin coupling slot (145) may extend from the front end to the rear end of the heat dissipation guide (140). The upper end of the heat dissipation fin (130) may be inserted and coupled into the second pin coupling slot (145).

[0203] Meanwhile, the front end of the heat dissipation guide (140) can be coupled to the upper end of the first end plate (200), and the rear end of the heat dissipation guide (140) can be coupled to the second end plate (300).

[0204] Specifically, a fastening hole (143) may be formed in the heat dissipation tip portion (142) of the heat dissipation guider (140). The fastening hole (143) may extend from one end of the heat dissipation tip portion (142) to the other end. That is, the fastening hole (143) may extend from the front end to the rear end of the heat dissipation tip portion (142).

[0205] A fastening hole may be formed at the upper end of the first end plate (200) at a position corresponding to the front end of the fastening hole (143), through which a spiral fastening member (210, see Fig. 25) passes. By fastening the spiral fastening member (220) to the front end of the fastening hole (143), the upper end of the first end plate (200) may be fastened to the front end of the heat dissipation guider (140).

[0206] The spiral fastening members (210) penetrating the fastening holes formed in the upper portion of the first end plate (200) may be provided in the same number as the fastening holes (143) formed in the heat dissipation tip portion (142). In the present embodiment, as shown in FIGS. 11 to 14, the front ends of six LED assemblies (100) are coupled to the first end plate (200), and therefore, six spiral fastening members (210) are provided in the upper portion of the first end plate (200).

[0207] A fastening hole through which a spiral fastening member (310, see FIGS. 26 and 27) passes may be formed at the upper end of the second end plate (300) at a position corresponding to the rear end of the fastening hole (143). By fastening the spiral fastening member (310) to the rear end of the fastening hole (143), the upper end of the second end plate (300) may be fastened to the rear end of the heat dissipation guider (140).

[0208] The spiral fastening members (310) penetrating the fastening holes formed in the upper portion of the second end plate (300) may be provided in the same number as the fastening holes (143) formed in the heat dissipation tip portion (142). In the present embodiment, as shown in FIGS. 11 to 14, the rear ends of six LED assemblies (100) are coupled to the second end plate (300), and therefore, six spiral fastening members (310) are provided in the upper portion of the second end plate (300).

[0209] Thirdly, the specific configuration of the heat dissipation fin (130) will be described below.

[0210] Fig. 23 is a drawing showing the heat dissipation fin shown in Fig. 16 and an enlarged view of a part thereof, and Fig. 24 is an exploded perspective view of Fig. 23.

[0211] Referring to FIGS. 23 and 24, a phase-changeable refrigerant may be filled inside the heat dissipation fin (130). The heat dissipation fin (130) may receive heat generated when the LED light source (115) emits light through the LED housing body (122), evaporate the refrigerant at the evaporation end (131) corresponding to the lower end of the heat dissipation fin (130), and diffuse the gaseous refrigerant upwards. In addition, the condensation end (132), which is the upper end excluding the evaporation end (131), may perform the function of radiating the heat of the gaseous refrigerant through heat exchange between the gaseous refrigerant diffused upwards and the outside air.

[0212] The heat dissipation fin (130) can be formed using a metal base material panel with excellent thermal conductivity so that heat received from multiple LED light sources (115) can be effectively exchanged with the outside air.

[0213] For example, the heat sink fin (130) may be formed by bending a single metal base panel so that the edge ends thereof are joined to each other, or may be formed so that the edge ends of two metal base panels are joined to each other.

[0214] At this time, the heat dissipation fin (130) may be filled with a phase-changeable refrigerant and form a refrigerant flow space (135) in which the refrigerant flows. The refrigerant flow space (135) may refer to the internal space of the heat dissipation fin (130). The refrigerant filled in the refrigerant flow space (135) may be formed as a refrigerant capable of phase-changing from a liquid state to a gaseous state by heat transferred from the LED light sources (115) to the evaporation end (131) through the LED housing body (122).

[0215] Here, the heat dissipation fin (130) can be formed into a shape that can expand the heat exchange surface area between the refrigerant that has been phase-changed into a gaseous state by heat transferred from the LED light source (115) and the outside air, and is preferably made of a metal material with excellent thermal conductivity.

[0216] The heat dissipation fin (130) may be formed of aluminum or an aluminum alloy, which are metal materials with excellent thermal conductivity and light weight. However, aluminum or an aluminum alloy, despite its excellent thermal conductivity, may have limited types of refrigerants that can be filled inside.

[0217] That is, when the heat dissipation fin (130) is formed of aluminum material or aluminum alloy material, it is preferable that the refrigerant that can be filled in the refrigerant flow space (130), which is the internal space of the heat dissipation fin (130), is formed in a way that does not chemically react with the aluminum material or aluminum alloy material.

[0218] However, when the refrigerant is formed of water, a rapid oxidation reaction (chemical reaction) occurs on the surface of the aluminum material or aluminum alloy material that comes into contact with the water, generating hydrogen, which may cause a problem in that the internal pressure of the refrigerant flow space (135) increases due to the generated hydrogen.

[0219] Therefore, when the refrigerant is formed of water, it is preferable that the heat dissipation fin (130) be formed of SUS (stainless steel), a material that hardly causes a chemical reaction with water.

[0220] That is, the refrigerant filled in the refrigerant flow space (135) of the heat dissipation fin (130) is formed of a phase-changeable material that is in a liquid state at room temperature and can be evaporated into a gaseous state by heat transferred from the LED light sources (115), but can be formed of a material that does not cause a chemical reaction when in surface heat contact with an aluminum material or an aluminum alloy material.

[0221] For reference, when the heat dissipation fin (130) is formed of aluminum or aluminum alloy, water must inevitably be excluded as a refrigerant to minimize the chemical reaction described above, and must be formed of an expensive refrigerant such as Honeywell refrigerant or other phase-changeable refrigerant that may cause environmental pollution.

[0222] The heat dissipation fin (130) forms a refrigerant flow space (135) by joining together along the edge ends of two SUS material metal base panels (130-1, 130-2) as shown in Fig. 24, and can be formed by joining so as to maintain airtightness with the outside to prevent leakage of the refrigerant filled in the refrigerant flow space (135).

[0223] Hereinafter, the heat dissipation fin (130) is defined as a one-side heat exchange panel (130-1) that forms one heat dissipation surface among two metal base panels (130-1, 130-2), and the other heat dissipation surface is defined as the other-side heat exchange panel (130-2).

[0224] One side heat exchange panel (130-1) and the other side heat exchange panel (130-2) are formed in an approximately rectangular shape, but have a shape in which, among the four vertices, the vicinity of the rear upper vertex or the vicinity of the front upper vertex is removed in a chamfered shape to form an inclined portion (134), and a tube insertion tube portion (137) into which an air vent tube (136) can be inserted and fixed can be formed protrudingly in the inclined portion (134).

[0225] The heat dissipation fin (130) can be fixed by a predetermined bonding method in a state where the evaporation end (131), which is the lower end based on the gravity direction, is inserted into the first pin bonding slot (122B) formed on the upper surface of the LED housing body (122), and the condensation end (132), which is the upper end based on the condensation direction, is inserted into the second pin bonding slot (145) formed on the lower surface of the heat dissipation guider (140). Here, the predetermined bonding method may include the epoxy treatment bonding method described above, as well as a general welding bonding method.

[0226] In addition, when defining the portion of the heat dissipation fin (130) excluding the evaporation portion (131) as the 'condensation portion (132)', the evaporation portion (131) is a portion corresponding directly below the condensation portion (132), and may be the lower portion based on the direction of gravity.

[0227] The refrigerant flow space (135) of the heat sink fin (130) may include a first refrigerant passage (135A), which is an internal space of the evaporation section (131). The first refrigerant passage (135A) may be a portion where the liquid refrigerant among the refrigerants filled therein is captured downward in the direction of gravity and then evaporated into a gaseous refrigerant by the heat of the LED housing (120) transferred to the evaporation section (131).

[0228] In other words, the first refrigerant passage (135A) can be defined as the internal space of the evaporation end (131) of the heat dissipation fin (130) located relatively lower with respect to the direction of gravity.

[0229] For reference, an absorber (not shown) for absorbing refrigerant may be further arranged in the first refrigerant passage (135A). The absorber can evenly distribute and retain the condensed liquid refrigerant collected in the first refrigerant passage (135A) throughout the first refrigerant passage (135A).

[0230] In addition, the refrigerant flow space (135) of the heat sink fin (130) may further include a plurality of second refrigerant passages (135B) formed in the internal space of the condensing section (132). When the refrigerant is evaporated into a gaseous refrigerant in the first refrigerant passage (135A) of the evaporating section (131) and then diffused throughout the internal space of the condensing section (132), and then condensed again while exchanging heat with the outside air, the plurality of second refrigerant passages (135B) may guide the condensed liquid refrigerant to be dispersed and collected in the first refrigerant passage (135A) of the evaporating section (131).

[0231] A plurality of second refrigerant passages (135B) may be formed so that adjacent second refrigerant passages (135B) are separated or partitioned by a plurality of refrigerant guides (138). The plurality of refrigerant guides (138) may be formed in a recessed shape toward the refrigerant flow space (135) on the outer surface of each of one side heat exchange panel (130-1) and the other side heat exchange panel (130-2).

[0232] The refrigerant flow space (135) of the heat sink fin (130) may further include a third refrigerant passage (135C) formed between adjacent second refrigerant passages (135B) among a plurality of second refrigerant passages (135B). The third refrigerant passage (135C) may be defined as a passage located between the thickness directions of a plurality of refrigerant guides (138).

[0233] The liquid refrigerant condensed through the condensing end (132) is induced to flow toward the first refrigerant passage (135A) on the lower side not only through the second refrigerant passage (135B) but also through the third refrigerant passage (135C), but can be mainly dispersed and moved toward the first refrigerant passage (135A) on the lower side through the second refrigerant passage (135B) by the surface tension or gravity of the liquid through the step portion formed by the refrigerant guide (138).

[0234] In addition, the vaporized refrigerant from the first refrigerant passage (135A) can diffuse and move to the entire condensing section (132) not only through the third refrigerant passage (135C) but also through the second refrigerant passage (135B). However, when the flow of liquid refrigerant is induced through the second refrigerant passage (135B), the vaporized refrigerant can mainly diffuse and move using the empty third refrigerant passage (135C) in between.

[0235] The one-side heat exchange panel (130-1) and the other-side heat exchange panel (130-2) having the above configuration can be joined by welding along the edge end so that the refrigerant flow space (135) is sealed.

[0236] Here, the heat dissipation fin (130) may further include a plurality of joints (139) that are formed to protrude inwardly toward the refrigerant flow space (135) on a plurality of refrigerant guides (138) among one side heat exchange panel (130-1) and the other side heat exchange panel (130-2). The plurality of joints (139) may facilitate mutual jointing of the one side heat exchange panel (130-1) and the other side heat exchange panel (130-2).

[0237] When a plurality of joints (139) formed on one side heat exchange panel (130-1) and a plurality of joints (139) formed on the other side heat exchange panel (130-2) are mutually joined through a joint including a welding method in the refrigerant flow space (135), the mutual joint strength of the one side heat exchange panel (130-1) and the other side heat exchange panel (130-2) is improved, so that not only can the internal pressure that changes during the phase change process of the refrigerant in the refrigerant flow space (135) be withstood, but also the shaking phenomenon of the one side heat exchange panel (130-1) and the other side heat exchange panel (130-2) due to the internal pressure is prevented, thereby minimizing the consumption of energy consumed to the outside of the heat dissipation fin (130) and preventing the heat dissipation performance from being deteriorated.

[0238] However, the second refrigerant passage (135B), the third refrigerant passage (135C), the refrigerant guide (138), and the joint (139) do not necessarily have to be formed in the condensing section (132) of the above-described heat dissipation fin (130). That is, as long as the circulation of the refrigerant is ensured, in which the refrigerant evaporated in the evaporating section (131) moves to the condensing section (132) and the refrigerant condensed in the condensing section (132) moves to the evaporating section (131), the second refrigerant passage (135B), the third refrigerant passage (135C), the refrigerant guide (138), and the joint (139) do not necessarily have to be formed.

[0239] Meanwhile, the specific configuration of the first end plate (200) and the second end plate (300) that are respectively connected to the front and rear ends of the multiple LED assemblies (100) will be described below.

[0240] FIG. 25 is a drawing showing the first end plate shown in FIG. 13, FIG. 26 is a drawing showing the second end plate shown in FIG. 13, FIG. 27 is a rear perspective view of FIG. 26, FIG. 28 is an exploded perspective view of FIG. 26, and FIG. 29 is a rear perspective view of FIG. 28.

[0241] Referring to FIGS. 25 to 29, as described above, the upper portion of the first end plate (200) can be fastened to the front end, which is one end of the heat dissipation tip portion (142), via a spiral fastening member (210), and the lower portion of the first end plate (200) can be fastened to the front end, which is one end of the LED housing (120), via a spiral fastening member (220). In addition, the upper portion of the second end plate (300) can be fastened to the rear end, which is the other end of the heat dissipation tip portion (142), via a spiral fastening member (310), and the lower portion of the second end plate (300) can be fastened to the rear end, which is the other end of the LED housing (120), via a spiral fastening member (320).

[0242] A first mounting strap (13) can be coupled to the upper end of the first end plate (200), and a second mounting strap (14) can be coupled to the upper end of the second end plate (300). Here, the first mounting strap (13) and the second mounting strap (14) have similar functions to the first mounting bracket (11) and the second mounting bracket (12) of the plant cultivation lighting device (1) according to the first embodiment of the present invention, and can be installed in one of the horizontal transport module and the vertical transport module described in the plant cultivation lighting device (1) according to the first embodiment of the present invention. That is, the first mounting strap (13) and the second mounting strap (14) may be configured to connect the lighting device for plant cultivation according to the second embodiment of the present invention to one of the horizontal transport module and the vertical transport module, so that the lighting device for plant cultivation according to the second embodiment of the present invention (2) is transported in the horizontal direction and the vertical direction within the cultivation housing by the operation of the horizontal transport module and the vertical transport module.

[0243] Both ends of the first mounting strap (13) can be connected to the upper end of the first end plate (200) through a pair of ring members each connected to a pair of holes formed in the upper end of the first end plate (200).

[0244] Both ends of the second mounting strap (14) can be connected to the upper end of the second end plate (300) through a pair of ring members each connected to a pair of holes formed in the upper end of the second end plate (300).

[0245] A first external air inlet (250) may be formed in the first end plate (200), and a second external air inlet (350) may be formed in the second end plate (300) at a position corresponding to the first external air inlet (250). The first external air inlet (250) may be formed on the upper portion of the first end plate (200), and the second external air inlet (350) may be formed on the upper portion of the second end plate (300).

[0246] The first external air inlet (250) and the second external air inlet (350) may be formed in a portion corresponding to the heat dissipation fin (130) of the LED assembly (100). External air may be supplied to the heat dissipation fin (130) through the first external air inlet (250) and the second external air inlet (350), thereby improving the heat dissipation performance of the heat dissipation fin (130). The first external air inlet (250) and the second external air inlet (350) may be formed to be open from front to back.

[0247] The second end plate (300) may have a distribution box (30) installed on the lower rear side so as to protrude rearward. The distribution box (30) may be formed in a rectangular shape. A power connector (31) connected to the power connector of the power supply device via a power cable may be formed protruding on the upper surface of the distribution box (30). Inside the distribution box (30), a distribution board (not shown) may be provided to supply electricity to a plurality of LED light sources (115) by supplying electricity to an LED board (110) provided in each of a plurality of LED assemblies (100).

[0248] In this embodiment, since the plurality of LED assemblies (100) are arranged lengthwise in the front-back direction, the distribution box (30) is installed at the lower rear portion of the second end plate (300), but the distribution box (30) may also be installed at the lower front portion of the first end plate (200).

[0249] The distribution box (30) may include a box body (32), a box cover (34), and a gasket (36).

[0250] The box body (32) may be formed in a rectangular shape having an opening at the front and rear and an opening at the receiving space (33). The distribution board may be received in the receiving space (33) of the box body (32). The opened front of the box body (32) may be covered by the lower portion of the second end plate (300), and the opened rear of the box body (320) may be covered by a box cover (34).

[0251] The gasket (36) is formed in a square ring shape and can seal the rear edge of the box body (32) and the front edge of the box cover (34). A plurality of through holes (36A) can be formed in the gasket (36), and a plurality of spiral fastening members (34A) can penetrate the plurality of fastening holes formed in the edge of the box cover (34), respectively. After the plurality of spiral fastening members (34A) penetrate the plurality of through holes (36A) formed in the gasket (36), they are respectively fastened to the plurality of fastening grooves formed in the rear edge of the box body (32), whereby the box cover (34) can be fastened to the box body (32), and the gasket (36) can seal the rear edge of the box body (32) and the front edge of the box cover (34).

[0252] Meanwhile, a plurality of LED assemblies (100) may have a power terminal (125, see FIG. 14) protrudingly formed on the rear surface of each LED housing (120), and a through hole (305) through which the power terminal (125) passes may be formed on the lower portion of the second end plate (300). The power terminal (125) may be inserted into the interior of the distribution box (30) through the through hole (305) and connected to the distribution board.

[0253] The through holes (305) can be formed in the same number as the number of LED assemblies (100). In the present embodiment, since the LED assemblies (100) are provided in six pieces as shown in FIGS. 11 to 14, six through holes (305) can be formed in the lower portion of the second end plate (300).

[0254]

[0255] As described above, the lighting device (1, 2) for plant cultivation according to embodiments of the present invention can reduce the weight of the entire product because it includes an LED assembly (100) in which the lower end of a heat dissipation fin (130) is coupled to an LED housing (120) in which an LED substrate (110) is accommodated inside, and because the blower fan (410) placed on the upper side of the LED assembly (100) blows air downward, it can improve heat dissipation performance and be used as a heater.

[0256] In addition, in the plant cultivation lighting device (1, 2) according to the embodiments of the present invention, when the LED assembly (100) is equipped with a plurality of LED assemblies (100), when some of the LED assemblies (100) malfunction or fail, only the corresponding LED assembly (100) can be easily replaced.

[0257]

[0258] Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical concept or essential characteristics thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims that follow rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

[0259]

[0260] The present invention provides a lighting device for plant cultivation that can be used as a heater and improves heat dissipation performance by using a blower fan.

Claims

1. An LED assembly including an LED substrate having a plurality of LED light sources that generate light, an LED housing that distributes light from the plurality of LED light sources, and a heat dissipation fin having a lower end joined to the LED housing; and A lighting device for plant cultivation, comprising a blower fan positioned on the upper side of the LED assembly and blowing air downward.

2. In claim 1, A lighting device for plant cultivation in which a refrigerant flow space in which refrigerant flows is formed inside the above heat dissipation fin.

3. In claim 2, The above heat dissipation fin is formed of a material including stainless steel, The above refrigerant is a plant cultivation lighting device formed of water.

4. In claim 2, On the above LED substrate, the plurality of LED light sources are arranged in the longitudinal direction, The above heat dissipation fin is formed with a length corresponding to the length of the LED substrate, A plant cultivation lighting device having a first pin coupling slot formed on the upper surface of the LED housing into which the lower part of the heat dissipation fin is inserted.

5. In claim 4, A plant cultivation lighting device in which the lower part of the above heat dissipation fin is fixed to the LED housing through welding or epoxy while being inserted into the first pin coupling slot.

6. In claim 1, The above LED housing, The LED housing cover through which the light is transmitted, A lighting device for plant cultivation, comprising an LED housing body that is combined with the LED housing cover, the lower part of the heat dissipation fin is combined, and is formed of a metal material that does not transmit light and transmits heat to the heat dissipation fin.

7. In claim 6, A plant cultivation lighting device in which a pair of joining grooves are formed on the lower surface of the LED housing body, into which the left and right sides of the LED housing cover are inserted and joined respectively.

8. In claim 1, A first housing having at least a portion of the LED assembly disposed therein and having an open lower surface and an open upper surface; A lighting device for plant cultivation, further comprising a second housing having the blower fan disposed therein and covering a portion of the opened upper surface of the first housing.

9. In claim 8, A lighting device for plant cultivation, wherein a border joining rib is formed at the lower end of the second housing and is inserted into the open upper surface of the first housing and joined to the inner peripheral edge of the upper end of the first housing.

10. In claim 1, The LED assembly is a plant cultivation lighting device including a plurality of LED assemblies spaced apart from each other in the direction of both sides of the heat dissipation fins.

11. In claim 1, The LED assembly is a plant cultivation lighting device further comprising a heat dissipation guider coupled to the upper end of the heat dissipation fin and having a plurality of heat dissipation protrusions formed on both sides of the heat dissipation fin in the opposite direction.

12. In claim 11, At the top of the above heat dissipation guider, a heat dissipation tip portion having a circular cross-section and extending in the longitudinal direction of the heat dissipation guider is formed, A lighting device for plant cultivation further comprising a fan bracket that supports the blower fan and has a tip portion joining groove formed into which the heat dissipation tip portion is inserted and joined.

13. In claim 11, A lighting device for plant cultivation in which the plurality of heat dissipation protrusions are formed so as to be inclined toward the lower side as they go outward in the direction of both sides of the heat dissipation fins and extend in the longitudinal direction of the heat dissipation guider.

14. In claim 11, A plant cultivation lighting device in which a second pin coupling slot is formed in the above heat dissipation guide into which the upper part of the heat dissipation fin is inserted.

15. In claim 11, A first end plate, which is connected at one end of the heat dissipation tip portion through a spiral fastening member at its upper end and at one end of the LED housing through a spiral fastening member at its lower end, and is placed at one end of the LED assembly; A lighting device for plant cultivation further comprising a second end plate, the upper end of which is fastened to the other end of the heat dissipation tip portion through a spiral fastening member, and the lower end of which is fastened to the other end of the LED housing through a spiral fastening member, and is placed at the other end of the LED assembly.

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