Abstract:
Disclosed is an LED lighting device of which the number of LED modules thereof is changeable according to power consumption. Through a structural change of the module, heat radiation and waterproof can be greatly improved and the size, weight and manufacturing cost can be reduced. Also, a fastening bolt allows the module to be simply attached and separated and maintenance, repair and stability can be improved by providing a wiring space inside the device. Further, there is an advantage of additionally adding a light detection sensor through a cover. The LED lighting device according to the embodiment includes a plurality of heat radiating plates; at least one light source module disposed on one surface of the heat radiating plate.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation Application of U.S. application Ser. No. 13/371,121 filed Feb. 10, 2012, which claims priority from Korean Application Nos. 10-2011-0012514 filed on Feb. 11, 2011, 10-2011-0018403 filed on Mar. 2, 2011, 10-2011-0018404 filed on Mar. 2, 2011, and 10-2011-0033607 filed on Apr. 12, 2011, the subject matters of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Field 
     Embodiments may relate to a light emitting diode (LED) lighting device. 
     2. Background 
     In general, a light emitting diode (LED) is a semiconductor light emitting device which emits light when electric current flows. The LED includes a PN junction diode composed of a photo-semiconductive material such as GaAs, GaN. The area of light emitted from the LED ranges from a red area (630 nm to 700 nm) to a blue-violet area (400 nm) and includes blue, green and white areas as well. 
     The LED has a lower power consumption, high efficiency, a long operating life span and the like as compared with a conventional lighting such as an incandescent electric lamp and a fluorescent lamp. Therefore, demands for the LED are now continuously increasing. Recently, the LED is now being applied to a wider range including an outdoor lighting device, for example, a small-sized lighting of a mobile terminal, a vehicle lighting, an indoor lighting, an outdoor signboard and a street lamp. 
     When it comes to a prior LED street lamp, an LED module has been designed and manufactured according to power consumption. Therefore, there has been a disadvantage in that the LED module should be differently manufactured according to various power consumptions. 
     The prior LED street lamp has a large size, heavy weight and a high price. For example, the prior LED street lamp has a size of 1250×300×93 and its weight of 17 kg. 
     Also, the prior LED street lamp has a poor heat radiating characteristic and a poor waterproof effect. For example, the prior LED street lamp has been measured to have a thermal conductivity of about 2.5° C./W. 
     SUMMARY 
     Provided is an LED lighting device of which the number of LED modules thereof is changeable according to power consumption. 
     Provided is the LED lighting device of which the size, weight and manufacturing cost are reducible. 
     Provided is the LED lighting device having improved heat radiation. 
     Provided is the LED lighting device having improved waterproof. 
     Provided is the LED lighting device having waterproof improved by introducing a fluid or air. 
     Provided is the LED lighting device including the module which is simply attached and separated by a fastening bolt. 
     Provided is the LED lighting device having improved maintenance, repair and stability by providing a wiring space within the device. 
     Provided is the LED lighting device providing a cover in which a light detection sensor is disposed. 
     One embodiment is a lighting device. The lighting device may include: a plurality of heat radiating plates; at least one light source module disposed on one surface of the heat radiating plate; a cover disposed on the other surface of the heat radiating plate; two side frames, each of which is disposed on a right side and a left side of the heat radiating plate respectively; a cap disposed on a top side of the heat radiating plate, and coupled to one end of the side frame; and a support frame disposed on a bottom side of the heat radiating plate, and coupled to the other end of the side frame. 
     In the LED lighting device, the plurality of heat radiating plates may be arranged in contact with each other in a longitudinal direction of the side frame. 
     In the LED lighting device, the light source module may comprise at least one light emitting device. 
     In the LED lighting device, the cover may include a plurality of holes penetrating through both sides thereof. 
     In the LED lighting device, the lathing emitting device may include at least one of a colored LED chip, a white LED chip or an UV chip. 
     The light source module may include: a clad metal layer; an insulating structure which is disposed on the clad metal layer; a light emitting module which is disposed on the insulating structure and includes a plurality of light emitting device; a lens structure which is disposed on the light emitting module; a packing structure which is disposed on the lens structure; and a case which is disposed on the packing structure and is coupled to the clad metal layer. 
     The case may include a first opening portion through which light which has passed through the lens structure is emitted. The case may include a plurality of heat radiating fins disposed on the outer surface thereof. 
     The lens structure may be disposed to have a dome shape over the light emitting device and may include at least one of a yellow fluorescent material, a green fluorescent material or a red fluorescent material. 
     The LED lighting device may further include a heat radiating plate is disposed under the light emitting module. The heat radiating plate comprises one of a thermal conduction silicon pad or a thermal conductive tape. 
     The heat radiating plate may include: a plate-shaped base; a plurality of heat radiating fins extending upwardly from the base; and a least one of hole disposed between the plurality of heat radiating fins. 
     In the heat radiating plate, one side of the base may be inclined in a longitudinal direction of the heat radiating fin. One or a plurality of the light source modules may be disposed on a side opposite with the side on which the heat radiating fin is disposed. The heat radiating plate may be disposed of at least any one selected from the group consisting of Cu, Ag, Au, Ni, Al, Cr, Ru, Re, Pb, Cr, Sn, In, Zn, Pt, Mo, Ti, Ta, W and Mg, or is disposed of an alloy including the metallic materials. 
     The side frame may include: a lower member; an upper member spaced apart from the lower member; at least one connecting member which connects the lower member with the upper member; and a second opening portion partitioned by the upper member, the lower member and the connecting member. 
     A portion of the top surface of the lower member may be inclined perpendicular to the longitudinal direction of the lower member with respect to the bottom surface of the lower member. A plurality of grooves may be disposed in the top surface of the lower member perpendicularly to the longitudinal direction of the lower member. 
     The LED lighting device may include at least one duct which is adjacent to the heat radiating plate and is disposed on the lower member of the side frame in the longitudinal direction of the side frame. Here, the duct may include a base and an extension part extending upwardly from both ends of the base and including a hole at one end of the extension part. 
     The support frame may include: a lower support frame which is coupled to the upper support frame, includes an inner space in which the power controller is disposed and includes a third opening portion corresponding to the inner space; a flange which is fastened and coupled to the opening of the lower support frame; and a packing which is disposed between the upper support frame and the lower support frame. 
     The LED lighting device may include a heat radiation sheet or a thermal pad between the light source module and the heat radiating plate. 
     The LED lighting device may further include a power controller which is disposed inside the support frame and controls the supplying of electric power to the light source module. 
     The lighting device using the light emitting device according to the embodiment can be configured by controlling the number of the LED modules according to power consumption, so that the lighting device can be used to implement various products. 
     As compared with a conventional LED lighting device, the lighting device according to the embodiment has reduced size, weight and manufacturing cost. 
     The lighting device according to the embodiment is able to greatly improve heat radiation by obtaining high efficiency heat radiation and high efficiency thermal conductivity through restructuring. 
     In the lighting device according to the embodiment, it is possible to greatly improve waterproof by applying a waterproof connector and by introducing a fluid or air. 
     In the lighting device according to the embodiment, it is possible to simply attach and remove the module by means of a fastening bolt. 
     In the lighting device according to the embodiment, it is possible to improve maintenance, repair and stability by providing a wiring space within the device. 
     The lighting device according to the embodiment can be applied to various products by providing a cover in which a light detection sensor is disposed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Arrangements and embodiments may be described in detail with reference to the following drawings in which like reference numerals refer to like elements and wherein: 
         FIG. 1  is a perspective view of a lighting device according to an embodiment; 
         FIG. 2  is an exploded perspective view of the lighting device; 
         FIG. 3  is a perspective view of a light source module according to the embodiment; 
         FIG. 4  is an exploded perspective view of the light source module; 
         FIG. 5  is a perspective view of a heat radiating plate according to the embodiment; 
         FIG. 6  is a perspective view of the light source module according to the embodiment; 
         FIG. 7  is a perspective view of a side frame according to the embodiment; 
         FIG. 8  is a perspective view showing a duct according to the embodiment and the surroundings of the duct; and 
         FIG. 9  is an exploded perspective view of a support frame according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     A thickness or size of each layer is magnified, omitted or schematically shown for the purpose of convenience and clearness of description. The size of each component does not necessarily mean its actual size. 
     It will be understood that when an element is referred to as being ‘on’ or “under” another element, it can be directly on/under the element, and one or more intervening elements may also be present. When an element is referred to as being ‘on’ or ‘under’, ‘under the element’ as well as ‘on the element’ can be included based on the element. 
     Hereafter, detailed technical characteristics to be embodied will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a lighting device according to an embodiment.  FIG. 2  is an exploded perspective view of the lighting device. 
     The lighting device according to the embodiment includes, as shown in  FIGS. 1 and 2 , a light source module  1000 , a heat radiating plate  2000 , a side frame  3000 , a cover  4000 , a support frame  5000 , a power controller  6000 , a cap  7000  and a duct  8000 . 
     The lighting device includes the light source module  1000  including a plurality of light emitting device and includes the heat radiating plate  2000  for radiating heat generated from the light emitting device. Here, the light emitting device may include a colored LED chip, a white LED chip or an UV chip. 
     The number of the light source modules  1000  which are included in the lighting device is controlled according to the power consumption of the lighting device. According to the embodiment shown in the drawings, it is shown that two light source modules  1000  are disposed in one heat radiating plate  2000 , and four heat radiating plates  2000  are provided to the lighting device. 
     The light source module  1000  is disposed on the front of the heat radiating plate  2000 . The cover  4000  is disposed on the rear of the heat radiating plate  2000 . The side frame  3000  supporting the heat radiating plate  2000  is disposed on the right and left of the heat radiating plate  2000 . 
     The one side of the side frame  3000  is coupled to the support frame  5000 . The other side of the side frame  3000  is coupled to the cap  7000 . The power controller  6000  is disposed inside the support frame  5000  and supplies electric power to the light source module  1000 . The duct  8000 , i.e., a power supply path for supplying power is disposed between the heat radiating plate  2000  and the side frame  3000 . 
     The heat radiating plate  2000  are, as shown in  FIG. 2 , separately disposed. A plurality of the light source modules  1000  may be disposed on one side of the heat radiating plate  2000  at an equal interval. As shown in  FIGS. 1 and 2 , a plurality of the heat radiating plate  2000  are coupled to each other according to the power consumption of the lighting device and may be arranged in a direction of side of the support frame  5000 . That is, one sides of the plurality of the heat radiating plate  2000  arranged to be in contact with each other are on the same plane. As a result, the plurality of the light source modules  1000  disposed on one side of each heat radiating plate  2000  are actually disposed at an equal interval on the same plane. 
     Subsequently, based on  FIGS. 1 and 2 , the cap  7000  is disposed on the heat radiating plate  2000 . The support frame  5000  is disposed under the heat radiating plate  2000 . The side frame  3000  is disposed on both sides of the heat radiating plate  2000 . When the lighting device is installed, the cover  4000  is disposed on the heat radiating plate  2000  and the light source module  1000  is disposed under the heat radiating plate  2000 . 
     Here, the cover  4000  is comprised of a body  4100  having a thin plate shape. The body  4100  includes a plurality of through-holes  4100   a  disposed therein. The cover  4000  functions to prevent external impurities from penetrating into the heat radiating plate  2000 . The through-hole  4100   a  allows the heat radiating plate  2000  to contact with the outside air and improves the heat radiating characteristic through air convection. 
     In case of rain, the lighting device according to the embodiment is configured to allow rainwater to pass through the through-hole  4100   a  of the cover  4000  and through holes (see reference numeral  2100   a  of  FIG. 6 ) of the heat radiating plate  2000  and to be freely discharged to the outside. Therefore, waterproof characteristics can be improved. 
     The size of the diameter of the through-hole  4100   a  of the cover  4000  may be disposed to be substantially the same as that of the diameter of the through-hole  2100   a  of the heat radiating plate  2000 . However, it is recommended that the size of the diameter of the through-hole  4100   a  of the cover  4000  should be smaller than that of the diameter of the through-hole  2100   a  of the heat radiating plate  2000 . This intends to prevent external impurities from penetrating through the through-hole  4100   a  of the cover  4000 . 
     In the disposition of the cover  4000  on the heat radiating plate  2000 , one side of the cover  4000  may be disposed in contact with heat radiating fins (see reference numeral  2300  of  FIG. 5 ) of the heat radiating plate  2000  in consideration of a heat radiating characteristic by conductivity. Further, the one side of the cover  4000  may be disposed apart from the heat radiating fins  2300  of the heat radiating plate  2000  at a regular interval in consideration of a heat radiating characteristic by convection with outside air. 
     The material of the cover  4000  may be the same as that of the heat radiating plate  2000  or may be a metallic material or a plastic material in order to reduce the weight of the cover  4000 . 
     The total size of the lighting device can be reduced by arranging structures such as the support frame  5000 , the heat radiating plate  2000  and the cap  7000  in the longitudinal direction of the lighting device. Also, since the heat radiating plate  2000 , the light source module  1000 , the side frame  3000 , the duct  8000  and the like are attachable and removable, they may be added or removed depending on the length of the lighting device. 
       FIG. 3  is a perspective view of a light source module according to the embodiment.  FIG. 4  is an exploded perspective view of the light source module. 
     As shown in  FIGS. 3 and 4 , the light source module  1000  may include a case  100 , a packing structure  200 , a lens structure  300 , a light emitting module  400  and an insulating structure  500 . The light source module  1000  may further include a clad metal layer  600 . 
     The case  100  forms a body of the light source module  1000  by being coupled and fixed to the clad metal layer  600  by means of a coupling means like a coupling screw (not shown), etc. Specifically, when the coupling screw passes through a through-hole “H 1 ” of the case  100  and is inserted into a coupling hole “H 2 ” of the clad metal layer  600 , the case  100  and the clad metal layer  600  may be coupled and fixed to each other. 
     The case  100  may be coupled to or separated from the clad metal layer  600  by use of the coupling screw. Therefore, when the light source module  1000  is broken, the light source module  1000  can be maintained and repaired by inserting or removing the coupling screw. Although the embodiment shows the case  100  has a circular shape, the case  100  may have various shapes including the circular shape. 
     The light source module  1000  receives and protects the packing structure  200 , the lens structure  300 , the light emitting module  400  and the insulating structure  500 , all of which are located between the case  100  and the clad metal layer  600 . 
     The case  100  includes a first opening portion (G) through which light which has passed through the lens structure  300  is outwardly emitted. Therefore, the lens structure  300  is exposed outward through the first opening portion (G). It is recommended that the case  100  should be made of a thermal conductive material in order to radiate heat from the light emitting module  400 . For example, the case  100  may be made of a metallic material, specifically, made of at least one of Al, Ni, Cu, Au, Sn, Mg and stainless steel. Also, the outer surface of the case  100  may include a plurality of heat radiating fins  110  radiating the heat from the light emitting module  400 . Since the heat radiating fins  110  increase the surface area of the case  100 , the case  100  is able to more effectively radiate the heat. 
     The packing structure  200  is disposed between the case  100  and the lens structure  300 , and prevents water and impurities from penetrating through the light emitting module  400 . It is recommended that the packing structure  200  should be made of an elastic material, lest water should penetrate through the packing structure  200 . For example, waterproof rubber, a silicone material or the like can be used as a material of the packing structure  200 . The packing structure  200  may have a circular ring shape in such a manner as to be disposed on an outer frame  330  of the lens structure  300 . When the packing structure  200  is disposed on the lens structure  300 , the case  100  presses the packing structure  200 . Therefore, the packing structure  200  fills a space between the case  100  and the lens structure  300 , thereby stopping water and impurities from penetrating through the light emitting module  400  through the first opening portion (G) of the case  100 . Accordingly, the reliability of the light source module can be improved. 
     The lens structure  300  is disposed on the light emitting module  400  and optically controls light emitted from the light emitting module  400 . The lens structure  300  includes a lens  310  and an outer frame  330 . The lens structure  300  may be injection-molded by use of a light transmitting material. The light transmitting material can be implemented by a plastic material such as glass, poly methyl methacrylate (PMMA), polycarbonate (PC) and the like. 
     A plurality of lenses  310  are disposed on the top surface of the lens structure  300 . The lens  310  may have a dome shape. The lens  310  controls light incident from the light emitting module  400 . Here, the control of the light means a diffusion or collection of the light incident from the light emitting module  400 . When the light emitting device  430  of the light emitting module  400  is a light emitting diode, the lens  310  is able to diffuse the light from the light emitting device  430 . Besides, the lens  310  is also able to collect the light from the light emitting module  400  instead of diffusing. The lens  310  may one-to-one correspond to the light emitting device  430  of the light emitting module  400 . The lens  310  may include a fluorescent material (not shown). 
     The fluorescent material may include at least one of a yellow fluorescent material, a green fluorescent material or a red fluorescent material. Particularly, when the light emitting device  430  of the light emitting module  400  is a blue light emitting diode, the lens  310  may include at least one of the yellow, green and red fluorescent materials. Thus, thanks to the fluorescent material included in the lens  310 , a color rendering index (CRI) of light emitted from the light emitting device  430  can be improved. 
     The packing structure  200  is disposed on the outer frame  330  of the lens structure  300 . For this purpose, the outer frame  330  may have a flat shape allowing the packing structure  200  to be entirely seated on the outer frame  330 . However, the outer frame  330  may be inward or outward inclined without being limited to this. When the packing structure  200  includes a predetermined recess, the outer frame  330  may include a projection (not shown) which is fitted into and coupled to the predetermined recess. As such, the outer frame  330  has various types of embodiments allowing the packing structure  200  to be easily mounted thereon. 
     It is desirable that the outer frame  330 , together with the case  100 , should be configured to press the packing structure  200 . In this case, it is possible to protect the light emitting module  400  from water or impurities by preventing the water or impurities from being introduced between the outer frame  330  and the packing structure  200 . 
     The outer frame  330  may cause the lens  310  and the light emitting device  430  of the light emitting module  400  to be spaced from each other at a regular interval. The outer frame  330  may form a space between the lens  310  and the light emitting device  430 . This is because when the light emitting device  430  of the light emitting module  400  is a light emitting diode, a regular interval is required between the light emitting module  400  and the lens  310  in order to obtain a desired light distribution. For example, light emitted from the light emitting diode  430  may have a light distribution angle of approximately 120°. 
     The light emitting module  400  is disposed on the clad metal layer  600  and under the lens structure  300 . The light emitting module  400  includes, as shown in  FIG. 4 , a substrate  410  and a plurality of the light emitting devices  430  disposed on the substrate  410 . The substrate  410  may have a disc shape. However, the shape of the substrate  410  is not limited to this. 
     The substrate  410  may be disposed by printing a circuit on an insulator and may include an aluminum substrate, a ceramic substrate, a metal core PCB or a common PCB. The plurality of the light emitting devices  430  are disposed on one side of the substrate  410 . The one side of the substrate  410  may have a color capable of efficiently reflecting light, for example, white color. 
     Here, the plurality of the light emitting devices  430  may be disposed on the substrate  410  in the form of an array. The shape and the number of the plurality of the light emitting devices  430  may be variously changed according to needs. The light emitting device  430  may be a light emitting diode (LED). At least one of a red LED, a blue LED, a green LED or a white LED may be selectively used as the light emitting device  430 . The light emitting device  430  may be variously transdisposed. 
     The substrate  410  may further include a DC converter, a protective device (circuit) or the like. The DC converter converts AC to DC and supplies the DC. The protective device protects the lighting device from ESD, a Surge phenomenon or the like. 
     A heat radiating plate (not shown) may be attached to the bottom surface of the substrate  410 . The heat radiating plate (not shown) may efficiently transfer the heat generated from the light emitting module  400  to the clad metal layer  600 . The heat radiating plate (not shown) may be disposed of a material having thermal conductivity. For example, the heat radiating plate may be a thermal conduction silicon pad or a thermal conductive tape. 
     The insulating structure  500  surrounds the outer circumferential surface of the light emitting module  400 . To this end, the insulating structure  500  may have a ring shape in accordance with the shape of the light emitting module  400 . Although the embodiment shows that the insulating structure  500  has a ring shape, there is no limit to the shape of the insulating structure  500 . The insulating structure  500  is made of an insulation material, for example, a rubber material or a silicone material. Therefore, the insulating structure  500  functions to electrically protect the light emitting module  400 . That is, the insulating structure  500  electrically insulates the light emitting module  400 , the clad metal layer  600  and the case  100  from each other. Therefore, a withstand voltage can be increased and the reliability can be improved. The insulating structure  500  is also able to prevent water or impurities from being introduced into the light emitting module  400 . 
     The clad metal layer  600  is disposed by combining a plurality of heterogeneous metal layers. The clad metal layer  600  is disposed under the light emitting module  400  and may be coupled to the case  100 . Therefore, the clad metal layer  600  is able to radiate heat from the light emitting module  400  by itself or transfer the heat to the case  100 . The clad metal layer  600  may be configured to come in direct or indirect contact with the bottom surface of the light emitting module  400 . When the clad metal layer  600  comes in indirect contact with the bottom surface of the substrate  410  of the light emitting module  400 , it means that the heat radiating plate (not shown) is disposed on the bottom surface of the substrate  410 . 
       FIG. 5  is a perspective view of a heat radiating plate according to the embodiment.  FIG. 6  is a perspective view of the light source module according to the embodiment. 
     The heat radiating plate  2000  includes, as shown in  FIGS. 5 and 6 , a base  2100  and a plurality of the heat radiating fins  2300  extending from one side of the base  2100 . The base  2100  may include one or more through-holes  2100   a  disposed in an area thereof between the heat radiating fins  2300 . For example, the through-hole  2100   a  may be disposed in an area around the light source module  1000  disposed on the other side of the base  2100 . 
     The heat radiating plate  2000  is able to radiate heat generated from the light source module  1000  by itself. Also, at least one through-hole  2100   a  disposed in the base  2100  of the heat radiating plate  2000  is able to more improve the heat radiating characteristic by radiating the heat generated from the light source module  1000  by convection with outside air. 
     The through-hole  2100   a  allows fluid like rainwater to pass through the heat radiating plate  2000  thereby improving waterproof characteristics. 
     The base  2100  of the heat radiating plate  2000 , as shown in  FIG. 5 , may include a top surface  2101  and a bottom surface  2102 . The bottom surface  2102  may be inclined at a predetermined angle with respect to the flat top surface  2101 . That is, one side of the base  2100  is inclined at a predetermined angle. Here, the inclined direction of the one side of the base  2100  corresponds to the longitudinal direction of the heat radiating fin  2300 , which allows fluid in case of rain to flow along the right and left edges of the heat radiating plate. The fluid flowing along the edges is discharged to the outside through a second opening portion (see “G 1 ” of  FIG. 7 ) disposed in the side frame  3000  disposed on the right and left of the heat radiating plate  2000 . 
     The heat radiating plate  2000  may be disposed of a thermal conductive material in order to radiate heat from the light source module  1000 . For example, the case  100  may be disposed of a metallic material. For instance, the case  100  may be disposed of at least any one selected from the group consisting of Cu, Ag, Au, Ni, Al, Cr, Ru, Re, Pb, Cr, Sn, In, Zn, Pt, Mo, Ti, Ta, W and Mg, or may be disposed of an alloy including the metallic materials. 
     Meanwhile, though not shown in the drawing, a heat radiation sheet or a thermal pad may be interposed between the light source module  1000  and the heat radiating plate  2000 . 
       FIG. 7  is a perspective view of a side frame according to the embodiment.  FIG. 8  is a perspective view showing a duct according to the embodiment and the surroundings of the duct. 
     The side frame  3000  includes, as shown in  FIG. 7 , a lower member  3100 , an upper member  3300  spaced apart from the lower member  3100 , and at least one connecting member  3200  which connects the lower member  3100  with the upper member  3300 . The side frame  3000  includes the second opening portion (G 1 ) partitioned by the upper member  3300 , the lower member  3100  and the connecting member  3200 . The second opening portion (G 1 ) has the same direction as that of the space between the plurality of the heat radiating fins  2300  of the heat radiating plate  2000 . Accordingly, the second opening portion (G 1 ) functions as a path for outwardly discharging the fluid flowing out from the heat radiating plate  2000 . 
     The side frame  3000  is disposed at the side of the heat radiating plate  2000 . The end of the heat radiating plate  2000  is disposed on the lower member  3100  of the side frame  3000 , so that the side frame  3000  is coupled to the heat radiating plate  2000 . 
     Also, one side of the side frame  3000  is screw fastened (not shown) to the support frame  5000 . The other side of the side frame  3000  is screw fastened to the cap  7000 . As a result, the shape of the lighting device is implemented. 
     The size of the side frame  3000  is maintained as large as the size (height) of the heat radiating plate  2000  disposed within the side frame  3000 , so that the entire lighting device can be thinner. A height from the top to the bottom of the side frame  3000  may be greater than a height from the top to the bottom of the heat radiating plate  2000  so as to stably surround the entire heat radiating plate  2000 . 
     The side frame  3000  may be disposed of a metallic material with rigidity to support the heat radiating plate  2000 . However, the side frame  3000  may be disposed of a plastic material such as glass, poly methyl metacrylate (PMMA), polycarbonate (PC) or the like in order not only to allow the side frame  3000  to be more easily injection-molded but also to reduce the weight of the lighting device like a street lamp when the side frame  3000  is used in the lighting device. 
     A portion of the top surface of the lower member  3100  of the side frame  3000  may be inclined with respect to the bottom surface of the lower member  3100 . Here, the inclined direction may be perpendicular to the longitudinal direction of the lower member  3100 . Accordingly, the fluid flowing out from the heat radiating plate  2000  can be more easily discharged outwardly. 
     The top surface of the lower member  3100  may have a plurality of grooves  3100   a  in the inclined direction of the lower member  3100 . In other words, the groove  3100   a  may be disposed in the top surface of the lower member  3100  in a direction perpendicular to the longitudinal direction of the lower member  3100 . Here, one groove  3100   a  or the plurality of the grooves  3100   a  may be disposed in each second opening portion (G 1 ) of the side frame  3000 . 
     The duct  8000  has, as shown in  FIG. 8 , an open upper portion, a base  8100  and an extension part  8300  which extends upwardly from both ends of the base  8100 . 
     The duct  8000  may be provided in a single form adjacent to the heat radiating plate  2000  and disposed on the lower member  3100  of the side frame  3000 . In addition, a plurality of the ducts  8000  may be provided and combined with or separated from each other in such a manner that the length of the duct  8000  may be changed depending on the increase or decrease of the light source module  1000 . 
     One side of the extension part  8300  of the duct  8000  includes a hole  8100   a  functioning as a path for a power cable (not shown) for supplying electric power to the light source module  1000 . The duct  8000  is adjacent to the heat radiating plate  2000  and is disposed on the lower member  3100  of the side frame  3000  in the longitudinal direction of the side frame  3000 . That is to say, the heat radiating plate  2000 , the duct  8000  and the side frame  3000  are disposed in the order specified, and the connecting member  3200  of the side frame  3000  supports closely the lateral side of the duct  8000 . 
     Here, a constant gap may be disposed between the duct  8000  and the heat radiating plate  2000 . This intends that the fluid flowing on the heat radiating plate  2000  passes through the second opening portion (G 1 ) or the groove  3100   a  of the side frame  3000  along the gap between the duct  8000  and the heat radiating plate  2000 , and then is discharged to the outside. 
     When the duct  8000  is disposed to the side frame  3000 , it is recommended that the height of the duct  8000  should be equal to or less than the height of the base  2100  of the heat radiating plate  2000 . 
       FIG. 9  is an exploded perspective view of a support frame according to the embodiment. 
     The support frame  5000  includes, as shown in  FIG. 9 , an upper support frame  5100  and a lower support frame  5500 . 
     The lower support frame  5500  includes an inner space in which the power controller  6000  is disposed and includes a third opening portion (G 2 ) corresponding to the inner space. The third opening portion (G 2 ) allows the power controller  6000  to be easily maintained and repaired. After the power controller  6000  is disposed, the third opening portion (G 2 ) is covered with and protected by a flange  5200 . The flange  5200  is fastened and coupled to a screw (not shown) of the lower support frame  5500 . 
     Additionally, a packing  5300  is disposed in the inner space such that the lower support frame  5500  is stably and closely coupled to the upper support frame  5100 . 
     The support frame  5000  may have any shape allowing the power controller  6000  to be disposed thereinside. Here, it is desirable that the power controller  6000  should be disposed close to the light source module  1000  disposed in the heat radiating plate  2000 . This is because it is possible to prevent voltage drop caused by a distance between the power controller  6000  and the light source module  1000 . 
     Although embodiments of the present invention were described above, these are just examples and do not limit the present invention. Further, the present invention may be changed and modified in various ways, without departing from the essential features of the present invention, by those skilled in the art. For example, the components described in detail in the embodiments of the present invention may be modified. Further, differences due to the modification and application should be construed as being included in the scope and spirit of the present invention, which is described in the accompanying claims.