Patent Publication Number: US-8540397-B2

Title: Lighting apparatus using light emitting diode

Description:
TECHNICAL FIELD 
     The present invention relates to a lighting apparatus using light emitting diodes, and more particularly, to a lighting apparatus using a light emitting diode as a light source, which is designed to illuminate a wide range and be suitable for a light distribution type that is generally used to illuminate the road. 
     BACKGROUND ART 
     In general, streetlamps are lighting apparatuses that are installed along the road for safe road traffic, and various types of streetlamps are used according to the installation positions thereof, such as an expressway, main roads in the city, roads in a business section, and roads in a residence section. 
     The lighting apparatus includes a lamp housing that has a reflecting plate formed on the inner surface thereof and is mounted to a lamp post and a light source that is provided in the lamp housing to emit light. 
     The lamp posts are classified into various types, such as a highway type in which a lamp is attached to the end of a curved portion of a lamp post, a bracket type in which a lamp is attached to a branch horizontally extending a lamp post, and a column capital type in which a lamp is attached to the top of a lamp post. 
     In addition, a general lamp, such as a high-pressure sodium, metal halide, or a mercury vapor, is used as the light source. 
     The streetlamp emits predetermined color light, such as white, yellow, or blue light, according to the type of light source provided therein. Of course, the color of light emitted from the streetlamp may be selected according to, power efficiency, light intensity, or the surrounding environment. 
     Meanwhile, the streetlamp is designed to have a shape capable of most effectively illuminating the road with a suitable light distribution type when it is installed on the road. As shown in  FIG. 1 , first to five light distribution types are generally used to illuminate the road. Except for some special cases, the second to fourth light distribution types can effectively illuminate most of the road. 
     In the streetlamp according to the related art, the reflection angle of a reflecting plate provided in a lamp housing is adjusted to illuminate the road with a suitable light distribution type in the road light design. 
     However, it is difficult for the user to arbitrarily adjust the brightness and diffusion range of light emitted from various lamps, such as a high-pressure mercury lamp, a fluorescent lamp, and a sodium lamp, used as a light source in the streetlamp according to the related art, since the brightness and the diffusion range are fixed during the manufacture of the lamps, and the lamps have a very short life span and a large amount of power consumption. 
     In order to solve these problems, in recent years, a lighting apparatus using light emitting diodes (LEDs) as a light source has been proposed. In addition, with the development of technique, light emitting diodes with a small amount of power consumption and high brightness have been developed and come into widespread use. 
     As shown in  FIG. 2 , in the lighting apparatus using the light emitting diodes, generally, a plurality of light emitting diode modules  10   a  are mounted to the lower surface of an upper plate  11  of the lamp housing member  10 , and a reflecting plate  10   b  is provided on the inner surface of a side portion  12  of the lamp housing member  10 . The light emitting diode modules  10   a  and the reflecting plate  10   b  are used to illustrate the road. 
     In the lighting apparatus using the light emitting diodes, the plurality of light emitting diode modules  10   a  are mounted to the lower surface of an upper plate  11  in order to ensure a cut-off-angle at which pedestrians or drivers cannot directly view the light emitting diode modules within a predetermined angle range. 
     In a lighting apparatus including the light emitting diodes as well as the lighting apparatus using the light emitting diodes, when light from light source is directly emitted to the pedestrians or drivers, light is likely to hinder the walking of the pedestrians or the driving of the drivers, which may cause traffic accidents. Therefore, it is essential to ensure the cut-off-angle. 
     The light emitting diode has a substantially permanent life span, as compared to the lamps according to the related art, and the brightness of light emitted from the light emitting diodes is determined by a combination of the light emitting diodes. However, when light distribution is formed by the reflecting plate, a light distribution area is small, and brightness is low. In addition, there are limitations in forming sufficient light distribution to effectively illuminate the road surface, that is, in forming the first to fifth light distribution types. 
     Further, since it is difficult to effectively dissipate heat generated from a plurality of light emitting diodes, emission efficiency is lowered due to heat, which results in the damage of parts. 
     Therefore, the lighting apparatus using the light emitting diodes depends on only the reflecting plate to provide desired brightness except for the ideal arrangement of the light emitting diodes during manufacture. As a result, the lighting apparatus using the light emitting diodes is ineffective to illuminate the road, and is not used in the wide range. 
     Further, a lighting apparatus using light emitting diodes shown in  FIG. 3  has been proposed in which a plurality of light emitting diode modules la are mounted to a V-shaped lamp mounting frame  1  at predetermined intervals. 
     The lighting apparatus using the light emitting diodes can adjust light distribution and a light distribution area by adjusting the angle of the lamp mounting frame  1 . However, there are limitations in the adjustment of the angle, and since the light emitting diode modules  1   a  are exposed to the outside, light emitted from the light emitting diode modules is directly emitted to the eye of the pedestrian or the driver, which may interfere with safe walking or driving due to glare. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     An object of the invention is to provide a lighting apparatus using light emitting diodes that has a large light distribution area and high brightness and is capable of forming various light distributions to effectively illuminate the road. 
     Another object of the invention is to provide a lighting apparatus using light emitting diodes that is capable of easily ensuring a cut-off-angle at which pedestrians or drivers cannot directly view light emitting diode modules within a predetermined angle range. 
     Still another object of the invention is to provide a lighting apparatus using light emitting diodes that is capable of easily obtaining a desired light distribution by adjusting the mounting angles of light emitting diode modules, and improving flexibility in the lighting design. 
     Technical Solution 
     In order to achieve the objects, according to an aspect of the invention, there is provided a lighting apparatus using light emitting diodes. The lighting apparatus includes: a lamp housing member that has a circular upper plate and an inclined side portion formed at an outer circumference of the upper plate; first light emitting diode modules that are provided on a lower surface of the upper plate; and second light emitting diode modules that are provided on an inner surface of the side portion. 
     Advantageous Effects 
     According to the invention, the first light emitting diode modules mounted to the lower surface of the upper plate and the second light emitting diode modules mounted to the inner surface of an inclined side portion are used to illuminate the road. Therefore, it is possible to illuminate the road with a large light distribution area and high brightness. 
     Further, according to the invention, it is possible to freely form the first to fifth light distribution types that are mainly used to illuminate the road by adjusting the mounting angles and the number of second light emitting diode modules mounted to the inner surface of the side portion. Therefore, it is possible to improve flexibility in the road lighting design. 
     Furthermore, according to the invention, it is possible to easily ensure a cut-off-angle at which pedestrians or drivers cannot directly view the second light emitting diode modules within a predetermined angle range by adjusting the inclination angle of the side portion. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram schematically illustrating general light distribution types; 
         FIGS. 2 and 3  are diagrams schematically illustrating a lighting apparatus using light emitting diodes according to the related art; 
         FIGS. 4 and 5  are perspective views illustrating an embodiment of the invention; 
         FIG. 6  is a perspective view illustrating another embodiment of the invention; 
         FIGS. 7 to 9  are perspective views illustrating still another embodiment of the invention; 
         FIG. 10  is a longitudinal cross-sectional view illustrating an example of the invention; 
         FIG. 11  is a perspective view illustrating light emitting diode modules according to the invention; 
         FIGS. 12 and 13  are bottom views illustrating an embodiment of the invention; 
         FIGS. 14 and 15  are bottom views illustrating another embodiment of the invention; 
         FIGS. 16 to 18  are enlarged views illustrating examples of the mounting of second light emitting diode modules according to the invention; 
         FIG. 19  is a diagram illustrating angle adjusting blocks according to the invention; 
         FIGS. 20 to 23  are cross-sectional views illustrating examples of the usage of the angle adjusting blocks shown in  FIG. 19 ; 
         FIGS. 24 to 26  are diagrams schematically illustrating examples of a cut-off-angle according to the invention; 
         FIG. 27  is an exploded perspective view illustrating an embodiment of the invention; 
         FIGS. 28 and 29  are enlarged perspective views illustrating an embodiment of the invention; 
         FIG. 30  is a perspective view illustrating an example of a lamp housing member according to the invention; 
         FIG. 31  is a side view illustrating another example of the lamp housing member according to the invention; 
         FIGS. 32 to 34  are diagrams schematically illustrating examples of inclined block members according to the invention; 
         FIGS. 35 to 48  are diagrams illustrating other embodiments of the invention 
     
    
    
     DESCRIPTION OF REFERENCE NUMERALS IN THE DRAWINGS 
     
         
         
           
               10 : lamp housing member 
               11 : upper plate 
               12 : side portion 
               13 : transparent panel member 
               14 : fixing plate 
               15 : bolt 
               16 : packing ring 
               17 : heat sink 
               18 : angle adjusting block 
               20 : first light emitting diode module 
               30 : second light emitting diode module 
               40 : inclined block member 
           
         
       
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings. 
       FIGS. 4 and 5  are perspective views illustrating an embodiment of the invention, and show an example of a lamp housing member having an upper plate that is parallel to a road surface and a side portion composed of one inclined plane. 
       FIG. 6  is a perspective view illustrating another embodiment of the invention, and shows an example of a lamp housing member having an upper plate that is inclined at a predetermined angle with respect to the horizontal plane parallel to a road surface. 
       FIGS. 7 to 9  are perspective views illustrating still another embodiment of the invention, and show an example of a lamp housing member having a side portion that includes a plurality of inclined planes inclined at different angles. 
       FIG. 10  is a longitudinal cross-sectional view illustrating an embodiment of the invention, and shows a first light emitting diode module and a second light emitting diode module that are mounted to the lower surface of the upper plate and the inner surface of the side portion, respectively. 
       FIG. 11  is a perspective view schematically illustrating the light emitting diode modules according to the invention, and shows an example of the structure of a plurality of light emitting diode modules that are mounted to a metal printed circuit board and supplied with power to emit light. 
       FIGS. 12 and 13  are bottom views illustrating an embodiment of the invention, and  FIGS. 14 and 15  are bottom views illustrating another embodiment of the invention.  FIGS. 12 and 14  show a plurality of second light emitting diode modules that are mounted on the entire inner surface of the side portion at predetermined intervals, and  FIGS. 13 and 15  show a plurality of second light emitting diode modules that are mounted on a portion of the side portion at predetermined intervals. 
       FIGS. 16 to 18  are enlarged views illustrating examples of the mounting of the second light emitting diode modules, and show examples of mounting a plurality of light emitting diode modules on the inner surfaces of the side portions having different inclination angles. 
       FIG. 19  is a diagram illustrating angle adjusting blocks according to the invention, and shows various shapes of the angle adjusting block that can adjust the mounting angle of the second light emitting diode module by an angle of 10°. 
       FIGS. 20 to 23  are cross-sectional views illustrating the usage of the angle adjusting block shown in  FIG. 19 .  FIGS. 20 and 21  show an example of adjusting the angle of the second light emitting diode module by 10° in the horizontal direction, and  FIGS. 22 and 23  show an example of adjusting the angle of the second light emitting diode module by 10° from the original angle in the vertical direction. 
       FIGS. 24 to 26  are diagrams schematically illustrating examples of a cut-off-angle according to the invention, and show examples of ensuring the cut-off-angle at which pedestrians or drivers cannot directly view the emitting diode modules mounted to the side portion including inclined planes, which are inclined at different angles, within a predetermined angle. 
       FIG. 27  is an exploded perspective view illustrating an embodiment of the invention, and shows an example of mounting a transparent panel member to a lower part of the lamp housing member. 
       FIGS. 28 and 29  are enlarged cross-sectional views illustrating an embodiment of the invention. Specifically,  FIGS. 28 and 29  are partially enlarged cross-sectional views illustrating the transparent panel member mounted to a power part of the side portion of the lamp housing member, and show the shapes of the inner surfaces of the side portions. 
       FIG. 30  is a perspective view illustrating an example of the lamp housing member according to the invention, and shows the lamp housing member having a heat sink for dissipating heat at its upper part. 
       FIG. 31  is a side view illustrating another example of the lamp housing member according to the invention, and shows an example of the shape of a heat sink of a lamp housing member having an inclined upper plate. 
       FIGS. 32 to 34  are diagrams schematically illustrating examples of an inclined block member according to the invention, and show examples of a three-stage block, a two-stage block, and a single-stage block, respectively. 
       FIGS. 35 to 48  are diagrams illustrating other embodiments of the invention, and show a second light distribution type, a third light distribution type, and a fourth light distribution type. 
     As shown in  FIG. 4 , a lamp housing member  10  according to the invention is mounted to an arm member  110  that extends from the top of a lamp post  100 , which is erected in the vertical direction with respect to the road surface, to one side. 
     The lamp housing member  10  basically includes an upper plate  11  that has a circular shape and is parallel to the road surface and a side portion  12  that is formed along the outer circumference of the upper plate  11  and is inclined at an acute angle with respect to the upper plate  11 . 
     As shown in  FIG. 5 , the side portion  12  is basically inclined at an angle of 60 with respect to a horizontal plane that is parallel to the road surface. However, the side portion may be inclined at various angles according to light distribution in the road lighting design. 
     Further, as shown in  FIG. 6 , a lamp housing member  10  according to the invention basically includes an upper plate  11  that has a circular shape and is inclined downward from one end to the other end of a horizontal line that is parallel to the road surface, and a side portion  12  that is formed along the outer circumference of the upper plate  11  and is inclined at an acute angle with respect to the upper plate  11 . 
     The upper plate  11  is formed such that it is inclined downward using a point where the upper plate  11  is connected to the arm member  110  as the center of the upper plate  11 . In this case, the side portion  12  has a lower end that is parallel to the ground, and is formed such that the area of the surface to which second light emitting diode modules  30  are mounted is gradually decreased from a portion of the inner surface facing the road to a portion of the inner surface facing the lamp post  100 . 
     Therefore, the number of second light emitting diode modules  30  mounted to the inner surface of the side portion  12  is gradually decreased from a portion of the inner surface facing the road to a portion of the inner surface facing the lamp post  100 . 
     According to this structure, it is possible to mount a sufficient number of second light emitting diode modules  30  to illuminate the road, and reduce the number of second light emitting diode modules  30  that do not illuminate the road. As a result, it is possible to sufficiently illuminate the road and form sufficient light distribution with a small number of second light emitting diode modules  30 , and thus reduce manufacturing costs. 
     Furthermore, since the upper plate  11  is inclined, it is easy to mount a heat sink  17 , which will be described below, to an upper part of the upper plate. In addition, it is easy to design and manufacture the lamp housing member  10  to perform concentrated illumination in one direction. As a result, it is possible to reduce manufacturing costs. 
     Moreover, as shown in  FIGS. 7 to 9 , a lamp housing member  10  according to the invention includes a circular upper plate  11  and a side portion  12  that is formed along the outer circumference of the upper plate  11  and is inclined at an acute angle with respect to the upper plate  11 . The side portion  12  includes a plurality of inclined planes that are inclined at different angles. 
     The side portion  12  includes a plurality of inclined planes that extend from the bottom of the upper plate  11 . In the invention, the inclined planes sequentially extend from the bottom of the upper plate  11  and have different inclination angles. The inclines planes basically include first to third inclined planes  12   a ,  12   b , and  12   c . The third incline plane  12   c  is inclined at the largest angle with respect to a horizontal plane parallel to the road surface, followed by the second and first planes  12   b  and  12   a.    
     The first inclined plane  12   a  is inclined 50° with respect to the horizontal plane parallel to the road surface, the second inclined plane  12   b  is inclined 60° with respect to the horizontal plane parallel to the road surface, and the third inclined plane  12   c  is inclined 70° with respect to the horizontal plane parallel to the road surface. However, the inclination angles of the inclined planes may vary according to light distribution in the road lighting design. 
     Meanwhile, as shown in  FIG. 10 , the first and second light emitting diode modules  20  and  30  are mounted to the lower surface of the upper plate  11  and the inner surface of the side portion  12 , respectively. 
     As shown in  FIG. 11 , the first and second light emitting diode modules  20  and  30  each include a light emitting diode (LED) chip (not shown) that is mounted on a metal printed circuit board (PCB)  20   a  and is supplied with power to emit light, and a lens unit and/or reflector (not shown) that focuses light emitted from the light emitting diode chip. 
     The lens unit of each of the first and second light emitting diode modules  20  and  30  focuses light emitted from the light emitting diode chip to adjust a light emission range. For example, as the lens unit, a 12°lens, a 25° lens, a 30° lens, or a 45° lens is used according to the light emission range. 
     This has been known in the art, and thus a detailed description thereof will be omitted. This is similarly applied to the first and second light emitting diode modules  20  and  30 . 
     Only one first light emitting diode module  20  may be mounted to the lower surface of the upper plate  11 , or a plurality of first light emitting diode modules  20  may be mounted to the lower surface of the upper plate  11  at predetermined intervals. 
     The mounting position and the number of first light emitting diode modules  20  may depend on light distribution, brightness, and a light distribution area in the lighting design. 
     As shown in  FIGS. 12 and 14 , a plurality of second light emitting diode modules  30  are provided along the circumference of the inner surface of the side portion  12  at predetermined intervals. 
       FIG. 12  shows an example in which a plurality of rows of second light emitting diode modules  30  are mounted to the entire inner surface of the side portion  12  having one inclined plane at predetermined intervals. 
       FIG. 14  shows an example in which a plurality of mounting portions to which a plurality of second light emitting diode modules  30  are mounted are provided at predetermined intervals on the entire inner surface of the side portion  12  including the first to third inclined planes  12   a ,  12   b , and  12   c , which sequentially extend from the bottom of the upper plate  11  and have different inclination angles, such that the mounting portions are symmetric with respect to the center of the upper plate  11 . 
     The mounting portions uniformly divide the inner surface of the side portion  12  on the basis of the center of the upper plate  11 , and include a pair of base mounting portions  50  that are positioned on a reference line passing through the center of the lamp housing member  10  at a point where the lamp housing member  10  is mounted to an arm member  110  of the lamp post  100 , and a plurality of side mounting portions  60  that are symmetrically formed with respect to the center of the reference line linking the pair of base mounting portions  50  at predetermined intervals so as to face each other. 
     In  FIG. 14 , the first to third inclined planes  12   a ,  12   b , and  12   c  are respectively inclined 50°, 60°, and 65° with respect to the horizontal plane that is parallel to the road. The base mounting portions  50  and the side mounting portions  60  divide the inner surface into 18 parts. The side mounting portions  60  include pairs of first to eighth side mounting portions  61 ,  62 ,  63 ,  64 ,  65 ,  66 ,  67 , and  68  that are symmetric with respect to the center of the upper plate  11  between a pair of base mounting portions  50 . 
     The base mounting portions  50  each has two second light emitting diode modules  30  mounted thereto, and the first to eighth side mounting portions  61 ,  62 ,  63 ,  64 ,  65 ,  66 ,  67 , and  68  are provided at predetermined intervals such that they are rotated 20°, 40°, 50°, 70°, 110°, 130°, 140°, and 160° with respect to the base mounting portion  50 , respectively. The first, second, third, fifth, sixth, and seventh side mounting portions  61 ,  62 ,  63 ,  65 ,  66 , and  67  each have five second light emitting diode modules  30 , and the fourth and eighth side mounting portions  64  and  68  each have four second light emitting diode modules  30 . 
     In this case, two first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and the lamp housing member  10  has a diameter of 620 mm. The first and second light emitting diode modules  20  and  30  include light emitting diodes of 2.5 W (3.5×700 mA) and 150 lm, and form a third light distribution type in  FIG. 1 . 
     As shown in  FIGS. 13 and 15 , the second light emitting diode modules  30  are mounted to a portion of the inner surface of the side portion  12  at predetermined intervals. 
       FIG. 13  shows an example in which a plurality of rows of second light emitting diode modules  30  are mounted to a portion of the inner surface of the side portion  12  having one inclined plane. 
       FIG. 15  shows an example in which a plurality of mounting portions  60  to which a plurality of second light emitting diode modules  30  are mounted are provided at pre-determined intervals on the entire inner surface of the side portion  12  including the first to third inclined planes  12   a ,  12   b , and  12   c , which sequentially extend from the bottom of the upper plate  11  and have different inclination angles, such that  18  mounting portions are symmetric with respect to the center of the upper plate  11 . 
     In  FIG. 15 , basically, ten second light emitting diode modules  30  are mounted to each of a continuous series of 7 side mounting portions  60  among the 18 side mounting portions  60 , and 5 second light emitting diode modules  30  are mounted to each of two side mounting portions  60  positioned at both sides of a continuous series of 7 side mounting portions  60 . 
     In this case, two first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and the lamp housing member  10  has a diameter of 620 mm. The first and second light emitting diode modules  20  and  30  include light emitting diodes of 2.5 W (3.5×700 mA) and 150 lm, and form a fifth light distribution type in  FIG. 1 . 
     In  FIGS. 13 and 15 , a portion of the inner surface of the side portion  12  to which the second light emitting diode modules  30  are mounted means a portion of the inner surface facing the road at the point where the lamp housing member  10  is mounted to the arm member  110  of the lamp post  100 . A minimum number of second light emitting diode modules  30  for illuminating the road are provided on the inner surface of the side portion  12  facing the road. In this way, it is possible to improve flexibility in the road lighting design, reduce manufacturing costs, and minimize power consumption. 
     This structure is used when the lamp post  100  is installed adjacent to a wall or a building illuminate and it is unnecessary to illuminate a space in the inward direction of the lamp posit, that is, a space in the opposite direction of the arm member  110 . However, this structure may vary according to the lighting design of a lamp post. 
     As shown in  FIG. 16 , the first to third inclined planes  12   a ,  12   b , and  12   c  of the side portion  12  may be inclined 50°, 60°, and 65° with respect to the horizontal plane parallel to the road surface, respectively. 
     In the example in which ten second light emitting diode modules  30  are mounted, two second light emitting diode modules  30  each having a 30° diode lens and three second light emitting diode modules  30  each having a 45° diode lens are mounted to the first inclined plane  12   a . Two second light emitting diode modules  30  each having a 30° diode lens and one second light emitting diode module  30  having a 25° diode lens are mounted to the second inclined plane  12   b . Two second light emitting diode modules  30  each having a 25° diode lens are mounted to the third inclined plane  12   c.    
       FIG. 17  shows an example in which ten second light emitting diode modules  30  are mounted to the side portion  12  having one inclined plane.  FIG. 18  shows an example in which ten second light emitting diode modules  30  are mounted to the side portion  12  having the first inclined plane  12   a  that is inclined 50° and the second inclined plane  12   b  that is inclined 60°. The shape of the side portion  12  is changed to adjust a light distribution area and a cut-off-angle while maintaining light distribution. 
     As described above, it is possible to form various light distributions by adjusting the inclination angle of the side portion  12 , that is, the mounting angle, the mounting position, and the number of second light emitting diode modules  30 , and to form the most effective light distribution in the road lighting design. As a result, it is possible to improve flexibility in the road lighting design and the lighting efficiency of the road. 
     Further, it is possible to adjust a light distribution area and a cut-off-angle at which the pedestrians or drivers cannot directly view the light emitting diode modules by adjusting the inclination angle and the inclined plane of the side portion  12 , and thus further improve flexibility in the road lighting design. 
     Furthermore, in the lamp housing member  10  according to the invention, angle adjusting blocks  18  capable of adjusting the mounting angle of the second light emitting diode modules  30  may be inserted between the second light emitting diode modules  30  and the inner surface of the side portion  12  to which the second light emitting diode modules  30  are mounted. 
     In the invention, the light distribution and the cut-off-angle may vary according to, for example, the inclination angle of the side portion  12 , the mounting angle of the second light emitting diode module  30 , and the number of second light emitting diode modules  30 . The angle adjusting blocks  18  are mounted to the inner surface of the side portion  12  to adjust the mounting angles of the second light emitting diode modules  30 , which makes it possible to improve flexibility in the road lighting design. 
       FIG. 19  shows various shapes of the angle adjusting block  18  capable of adjusting the mounting angle by 10°. 
     As shown in  FIG. 19 , the angle adjusting block  18  may be formed to have an inclined plane in the vertical direction or in the horizontal direction, or it may be formed to have a pair of inclined planes facing each other. The angle adjusting block  18  may be formed in any shape of inclined plane as long as it can adjust the mounting angle of the second light emitting diode module  30 . 
     As shown in  FIGS. 20 to 23 , the angle adjusting block  18  is mounted between the second light emitting diode module  30  and the mounting surface of the side portion  12  to adjust the mounting angle of the second light emitting diode module  30 .  FIGS. 20 and 21  show an example in which the angle adjusting block  18  is mounted to the mounting surface of the second light emitting diode module  30  to adjust the mounting angle of the second light emitting diode module  30  by 10° in the horizontal direction.  FIGS. 22 and 23  show an example in which the angle adjusting block  18  is mounted to the mounting surface of the second light emitting diode module  30  to adjust the mounting angle of the second light emitting diode module  30  by 10° in the vertical direction. 
     Meanwhile, as shown in  FIGS. 24 to 26 , the invention adjusts the inclination angle and the inclined plane of the side portion  12  to adjust a light distribution area and a cut-off-angle at which the pedestrians or the drivers cannot directly view the light emitting diode module. In this way, it is possible to further improve flexibility in the road lighting design. 
     In the invention,  FIGS. 24 to 26  show an example in which ten second light emitting diode modules  30  are mounted to the side portion  12  including the first to third inclined planes  12   a ,  12   b , and  12   c  that are inclined 50°, 60°, and 65° with respect to the horizontal plane parallel to the road surface, respectively. In the example, two second light emitting diode modules  30  each having a 30° diode lens and three second light emitting diode modules  30  each having a 45° diode lens are mounted to the first inclined plane  12   a , two second light emitting diode modules  30  each having a 30° diode lens and one second light emitting diode module  30  having a 25° diode lens are mounted to the second inclined plane  12   b , and two second light emitting diode modules  30  each having a 25° diode lens are mounted to the third inclined plane  12   c.    
       FIG. 24  shows the cut-off-angle of the second light emitting diode module  30  having the 30° diode lens in the above-mentioned example.  FIG. 25  shows the cut-off-angle of the second light emitting diode module  30  having the 45° diode lens in the above-mentioned example.  FIG. 26  shows the cut-off-angle of the second light emitting diode module  30  having the 25° diode lens in the above-mentioned example. These cut-off-angles are included in the cut-off-angle range for road safety. 
     Although not shown in the drawings, a cut-off-angle ensuring portion that protrudes to a predetermined height from the bottom of the side portion  12  and has no second light emitting diode module  30  mounted thereto is formed at a lower part of the side portion  12 . In this way, it is possible to ensure a large cut-off-angle. 
     The cut-off-angle ensuring portion is formed at a lower part of the inner surface of the side portion  12  that faces the viewing direction of the driver in the traveling direction of vehicles on the road. The cut-off-angle ensuring portion may vary according to the viewing direction of the pedestrian or the driver, a lighting range, and light distribution in the road lighting design. 
     As shown in  FIG. 27 , a transparent panel member  13  for covering an opening portion is mounted to the side portion  12  of the lamp housing member  10  to protect the first and second light emitting diode modules  20  and  30  and to prevent foreign materials from getting into the side portion  12 . 
     The transparent panel member  13  is formed of a transparent or opaque material, such as glass or synthetic resin, and transmits light emitted from the first and second light emitting diode modules  20  and  30 . 
     The transparent panel member  13  has a ring-shaped fixing plate  14  formed at the outer circumference of a lower surface thereof. 
     The transparent panel member  13  is fastened to the lower surface of the side portion  12  by bolts  15 . 
     As shown in  FIGS. 28 and 29 , a packing ring  16  is provided between the lower surface of the side portion  12  and the transparent panel member  13  to seal between the transparent panel member  13  and the side portion  12 . 
     As shown in  FIG. 28 , a step portion for mounting the transparent panel member  13  may be formed at the lower end of the side portion  12 . As shown in  FIG. 29 , an angle ensuring portion  12   a  may be formed which extends downward in the vertical direction from the inner surface of the side portion  12  and has no second light emitting diode module  30  mounted thereto. This shape makes it possible to improve convenience to manufacture a mold. 
     As shown in  FIG. 30 , it is preferable that a heat sink  17  for dissipating heat be provided at the top of the lamp housing member  10  according to the invention. 
     The heat sink  17  includes a plurality of fins or radiation fins that are arranged at the top of the lamp housing member  10  at predetermined intervals, thereby increasing a heat transmission area. In this way, the heat sink dissipates heat generated from the first and second light emitting diode modules  20  and  30  to prevent the breakdown of the first and second light emitting diode modules  20  and  30  due to heat, thereby lengthening the life span of the first and second light emitting diode modules  20  and  30 . 
     Further, it is preferable that a drain outlet  17   a  for draining water be formed in the heat sink  17  in order to easily drain water when it rains or snows. The drain outlet makes it possible to prevent an electric leakage or the breakdown of the first and second light emitting diode modules  20  and  30  due to water. 
     Furthermore, in the lamp housing member  10  including the upper plate  11  that has a circular shape and is inclined downward from one end to the other end of a horizontal line that is parallel to the road surface and the side portion  12  that is formed along the outer circumference of the upper plate  11  and is inclined at an acute angle with respect to the upper plate, preferably, the lower end of the heat sink  17  is inclined in the opposite direction of the direction in which the upper plate  11  is inclined such that the radiation area of the heat sink gradually increases from the other end to one end of the upper plate  11 . 
     In this structure, a large number of second light emitting diode modules  30  are mounted to the side portion  12  positioned at one side of the upper plate  11  of the lamp housing member  10 , and the number of second light emitting diode modules  30  is gradually decreased toward the other side. In addition, in other embodiments, no second light emitting diode module  30  is mounted to the other side. Therefore, it is possible to effectively dissipate heat by increasing the radiation area of the heat sink  17  at one side where a large number of second light emitting diode modules  30  are mounted. 
     Meanwhile, the invention includes inclined block members  40  each of which has one or more inclined planes to which a plurality of second light emitting diode modules  30  are mounted and is mounted to the inner surface of the side portion  12  of the lamp housing member  10 . According to this structure, it is possible to illuminate the road with light distribution for streetlight, that is, first to fifth light distribution types. 
     The inclined block member  40  is interposed between the second light emitting diode modules  30  on the inner surface of the side portion  12 . 
     Next, an embodiment of the invention including the inclined block members  40  will be described. The following embodiment may be similarly applied to the lamp housing member  10  including the side portion  12  having a plurality of inclined planes with different inclination angles. 
     As shown in ( a ) of  FIG. 32 , the inclined block member  40  includes an upper inclined portion  41 , a middle inclined portion  42 , and a lower inclined portion  43  that are inclined at arbitrary angles with respect to a horizontal line that is parallel to the ground. That is, the inclined block member includes a three-stage block  44  of the lower inclined portion  43 , the middle inclined portion  42 , and the upper inclined portion  41 . In this case, the inclination angle of the lower inclined portion  43  is the largest, followed by the middle inclined portion  42  and the upper inclined portion  41 . 
     In the invention, the lower inclined portion  43  is inclined 65° with respect to the horizontal line parallel to the ground, the middle inclined portion  42  is inclined 60° with respect to the horizontal line parallel to the ground, and the upper inclined portion  41  is inclined 50° with respect to the horizontal line parallel to the ground. 
     As shown in ( b ), ( c ), and ( d ) of  FIG. 32 , the three-stage block  44  basically includes first to third three-stage blocks  44   a ,  44   b , and  44   c  to which ten, eight, and five second light emitting diode modules  30  are respectively mounted. In the first three-stage block  44   a , basically, two second light emitting diode modules  30  are mounted to the lower inclined portion  43 , three second light emitting diode modules  30  are mounted to the middle inclined portion  42 , and five second light emitting diode modules  30  are mounted to the upper inclined portion  41 . 
     In the second three-stage block  44   b , basically, two second light emitting diode modules  30  are mounted to the lower inclined portion  43 , three second light emitting diode modules  30  are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30  are mounted to the upper inclined portion  41 . 
     In the third three-stage block  44   c , basically, two second light emitting diode modules  30  are mounted to the lower inclined portion  43 , and three second light emitting diode modules  30  are mounted to the middle inclined portion  42 . 
     As shown in ( a ) of  FIG. 33 , the inclined block member  40  includes an upper inclined portion  41  and a lower inclined portion  43  that are inclined at arbitrary angles with respect to a horizontal line that is parallel to the ground. That is, the inclined block member includes a two-stage block  45  of the lower inclined portion  43  and the upper inclined portion  41 . In this case, the inclination angle of the lower inclined portion  43  is larger than that of the upper inclined portion  41 . 
     In the invention, the lower inclined portion  43  is inclined 60° with respect to the horizontal line parallel to the ground, and the upper inclined portion  41  is inclined 50° with respect to the horizontal line parallel to the ground. 
     As shown in ( b ), ( c ), and ( d ) of  FIG. 33 , the two-stage block  44  basically includes first to third two-stage blocks  45   a ,  45   b , and  45   c  to which ten, eight, and five second light emitting diode modules  30  are respectively mounted. In the first two-stage block  45   a , basically, five second light emitting diode modules  30  are mounted to the lower inclined portion  43 , and five second light emitting diode modules  30  are mounted to the upper inclined portion  41 . 
     In the second two-stage block  45   b , basically, five second light emitting diode modules  30  are mounted to the lower inclined portion  43 , and three second light emitting diode modules  30  are mounted to the upper inclined portion  41 . 
     In the third two-stage block  45   c , basically, five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     As shown in ( a ) of  FIG. 34 , the inclined block member  40  includes a single-stage block  46  having a single inclined portion that is inclined at an arbitrary angle with respect to a horizontal line that is parallel to the ground. 
     In the invention, as an example, the single inclined portion is inclined 60° with respect to the horizontal line parallel to the ground. 
     As shown in ( b ), ( c ), and ( d ) of  FIG. 33 , the single-stage block  46  basically includes first to third single-stage blocks  46   a ,  46   b , and  46   c  to which ten, eight, and five second light emitting diode modules  30  are respectively mounted. 
     According to the following embodiments, it is possible to use the inclined block members  40  to illuminate the road in various light distribution types, that is, the first to fifth light distribution types. 
     Further, in the following embodiments, the side portion  12  of the lamp housing member  10  is divided into 18 parts for mounting the inclined block members  40 . The 18 parts include first and second base mounting portions  70  and  71  opposite to each other, and pairs of first to eighth mounting portions  80 ,  81 ,  82 ,  83 ,  84 ,  85 ,  86 , and  87  that are sequentially provided between the first base mounting portion  70  and the second base mounting portion  71  and are symmetric with respect to the center of a line linking the first and second base mounting portions  70  and  71 . This structure of the lamp housing member  10  is common to the following embodiments. 
     The transparent panel member  13  may be mounted to the bottom of the lamp housing member  10 , and the lamp housing member  10  may be provided with the heat sink  17  for dissipating heat. Since this structure has already been described in detail above, a detailed description thereof will be omitted in the following embodiments. 
     First Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 35 , first to third three-stage blocks  44   a ,  44   b , and  44   c  respectively having 10, 8, and 5 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25 diode lens are mounted to the lower inclined portion  43 , three second light emitting diode modules  30  each having a 12° diode lens are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the second three-stage block  44   b , on the basis of the first three-stage block  44   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43  and three second light emitting diode modules  30  are mounted to the upper inclined portion  41 . In the third three-stage block  44   c , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, eight first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first to third three-stage blocks  44   a ,  44   b , and  44   c  are mounted to the inner surface of the side portion  12 . The third three-stage blocks  44   c  are mounted to the first and second mounting portions  80  and  81 , the first three-stage blocks  44   a  are mounted to the third mounting portions  82 , and the second three-stage blocks  44   b  are mounted to the fourth and fifth mounting portions  83  and  84 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding second three-stage blocks  44   b  are provided between the mounting surfaces of the fourth and fifth mounting portions  83  and  84  and the second three-stage blocks  44   b . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 35 , the second light distribution type is formed. As shown in ( c ) of  FIG. 35 , a maximum candela (cd) is 7660 cd, and the vertical angle of the maximum candela is 60°. 
     That is, this embodiment has a large maximum candela, and the largest vertical angle of the maximum candela, 60°, which is the largest value among other embodiments of the second light distribution type. 
     The large maximum candela and the large vertical angle of the maximum candela mean that the uniformity of the surface illuminated by a lamp is high. This embodiment has the highest uniformity among the other embodiments of the second light distribution type. 
     This embodiment can concentrate most of light on the road, which is an illumination target, and effectively illuminate only the road. 
     Second Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 36 , first to third three-stage blocks  44   a ,  44   b , and  44   c  respectively having 10, 8, and 5 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25° diode lens are mounted to the lower inclined portion  43 , one second light emitting diode module  30  having a 25° diode lens and two second light emitting diode modules  30  each having a 30° diode lens are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the second three-stage block  44   b , on the basis of the first three-stage block  44   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43  and three second light emitting diode modules  30  are mounted to the upper inclined portion  41 . In the third three-stage block  44   c , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, eight first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first to third three-stage blocks  44   a ,  44   b , and  44   c  are mounted to the inner surface of the side portion  12 . The third three-stage blocks  44   c  are mounted to the first and second mounting portions  80  and  81 , the first three-stage blocks  44   a  are mounted to the third mounting portions  82 , and the second three-stage blocks  44   b  are mounted to the fourth and fifth mounting portions  83  and  84 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding second three-stage blocks  44   b  are provided between the mounting surfaces of the fourth and fifth mounting portions  83  and  84  and the second three-stage blocks  44   b . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 36 , the second light distribution type is formed. As shown in ( c ) of  FIG. 36 , a maximum candela (cd) is 7105 cd, and the vertical angle of the maximum candela is 50°. 
     That is, this embodiment has the average maximum candela and the average vertical angle of the maximum candela, 60°, of the other embodiments. Therefore, this embodiment can be used in the widest range. 
     Third Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 37 , first to third two-stage blocks  45   a ,  45   b , and  45   c  respectively having 10, 8, and 5 second light emitting diode modules  30  mounted thereto are used. In the first two-stage block  45   a , two second light emitting diode modules  30 , each having a 25° diode lens, and three second light emitting diode modules  30 , each having a 45° diode lens, are mounted to the lower inclined portion  43 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the second two-stage block  45   b , on the basis of the first two-stage block  45   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43  and three second light emitting diode modules  30  are mounted to the upper inclined portion  41 . In the third two-stage block  45   c , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, eight first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first to third two-stage blocks  45   a ,  45   b , and  45   c  are mounted to the inner surface of the side portion  12 . The third two-stage blocks  45   c  are mounted to the first and second mounting portions  80  and  81 , the first two-stage blocks  45   a  are mounted to the third mounting portions  82 , and the second two-stage blocks  45   b  are mounted to the fourth and fifth mounting portions  83  and  84 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding second two-stage blocks  45   b  are provided between the mounting surfaces of the fourth and fifth mounting portions  83  and  84  and the second two-stage blocks  45   b . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 37 , the second light distribution type is formed. As shown in ( c ) of  FIG. 37 , a maximum candela (cd) is 7716 cd, and the vertical angle of the maximum candela is 50°. 
     That is, this embodiment has the largest maximum candela and thus high uniformity. 
     Therefore, this embodiment can concentrate most of light on the road, which is an illumination target, and effectively illuminate only the road. 
     Fourth Embodiment 
     In this embodiment, as shown in (a) of  FIG. 38 , first to third single-stage blocks  46   a ,  46   b , and  46   c  respectively having 10, 8, and 5 second light emitting diode modules  30  mounted thereto are used. In the first single-stage block  46   a , two second light emitting diode modules  30 , each having a 25° diode lens, are mounted to a lower portion, three second light emitting diode modules  30 , each having a 30° diode lens, and three second light emitting diode modules  30 , each having a 45° diode lens, are mounted to a middle portion, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to an upper portion. The second single-stage block  46   b  has eight second light emitting diode modules  30  mounted thereto, and the third single-stage block  46   c  has five second light emitting diode modules  30  mounted thereto, on the basis of the first single-stage block  46   a.    
     Further, in this embodiment, eight first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first to third single-stage blocks  46   a ,  46   b , and  46   c  are mounted to the inner surface of the side portion  12 . The third single-stage blocks  46   c  are mounted to the first and second mounting portions  80  and  81 , the first single-stage blocks  46   a  are mounted to the third mounting portions  82 , and the second single-stage blocks  46   b  are mounted to the fourth and fifth mounting portions  83  and  84 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding second single-stage blocks  46   b  are provided between the mounting surfaces of the fourth and fifth mounting portions  83  and  84  and the second single-stage blocks  46   b . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     As shown in ( b ) of  FIG. 38 , this embodiment forms the second light distribution type. As shown in ( c ) of  FIG. 38 , a maximum candela (cd) is 7092 cd, and the vertical angle of the maximum candela is 50°. 
     That is, this embodiment has high productivity and assembility since it uses the single-stage blocks  46 . In addition, since this embodiment has high thermal conductivity during operation, it is possible to stabilize the overall manufacturing process. 
     Further, this embodiment is advantageous to emit light immediately below the lamp housing member  10  that emits light below the lamp post  100 . 
     Fifth Embodiment 
     In this embodiment, as shown in (a) of  FIG. 39 , first and third three-stage blocks  44   a  and  44   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25° diode lens are mounted to the lower inclined portion  43 , one second light emitting diode module  30  having a 25° diode lens and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the third three-stage block  44   c , on the basis of the first three-stage block  44   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, five first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first and third three-stage blocks  44   a  and  44   c  are mounted to the inner surface of the side portion  12 . The third three-stage block  44   c  is mounted to the first base mounting portion  70 , the first three-stage blocks  44   a  are mounted to the first to third mounting portions  80  to  82 , and the third three-stage blocks  44   b  are mounted to the fourth mounting portions  83 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding first three-stage blocks  44   a  are provided between the mounting surfaces of the second and third mounting portions  81  and  82  and the first three-stage blocks  44   a . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 39 , the third light distribution type is formed. As shown in ( c ) of  FIG. 39 , a maximum candela (cd) is 7793 cd, and the vertical angle of the maximum candela is 50°. 
     In this embodiment, light is not emitted to the rear side of the lamp housing member  10  where the second light emitting diode modules  30  are provided. Therefore, this embodiment is effective to illuminate only the road which a plurality of second light emitting diode modules  30  face. 
     Sixth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 40 , first and third two-stage blocks  45   a  and  45   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first two-stage block  45   a , two second light emitting diode modules  30 , each having a 25° diode lens, and three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the lower inclined portion  43 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the third two-stage block  45   c , on the basis of the first two-stage block  45   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, five first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first and third two-stage blocks  45   a  and  45   c  are mounted to the inner surface of the side portion  12 . The third two-stage block  45   c  is mounted to the first base mounting portion  70 , the first two-stage blocks  45   a  are mounted to the first to third mounting portions  80  to  82 , and the third two-stage block  45   c  is mounted to the fourth mounting portion  83 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding first two-stage blocks  45   a  are provided between the mounting surfaces of the second and third mounting portions  81  and  82  and the first two-stage blocks  45   a . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 40 , the third light distribution type is formed. As shown in ( c ) of  FIG. 40 , a maximum candela (cd) is 8452 cd, and the vertical angle of the maximum candela is 50°. 
     That is, since the maximum candela is the largest, this embodiment has high uniformity. In addition, light is not emitted to the rear side of the lamp housing member  10  where the second light emitting diode modules  30  are provided. Therefore, this embodiment is effective to illuminate only the road which a plurality of second light emitting diode modules  30  face. 
     Seventh Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 41 , first and third single-stage blocks  46   a  and  46   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first single-stage block  46   a , two second light emitting diode modules  30 , each having a 25° diode lens, are mounted to a lower portion, three second light emitting diode modules  30 , each having a 30° diode lens, and three second light emitting diode modules  30 , each having a 45° diode lens, are mounted to a middle portion, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to an upper portion. The third single-stage block  46   c  has five second light emitting diode modules  30  mounted thereto, on the basis of the first single-stage block  46   a.    
     Further, in this embodiment, five first light emitting diode modules  20  are mounted to the lower surface of the upper plate  11 , and combinations of the first and third single-stage blocks  46   a  and  46   c  are mounted to the inner surface of the side portion  12 . The third single-stage block  46   c  is mounted to the first base mounting portion  70 , the first single-stage blocks  46   a  are mounted to the first to third mounting portions  80  to  82 , and the third single-stage block  46   b  is mounted to the fourth mounting portion  83 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding first single-stage blocks  46   a  are provided between the mounting surfaces of the second and third mounting portions  81  and  82  and the first single-stage blocks  46   a . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     As shown in ( b ) of  FIG. 41 , this embodiment forms the third light distribution type. As shown in ( c ) of  FIG. 41 , a maximum candela (cd) is 8172 cd, and the vertical angle of the maximum candela is 60°. 
     This embodiment has a large maximum candela and the largest vertical angle of the maximum candela, 60°, which is the largest value among the other embodiments of the third light distribution type. 
     The large maximum candela and the large vertical angle of the maximum candela mean that the uniformity of the surface illuminated by a lamp is high. This embodiment has the highest uniformity among the other embodiments of the third light distribution type. 
     This embodiment can concentrate most of light on the road, which is an illumination target, and effectively illuminate only the road. 
     Further, this embodiment has high productivity and assembility since it uses the single-stage blocks  46 . In addition, since this embodiment has high thermal conductivity during operation, it is possible to stabilize the overall manufacturing process. 
     Furthermore, in this embodiment, light is not emitted to the rear side of the lamp housing member  10  where the second light emitting diode modules  30  are provided. Therefore, this embodiment is effective to illuminate only the road to which a plurality of second light emitting diode modules  30  face. 
     Eighth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 42 , first and third three-stage blocks  44   a  and  44   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25° diode lens are mounted to the lower inclined portion  43 , one second light emitting diode module  30  having a 25° diode lens and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the third three-stage block  44   c , on the basis of the first three-stage block  44   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, first to third upper light emitting diode units  20   a ,  20   b , and  20   c  each having five first light emitting diode modules  20  are provided on the lower surface of the upper plate  11 . 
     The first upper light emitting diode unit  20   a  is provided at the center of the lower surface of the upper plate  11 , and the second and third upper light emitting diode units  20   b  are  20   c  are provided on the lower surface at both sides of a line linking the first and second base mounting portions  70  and  71 , with 20° angle adjusting blocks  18  interposed between the mounting surfaces, such that they are inclined 20° toward the road to be illustrated. 
     Furthermore, in this embodiment, combinations of the first and third three-stage blocks  44   a  and  44   c  are mounted to the inner surface of the side portion  12 . The third three-stage blocks  44   c  are mounted to the first base mounting portion  70  and the first mounting portion  80 , the first three-stage blocks  44   a  are mounted to the second and third mounting portions  81  and  82 , and the third three-stage blocks  44   c  are mounted to the fourth mounting portions  83 . 
     Furthermore, 10° angle adjusting blocks  18  for adjusting both ends of each of the corresponding third and first three-stage blocks  44   c  and  44   a  are provided between the mounting surfaces of the first and second mounting portions  80  and  81  and the third and first three-stage blocks  44   c  and  44   a . In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. In addition, 20° angle adjusting blocks  18  for adjusting both ends of each of the corresponding third three-stage blocks  44   c  are provided between the mounting surfaces of the third mounting portions  82  and the third three-stage blocks  44   c . In the 20° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 20° angle adjusting block is inclined 20° toward the outside. 
     As shown in ( b ) of  FIG. 42 , this embodiment forms the fourth light distribution type. As shown in ( c ) of  FIG. 42 , a maximum candela (cd) is 8440 cd, and the vertical angle of the maximum candela is 60°. 
     This embodiment of the fourth light distribution type has a large maximum candela and a large vertical angle, 60°, of the maximum candela. Therefore, this embodiment has high uniformity. 
     In this embodiment, the maximum candela is obtained in the vicinity of the lamp housing member  10 , and the quantity of light is concentrated below the lamp post  100 . Therefore, this embodiment is effective to focus light on a small area with high brightness. 
     Ninth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 43 , first and third three-stage blocks  44   a  and  44   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25° diode lens are mounted to the lower inclined portion  43 , one second light emitting diode module  30  having a 25° diode lens and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the third three-stage block  44   c , on the basis of the first three-stage block  44   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, five first light emitting diode modules  20  are mounted at the center of the lower surface of the upper plate  11 , and combinations of the first and third three-stage blocks  44   a  and  44   c  are mounted to the inner surface of the side portion  12 . The first three-stage blocks  44   a  are mounted to the first base mounting portion  70  and the first to third mounting portions  80  to  82 , and the third three-stage blocks  44   c  are mounted to the fourth mounting portions  83 . 
     Furthermore, 20° angle adjusting blocks  18  for adjusting both ends of each of the corresponding first three-stage blocks  44   a  are provided between the mounting surfaces of the first to third mounting portions  80  to  82  and the first three-stage blocks  44   a . In the 20° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 20° angle adjusting block is inclined 20° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 43 , the fourth light distribution type is formed. As shown in ( c ) of  FIG. 43 , a maximum candela (cd) is 14176 cd, and the vertical angle of the maximum candela is 50°. 
     This embodiment has the largest maximum candela among the other embodiments of the fourth light distribution type and thus has high uniformity. The maximum candela is obtained at a distance from the lamp housing member  10 . Therefore, this embodiment is effective to illuminate a large area and can obtain uniform light distribution. 
     Tenth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 44 , first and third two-stage blocks  45   a  and  45   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first two-stage block  45   a , two second light emitting diode modules  30 , each having a 25° diode lens, and three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the lower inclined portion  43 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the third two-stage block  45   c , on the basis of the first two-stage block  45   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, two first light emitting diode modules  20  are mounted at the center of the lower surface of the upper plate  11 , and combinations of the first and third two-stage blocks  45   a  and  45   c  are mounted to the inner surface of the side portion  12 . The first two-stage blocks  45   a  are mounted to the first base mounting portion  70  and the first to third mounting portions  80  to  82 , and the third two-stage blocks  45   c  are mounted to the fourth mounting portions  83 . 
     Further, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the first, second, and fourth mounting portions  80 ,  81 , and  83  and the first and third two-stage blocks  45   a  and  45   c  corresponding thereto, thereby adjusting both ends of each of the first and third two-stage blocks. In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. In addition, 20° angle adjusting blocks  18  for adjusting both ends of each of the corresponding first two-stage blocks  45   a  are provided between the mounting surfaces of the third mounting portions  82  and the first two-stage blocks  45   a . In the 20° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 20° angle adjusting block is inclined 20° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 44 , the fourth light distribution type is formed. As shown in ( c ) of  FIG. 44 , a maximum candela (cd) is 12076 cd, and the vertical angle of the maximum candela is 50°. 
     This embodiment has a large maximum candela among the other embodiments of the fourth light distribution type and thus has high uniformity. The maximum candela is obtained at a distance from the lamp housing member  10 . Therefore, this embodiment is effective to illuminate a large area and can obtain uniform light distribution. 
     Eleventh Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 45 , first and fourth three-stage blocks  44   a  and  44   d  respectively having 10 and 3 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25° diode lens are mounted to the lower inclined portion  43 , one second light emitting diode module  30  having a 25° diode lens and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the fourth three-stage block  44   d , three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . 
     Further, in this embodiment, first to fourth upper light emitting diode units  20   a ,  20   b ,  20   c , and  20   d  each having five first light emitting diode modules  20  are provided on the lower surface of the upper plate  11 . 
     The first upper light emitting diode unit  20   a  is provided at the center of the lower surface of the upper plate  11 , the second upper light emitting diode unit  20   b  is provided between the first upper light emitting diode unit  20   a  and the second base mounting portion  71 , and the third and fourth upper light emitting diode units  20   c  are  20   d  are provided on the lower surface at both sides of a line linking the first and second base mounting portions  70  and  71 , with 20° angle adjusting blocks  18  interposed between the mounting surfaces, such that they are inclined 20° toward the road to be illustrated. 
     Furthermore, in this embodiment, combinations of the first and fourth three-stage blocks  44   a  and  44   d  are mounted to the inner surface of the side portion  12 . The first three-stage blocks  44   a  are mounted to the first base mounting portion  70  and the first to third mounting portions  80  to  82 , and the fourth three-stage blocks  44   d  are mounted to the fourth mounting portions  83 . 
     Further, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the first to third mounting portions  80 ,  81 , and  82  and the first three-stage blocks  44   a  corresponding thereto, thereby adjusting both ends of each of the first three-stage blocks. In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In this embodiment, as shown in ( b ) of  FIG. 45 , the fourth light distribution type is formed. As shown in ( c ) of  FIG. 45 , a maximum candela (cd) is 8303 cd, and the vertical angle of the maximum candela is 60°. 
     This embodiment has a large maximum candela and a large vertical angle of the maximum candela among the other embodiments of the fourth light distribution type and thus has high uniformity. The maximum candela is obtained in the vicinity of the lamp housing member  10  and the quantity of light is concentrated below the lamp post  100 . Therefore, this embodiment is effective to focus light on a small area with high brightness. 
     Twelfth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 46 , first and third three-stage blocks  44   a  and  44   c  respectively having 10 and 5 second light emitting diode modules  30  mounted thereto are used. In the first three-stage block  44   a , two second light emitting diode modules  30  each having a 25° diode lens are mounted to the lower inclined portion  43 , one second light emitting diode module  30  having a 25° diode lens and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the middle inclined portion  42 , and three second light emitting diode modules  30 , each having a 45° diode lens, and two second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the upper inclined portion  41 . In the third three-stage block  44   c , on the basis of the first three-stage block  44   a , five second light emitting diode modules  30  are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, five first light emitting diode modules  20  are mounted at the center of the lower surface of the upper plate  11 , and combinations of the first and third three-stage blocks  44   a  and  44   c  are mounted to the inner surface of the side portion  12 . The third three-stage blocks  44   c  are mounted to the first base mounting portion  70  and the fourth mounting portions  83 , and the first three-stage blocks  44   a  are mounted to the first to third mounting portions  80  to  82 . 
     Further, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the first, second, and fourth mounting portions  80 ,  81 , and  83  and the first and third three-stage blocks  44   a  and  44   c  corresponding thereto, thereby adjusting both ends of each of the first and third three-stage blocks. In the 10° angle adjusting block, one of the two ends facing the first base mounting portion  70  is raised such that the 10° angle adjusting block is inclined 10° toward the outside. 
     In addition, 30° angle adjusting blocks  18  are provided between the mounting surfaces of the first mounting portions  80  and the first three-stage blocks  44   a , thereby adjusting the angles of the first three-stage blocks in the vertical direction. The 30° angle adjusting block raises one end of the upper inclined portion  41  such that the first three-stage block is further inclined by 30°. 
     In this embodiment, as shown in ( b ) of  FIG. 46 , the fourth light distribution type is formed. As shown in ( c ) of  FIG. 46 , a maximum candela (cd) is 9236 cd, and the vertical angle of the maximum candela is 60°. 
     That is, this embodiment has the largest maximum candela and thus high uniformity. Therefore, this embodiment can concentrate light below the lamp housing member  10  and thus is effective to illuminate a small area with high brightness. 
     Thirteenth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 47 , third and fourth two-stage blocks  45   c  and  45   d  respectively having 5 and 3 second light emitting diode modules  30  mounted thereto are used. In the third two-stage block  45   c , two second light emitting diode modules  30 , each having a 25° diode lens, and three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the lower inclined portion  43 . In the fourth two-stage block  45   d , three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, two first light emitting diode modules  20  are mounted at the center of the lower surface of the upper plate  11 , and combinations of the third and fourth three-stage blocks  44   c  and  44   d  are mounted to the inner surface of the side portion  12 . The fourth three-stage blocks  44   d  are mounted to the first and second base mounting portions  70  and  71 , and the third three-stage blocks  44   c  are mounted to the first to eighth mounting portions  80  to  87 . 
     Further, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the first and eighth mounting portions  80  and  87  and the third three-stage blocks  44   c  corresponding thereto, thereby adjusting both ends of each of the third three-stage blocks  44   c . In this way, a pair of third three-stage blocks  44   c  mounted on the first mounting portions  80  are inclined 10° so as to face each other, and a pair of third three-stage blocks  44   c  mounted on the eighth mounting portions  87  are inclined 10° so as to face each other. 
     Furthermore, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the fourth and fifth mounting portions  83  and  84  and the third three-stage blocks  44   c  corresponding thereto, thereby adjusting both ends of each of the third three-stage blocks  44   c . In this way, the third three-stage blocks  44   c  mounted on the fourth and fifth mounting portion  83  and  84  are inclined 10° so as to face each other. 
     In this embodiment, as shown in ( b ) of  FIG. 47 , the fifth light distribution type is formed. As shown in ( c ) of  FIG. 47 , a maximum candela (cd) is 6099 cd, and the vertical angle of the maximum candela is 60°. 
     This embodiment of the fifth light distribution type has a large maximum candela and a large vertical angle of the maximum candela, and thus has high uniformity. Therefore, this embodiment is effective to emit light below the lamp housing member  10  at various angles, thereby illuminating a wide area. 
     Fourteenth Embodiment 
     In this embodiment, as shown in ( a ) of  FIG. 48 , third and fourth two-stage blocks  45   c  and  45   d  respectively having 5 and 3 second light emitting diode modules  30  mounted thereto are used. In the third two-stage block  45   c , two second light emitting diode modules  30 , each having a 25° diode lens, and three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the lower inclined portion  43 . In the fourth two-stage block  45   d , three second light emitting diode modules  30 , each having a 30° diode lens, are mounted to the lower inclined portion  43 . 
     Further, in this embodiment, two first light emitting diode modules  20  are mounted at the center of the lower surface of the upper plate  11 , and combinations of the third and fourth three-stage blocks  44   c  and  44   d  are mounted to the inner surface of the side portion  12 . The fourth three-stage blocks  44   d  are mounted to the first and second base mounting portions  70  and  71 , and the third three-stage blocks  44   c  are mounted to the first to eighth mounting portions  80  to  87 . 
     Further, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the first and eighth mounting portions  80  and  87  and the third three-stage blocks  44   c  corresponding thereto, thereby adjusting both ends of each of the third three-stage blocks  44   c . In this way, a pair of third two-stage blocks  45   c  mounted on the first mounting portions  80  are inclined 10° so as to face each other, and a pair of third three-stage blocks  44   c  mounted on the eighth mounting portions  88  are inclined 10° so as to face each other. 
     Furthermore, 10° angle adjusting blocks  18  are provided between the mounting surfaces of the fourth and fifth mounting portions  83  and  84  and the third two-stage blocks  45   c  corresponding thereto, thereby adjusting both ends of each of the third two-stage blocks  45   c . In this way, the third two-stage blocks  45   c  mounted on the fourth and fifth mounting portion  83  and  84  are inclined 10° so as to face each other. 
     In this embodiment, as shown in ( b ) of  FIG. 48 , the fifth light distribution type is formed. As shown in ( c ) of  FIG. 48 , a maximum candela (cd) is 6579 cd, and the vertical angle of the maximum candela is 60°. 
     This embodiment of the fifth light distribution type has a large maximum candela and a large vertical angle of the maximum candela, and thus has high uniformity. Therefore, this embodiment is effective to emit light below the lamp housing member  10  at various angles, thereby illuminating a wide area. 
     As described above, according to the invention, it is possible to easily obtain various light distributions required for the lighting design by arbitrarily adjusting the mounting angles and the number of second light emitting diode modules  30  mounted to the side portion  12  of the lamp housing member  10 . As a result, it is possible to improve flexibility in the road lighting design. 
     Although the exemplary embodiments of the invention have been described above, the invention is not limited thereto, and various modifications and changes of the invention can be made without departing from the scope and spirit of the invention. 
     Further, basically, the invention is used for streetlamps, and can also be used to form various light distributions.