JP2006288039A - Exterior lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exterior lighting system saving on energy by using solar battery and compensating for lack of a power supply with a commercial power source, using a small-sized and inexpensive electric double layer capacitor. <P>SOLUTION: This exterior lighting system is composed of the solar battery 5, the electric double layer capacitor 9, a commercial power supply line 12 for commercial power supply, a brightness sensor 6, and a switch circuit 11. The soar battery generates electric power smaller than the power which the illumination light consumes in one day. The electric double layer capacitor has electricity storage capacity which stores generated electric power of the solar battery, and supplies power which is equal to or smaller than the power the illumination light consumes in one day. This switch circuit supplies output current of the electric double layer capacitor to the illumination light when the brightness sensor detects that a measured value of surrounding brightness is less than a prescribed value and the storage power is the prescribed value or more, supplies the commercial power supply to the illumination light when the storage power is less than the prescribed value, and supplies no power to the illumination light when the measured value of the surrounding brightness detected by the brightness sensor is at the prescribed value or more. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outdoor lighting device that uses a power source utilizing natural energy and another auxiliary power source.

  An outdoor lighting device using a solar cell as a power source is used by being connected to the solar cell device. In this solar cell device, a storage battery or a capacitor is provided between the solar cell and an illuminating lamp (load), and the solar battery charges the storage battery or the capacitor with electric power generated by sunlight in the daytime, and discharges it at night. Is configured to supply power.

  In solar battery devices that use storage batteries, the amount of solar radiation varies depending on the location and season of the solar battery, and there is a large variation in power generation. To enable stable power supply, the solar battery capacity and storage battery capacity are It is set with a sufficient margin based on the amount of solar radiation at the installation location, and the storage battery capacity is generally set to a capacity for 5 to 30 days of load.

Since the solar battery capacity and the storage battery capacity are set to have a sufficient margin in this way, the solar battery device using the storage battery leads to an increase in size and cost, and the life is short, and the lead storage battery is replenished with a charging solution. In recent years, it is possible to reduce the size and maintain the product for a long period of time. Is known and uses a long-life electric double layer capacitor (also referred to as a capacitor) (for example, see Patent Document 1).
Japanese Patent No. 2964859

  The electric storage capacity of the electric double layer capacitor is set in consideration of the amount of solar radiation in a rainy or cloudy day and the daily power consumption of the load in addition to the solar cell capacity. Since the power consumption of the lighting device is relatively large, an electric double layer capacitor having a large capacity is required. By the way, the electric double layer capacitor has a high raw material cost and a high manufacturing cost, and the amount of production is not large. Therefore, the price is determined per storage capacity. Therefore, a solar cell type outdoor lighting device using an electric double layer capacitor is very expensive, and there is a problem that the purchase quantity does not increase even if it is put on the market.

  Thus, the present invention has the advantages of being miniaturizable, requiring no long-term maintenance, and having a long service life, and is capable of stable power supply using an inexpensive electric double layer capacitor with a small storage capacity. Is intended to be provided at low cost. ,

  The above object is achieved by an outdoor lighting device comprising the following components of the present invention. That is, (a) a solar cell, (b) an electric double layer capacitor that stores electric power generated by the solar cell, (c) an auxiliary power supply line other than a power source using natural energy, and (d) an illumination lamp , (E) an illuminance sensor that measures the illuminance around the illuminating lamp, and (f) when the measured value of the illuminance sensor is greater than or equal to a predetermined value, power supply from the electric double layer capacitor to the illuminating lamp and When the supply of auxiliary power from the auxiliary power supply line to the illuminating lamp is cut off, the measured value of the illuminance sensor is less than a predetermined value, and the power accumulated in the electric double layer capacitor is greater than or equal to a predetermined value Power is supplied from the electric double layer capacitor to the illuminating lamp, and the auxiliary power supply from the auxiliary power supply line to the illuminating lamp is cut off, and the measured value of the illuminance sensor is less than a predetermined value, and the electric A switch circuit that cuts off power supply from the electric double layer capacitor to the illuminating lamp and supplies auxiliary power from the auxiliary power supply line to the illuminating lamp when the power accumulated in the multilayer capacitor is less than a predetermined value. (Claim 1).

  In the outdoor lighting device having the above-described configuration, the switch circuit supplies power from the electric double layer capacitor to the illuminating lamp and supplies the auxiliary power source to the illuminating lamp during the bright day when the measured value of the illuminance sensor exceeds a predetermined value. Also shuts off. The electric double layer capacitor is charged with power from the solar cell. In contrast, when the measured value of the illuminance sensor is less than a predetermined value, for example, at night, the switch circuit enables power supply to the illuminating lamp. In this case, when the storage voltage of the electric double layer capacitor is equal to or higher than a predetermined value, the switch circuit supplies the electric power accumulated in the electric double layer capacitor to the illuminating lamp and also supplies the auxiliary power from the auxiliary power supply line to the illuminating lamp. Shut off the supply. On the other hand, when the storage voltage of the electric double layer capacitor is less than a predetermined value, the switch circuit supplies auxiliary power from the auxiliary power supply line to the lighting lamp, and supplies power from the electric double layer capacitor to the lighting lamp. Shut off. That is, the power source from the solar cell is mainly used, and in the case of shortage, the auxiliary power source is used auxiliary. Therefore, an energy saving effect by utilizing natural energy can be obtained and a stable power supply can be realized.

  The above object of the present invention can also be achieved by an outdoor lighting device comprising the following components. That is, (a) an illuminating lamp, (b) a solar cell having a capacity for generating electric power smaller than the electric power consumed by the illuminating lamp per day, and (c) accumulating electric power generated by the solar cell, An electric double layer capacitor having a storage capacity capable of supplying power equal to or less than the power consumed by the illuminator per day, and (d) an auxiliary power supply line other than a natural energy power source, e) an illuminance sensor for measuring the illuminance around the illuminating lamp; and (f) when the measured value of the illuminance sensor is equal to or greater than a predetermined value, power supply from the electric double layer capacitor to the illuminating lamp and the auxiliary power source. When the supply of auxiliary power from the supply line to the illuminating lamp is cut off, the measured value of the illuminance sensor is less than a predetermined value, and the electric power accumulated in the electric double layer capacitor is greater than or equal to the predetermined value, the electric power Double layer The power is supplied from the capacitor to the illuminating lamp and the auxiliary power supply from the auxiliary power supply line to the illuminating lamp is cut off, the measured value of the illuminance sensor is less than a predetermined value, and the electric double layer capacitor is A switch circuit that cuts off the power supply from the electric double layer capacitor to the illuminating lamp when the accumulated power is less than a predetermined value and supplies auxiliary power from the auxiliary power supply line to the illuminating lamp; (Claim 2).

  In the outdoor lighting device having the above-described configuration, the solar cell may be a small one having a capacity for generating electric power smaller than the electric power consumed by the illuminating lamp per day, and the electric double layer capacitor is the electric power generated by the solar cell. And having a storage capacity capable of supplying power equal to or less than the power consumed by the illuminating lamp per day. And the power supply from a solar cell is mainly used, and when it is insufficient, an auxiliary power supply is used auxiliary. Therefore, the energy saving effect by utilizing natural energy is further promoted, and stable power supply is possible.

In the outdoor lighting device described above, the solar cell and the illumination lamp are attached to the upper portion of the support column, and the illuminance sensor, the electric double layer capacitor, the output circuit, and the switch circuit are provided in the hollow portion at the lower portion of the support column, It is desirable that a maintenance door for sealing the hollow portion is provided so as to be openable and closable (claim 3).
With the above-described configuration, the sunshine time for the solar cell is increased, and a larger capacity of electricity can be stored. The illuminating lamp can illuminate a wide area. Electrical circuits such as an illuminance sensor, an electric double layer capacitor, an output circuit, and a switch circuit are protected in the column. If the door is opened, the electric circuit can be maintained.

According to the present invention, in the outdoor lighting device having the above-described configuration, a wind power generator is provided on an upper portion of the support column, and both the electric power generated by the wind power generator and the power generated by the solar cell are charged in the electric double layer capacitor. It is characterized (claim 4).
With the above configuration, when the amount of solar radiation is large and wind power is present, the electric double layer capacitor is sufficiently charged, and when the amount of solar radiation is at least large, the electric double layer capacitor is sufficiently charged. And when the charge amount from a solar cell and a wind power generator is more than predetermined value, the electric power accumulate | stored in the electric double layer capacitor is supplied to an illumination lamp, and the charge amount from a solar cell and a wind power generator is predetermined value. When it is less than that, auxiliary power is supplied. Accordingly, it is possible to always realize stable lighting with the influence of the weather being minimized.

Solar cells, wind power generators, and illuminating lamps are attached to the upper part of the column, and electrical circuits such as an illuminance sensor, an electric double layer capacitor, an output circuit, and a switch circuit are provided in the hollow part at the lower part of the column. It is desirable that a maintenance door for sealing the hollow portion is provided at the lower part so as to be freely opened and closed (Claim 5).
As a result, the sunshine time for the solar cell is increased, and the wind power generator is easily hit by the wind, so that a larger capacity can be stored, and the illuminating lamp illuminates a wide range. The electrical circuit is protected by a support. Furthermore, maintenance is possible when the door is opened.

  According to the first aspect of the present invention, when the measured value of the illuminance sensor is a predetermined value or more, the power supply from the electric double layer capacitor to the illuminating lamp and the auxiliary power supply from the auxiliary power supply line to the illuminating lamp are cut off. When the measured value of the illuminance sensor is less than the predetermined value and the electric power accumulated in the electric double layer capacitor is greater than or equal to the predetermined value, electric power is supplied from the electric double layer capacitor to the illuminating lamp and from the auxiliary power supply line When the auxiliary power supply to the illuminating lamp is cut off, the measured value of the illuminance sensor is less than the predetermined value, and the electric power stored in the electric double layer capacitor is less than the predetermined value, the electric double layer capacitor to the illuminating lamp As the power supply is cut off and the auxiliary power is supplied from the auxiliary power supply line to the illuminating lamp, the influence of the weather is minimized, the natural energy is maximized, and the outdoor is low-cost. It is possible to carry out a light.

  According to the invention of claim 2, a solar cell having a capacity for generating electric power smaller than the electric power consumed by the illuminating lamp per day is used, and the electric double layer capacitor stores the electric power generated by the solar cell. Since a lamp having a storage capacity capable of supplying less power than the power consumed by a daylight is used, a small and inexpensive solar cell and electric double layer capacitor can be used. Energy-saving outdoor lighting devices can be provided at a significantly lower price.

  According to the invention of claim 3, the solar cell can ensure a long sunshine time and can store a larger capacity, the illuminating lamp can illuminate a wide range, and the electric circuit is in the column. It is protected and maintenance of the electric circuit can be easily performed.

  According to the invention of claim 4, the solar battery and the wind power generator are provided, and when the charge amount from the solar battery and the wind power generator is larger than a predetermined value, the electric power accumulated in the electric double layer capacitor is supplied to the illuminating lamp. Since the auxiliary power is supplied when the amount of charge from the solar cell and the wind power generator is less than a predetermined value, natural energy is more effectively utilized and the energy saving effect is increased.

  According to invention of Claim 5, a solar cell, a wind power generator, and an illuminating lamp are attached to the upper part of a support | pillar, and electric circuits, such as an illumination sensor, an electric double layer capacitor, an output circuit, and a switch circuit, are the lower part of the said support | pillar. Since it is provided in the hollow part and the maintenance door that seals the hollow part is provided in the lower part of the column so that it can be opened and closed, the sunshine time for the solar cell becomes longer, and the wind generator can be easily hit by the wind. It is possible to store a larger capacity, the illuminating lamp can illuminate a wide range, the electric circuit is protected by a support column, and the maintenance door can be opened to easily maintain the electric circuit. it can.

Next, embodiments of the present invention will be described with reference to the drawings.
1 is a perspective view of an energy-saving outdoor lighting device according to the present invention, FIG. 2 is an electric circuit diagram of the device, FIG. 3 is a diagram showing an example of a specific configuration of the switch circuit of FIG. 2, and FIG. It is a figure explaining the effect | action corresponding to various conditions of a circuit.

  In FIG. 1, reference numeral 1 denotes a support erected on the ground, and a housing 2 is attached to the upper part of the support. An illuminating lamp 3 is provided in the housing 2 in such a direction that the light beam can illuminate a street or a garden. Also, in the preferred embodiment shown, the housing 2 extends symmetrically on both sides of the column so that it has a high stability and a well-balanced aesthetic, and each has a small size on its upper surface. A wind power generator 4 is attached.

  The support column 1 is further extended upward, and one or a plurality of panel type solar cells 5 are provided on the upper portion thereof. The support column 1 is further provided with an illuminance sensor 6. The illuminance sensor 6 approximately detects the illuminance (brightness) of the place where the outdoor lighting device is installed and its surroundings, and outputs a detection signal when detecting a preset illuminance. This is applied to the electrical circuit 7 shown in FIG.

  The wind power generator 4, the solar cell 5, and the illuminance sensor 6 are connected to an electric circuit 7 as shown in FIG. The electric circuit 7 includes a backflow prevention element 8 ′ and a charging circuit 8 having an overcharge prevention function, an electric double layer capacitor 9 charged by the charging circuit, and an output circuit 10 connected to the subsequent stage of the electric double layer capacitor 9. And a switch circuit 11 provided at the subsequent stage of the output circuit 10.

  The charging circuit 8 charges the electric double layer capacitor 9 as long as the outputs of the wind power generator 4 and the solar cell 5 do not reach the overcharge voltage of the electric double layer capacitor 9. 4 and 5 have the capacity | capacitance which produces | generates electric power smaller than the electric power which the illuminating lamp 3 consumes in one day. The electric double layer capacitor 9 is a known one and has a structure in which two different phases of activated carbon and an organic solvent are brought into contact with each other, and accumulates electric charges in the same manner as the capacitor without transferring electrons due to a chemical reaction during charging. Therefore, charging with a minute current can also be performed. For this reason, even when the amount of solar radiation such as rainy weather or cloudy weather is small and the output current of the wind power generator 4 or the solar battery 5 is small, charging can be performed. The electric power generated by the solar battery is stored, and the lighting lamp has a storage capacity capable of supplying electric power equal to or less than electric power consumed in one day. Therefore, it is preferable that the illuminating lamp 3 is composed of LEDs whose power consumption is as small as possible.

  When the electric power stored in the electric double layer capacitor is less than a predetermined value, for example, less than 12 V, the output circuit 10 causes the electric double layer capacitor 9 to charge the electric double layer capacitor 9 with electric power from the wind generator 4 or the solar cell 5. When the electric power stored in the multilayer capacitor is a predetermined value, for example, 12 V or more, the electric double layer capacitor 9 is controlled to discharge the electric power, and the electric double layer capacitor 9 is repeatedly charged and discharged every day. Is.

  The switch circuit 11 is connected to an illuminance sensor 6 and a commercial power supply line 12a having an AC adapter 12 at the tip as an example of an auxiliary power supply line. The AC adapter 12 converts a 100V AC power source into a 12V DC power source.

  As illustrated in FIG. 3, the switch circuit 11 includes, but is not limited to, a contact switching circuit 13 and a switching element 14. The output circuit 10 and the illuminance sensor 6 are connected to the contact switching circuit 13. The contact switching circuit 13 determines from the output level of the output circuit 10 whether the charging voltage of the electric double layer capacitor 9 is a specified value, for example, 12 V or more, and the measured value of the illuminance sensor 6 is a predetermined value or more. It is configured to check whether or not a detection signal that is sometimes output is input, and to operate the switching element 14 based on the check result.

As an example, the switching element 14 includes a movable contact 14a, a dummy fixed contact 14b, a first fixed contact 14c, and a second fixed contact 14d. The movable contact 14a is electrically connected to the illuminating lamp 3, the first fixed contact 14c is electrically connected to the output circuit 10, and the second fixed contact 14d is electrically connected to the commercial power supply line 12a. Further, when the contact switching circuit 13 inputs a detection signal from the illuminance sensor 6 (bright), that is, when the measurement value of the illuminance sensor is equal to or greater than a predetermined value, as shown in FIG. The movable contact 14a is brought into contact with the dummy fixed contact 14b to cut off the power supply from the electric double layer capacitor 9 to the illuminating lamp 3 and the commercial power supply from the commercial power supply line 12a to the illuminating lamp 3.
On the other hand, when the detection signal is not input from the illuminance sensor 6 (dark), that is, when the measurement value of the illuminance sensor is less than a predetermined value, when the output level of the output circuit 10 is equal to or higher than the predetermined value, When the charging voltage of the electric double layer capacitor 9 is equal to or higher than a predetermined value, the contact switching circuit 13 brings the movable contact 14a into contact with the first fixed contact 14c as shown in FIG. 4B. Thereby, while supplying electric power from the electric double layer capacitor 9 to the illuminating lamp 3, supply of commercial power from the commercial power supply line 12a to the illuminating lamp is cut off. Furthermore, when the measured value of the illuminance sensor is less than the predetermined value and the electric power accumulated in the electric double layer capacitor is less than the predetermined value, the contact switching circuit 13 is as shown in FIG. As a result of bringing the movable contact 14a into contact with the second fixed contact 14d, the commercial power is supplied from the commercial power supply line 12a to the illumination lamp 3, and the power supply from the electric double layer capacitor 9 to the illumination lamp 3 is cut off. Works.

  With the above configuration, when this outdoor lighting device is installed in a place where the wind generator 4 has good wind perception and the solar cell 5 has as much solar radiation as possible, and the AC adapter 12 is connected to a commercial power source, the amount of solar radiation during the daytime is increased. When the illuminance detected by the illuminance sensor 6 is greater than or equal to a predetermined value during a large period of time, the contact switching circuit 13 of the switch circuit 11 keeps the movable contact 14a in contact with the dummy fixed contact 14b. Therefore, the illumination lamp 3 is not turned on.

  On the other hand, when the illuminance detected by the illuminance sensor 6 is less than a predetermined value and the output level of the output circuit 10 is equal to or higher than the predetermined value in a time zone where the amount of solar radiation is small such as at night, the switch circuit 11 The contact switching circuit 13 holds the movable contact 14a in contact with the first fixed contact 14c. Accordingly, the output current from the electric double layer capacitor 9 is supplied to the illuminating lamp 3. On the day when the amount of sunshine in the daytime is large, a large amount of electric power is accumulated in the electric double layer capacitor 9, so that the illuminating lamp 3 is lit for a relatively long time only with the output current from the electric double layer capacitor 9.

  In the preferred embodiment, the electric storage capacity of the electric double layer capacitor 9 is smaller than the electric power consumed by the illuminating lamp 3 per day, so that the electric double layer capacitor 9 can be reduced in size, but the amount of solar radiation is small. On the day, there may be a case where the illumination lamp 3 cannot be turned on only by the output current from the electric double layer capacitor 9. In that case, when the charging voltage from the electric double layer capacitor 9 becomes smaller than a predetermined value and the output level of the output circuit 10 becomes lower than the predetermined value, the switch element 14 is moved by the action of the contact switching circuit 13. Since the contact 14a is moved to the second fixed contact 14d and the power supply source is switched from the electric double layer capacitor 9 to the commercial power source, the commercial power source is supplied thereafter. In addition, since the commercial power supply is supplementarily consumed only for a relatively short time, the power cost reduction effect by utilizing natural energy by solar cells is not reduced.

  The solar battery 5 is installed in any number that can generate electric power necessary to achieve the illuminance required for the illuminating lamp 3.

  It is preferable to add the wind power generator 4 of FIG. 1 when the place where the outdoor lighting device is installed is an area where the wind easily hits. Moreover, it is preferable to add it in order to entertain customers' eyes at tourist facilities or entertainment facilities. As indicated by the chain line in FIG. 2, this wind power generator 4 is connected in parallel with the solar cell 5 and connected to the charging circuit 8 via the backflow prevention element 8 ′ to generate power. The electric power is stored in the electric double layer capacitor 9, and the generated current is given to the first fixed contact 14 c of the switch circuit 11 through the output circuit 10. Therefore, the contact switching circuit 13 determines whether the single power generation of the solar battery 5, the single power generation of the wind power generator 4, or the total power generation of both is greater than or less than a predetermined value set according to the power consumption of the illumination lamp 3. Thus, it is determined whether to use the output current from the electric double layer capacitor 9 or the commercial power supply as the power for lighting the illumination lamp.

  As described above, the solar battery 5 and the wind power generator 4 having a power generation capacity smaller than the daily power consumption of the illuminating lamp are provided, and the electric power having a power storage capacity smaller than the daily power consumption of the illuminating lamp is provided therein. When the double layer capacitor 9 is connected, the output current is mainly used, and the commercial power supply can be used in addition to that, the natural energy can be used effectively and the lighting for the required time can be continued. A small and inexpensive outdoor lighting device can be provided.

  Although the mechanical switch configuration has been described above so that the switch circuit can be easily understood, it can be configured with an electronic circuit. A fuel cell can also be used as an auxiliary power source other than the natural energy utilization power source.

The perspective view in the use condition of an example of the outdoor illuminating device which concerns on this invention. The electric circuit diagram which shows an example of a structure of the electric circuit of the apparatus. FIG. 3 is an electric circuit diagram illustrating an example of a configuration of a switch circuit in FIG. 2. The action explanatory view corresponding to various conditions of the above-mentioned switch circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Housing | casing 3 Illumination light 4 Wind power generator 5 Solar cell 6 Illuminance sensor 8 Charging circuit 9 Electric double layer capacitor 10 Switch circuit 11 Commercial power supply line

Claims (5)

  A solar cell, an electric double layer capacitor that stores the electric power generated by the solar cell, an auxiliary power supply line other than natural energy, an illumination lamp, an illumination sensor that measures the illumination around the illumination lamp, and the illumination intensity When the measured value of the sensor is equal to or greater than a predetermined value, the power supply from the electric double layer capacitor to the illuminating lamp and the auxiliary power supply from the auxiliary power supply line to the illuminating lamp are cut off, and the illuminance sensor is measured. When the value is less than a predetermined value and the electric power accumulated in the electric double layer capacitor is greater than or equal to a predetermined value, electric power is supplied from the electric double layer capacitor to the illuminating lamp and the illumination from the auxiliary power supply line When the supply of auxiliary power to the lamp is cut off, the measured value of the illuminance sensor is less than a predetermined value, and the power accumulated in the electric double layer capacitor is less than a predetermined value Serial with interrupts power supply from the electric double layer capacitor to the lamp, outdoor lighting device comprising a switch circuit for supplying auxiliary power to the lamp from the auxiliary power supply line.   An illuminating lamp, a solar cell having a capacity for generating electric power smaller than the electric power consumed by the illuminating lamp per day, an electric power generated by the solar cell, and the electric power consumed by the illuminating lamp per day An electric double layer capacitor having a storage capacity capable of supplying equal or less electric power, an auxiliary power supply line other than natural energy, an illuminance sensor for measuring the illuminance around the illuminating lamp, and the illuminance sensor When the measured value is greater than or equal to a predetermined value, the power supply from the electric double layer capacitor to the illuminating lamp and the auxiliary power supply from the auxiliary power supply line to the illuminating lamp are cut off, and the measured value of the illuminance sensor is If the electric power stored in the electric double layer capacitor is less than a predetermined value and greater than or equal to a predetermined value, power is supplied from the electric double layer capacitor to the illuminating lamp and the compensation is performed. When the supply of auxiliary power from the power supply line to the illuminating lamp is cut off, the measured value of the illuminance sensor is less than a predetermined value, and the electric power accumulated in the electric double layer capacitor is less than a predetermined value An outdoor lighting device comprising a switch circuit that cuts off power supply from the electric double layer capacitor to the illuminating lamp and supplies auxiliary power from the auxiliary power supply line to the illuminating lamp.   3. The outdoor lighting device according to claim 1, wherein the solar cell and the illumination lamp are attached to an upper portion of the support column, and the illuminance sensor, the electric double layer capacitor, the output circuit, and the switch circuit are provided in a hollow portion of the lower portion of the support column. The outdoor lighting device is characterized in that a maintenance door for sealing the hollow portion is provided at a lower portion of the support so as to be freely opened and closed.   The outdoor lighting device according to claim 1 or 2, wherein a wind power generator is provided on an upper portion of the support column, and both the electric power generated by the wind power generator and the electric power generated by the solar cell are charged in the electric double layer capacitor. An outdoor lighting device.   5. The outdoor lighting device according to claim 4, wherein the solar cell, the wind power generator, and the illuminating lamp are attached to an upper portion of the support column, and the illuminance sensor, the electric double layer capacitor, the output circuit, and the switch circuit are disposed in a hollow portion at the lower portion of the support column. The outdoor lighting device is characterized in that a maintenance door for sealing the hollow portion is provided at a lower portion of the support so as to be freely opened and closed.

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