JP2010272440A - Cooling type led lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling type LED lighting device capable of demonstrating an illumination function of a minimum degree even if a failure occurs. <P>SOLUTION: The cooling type LED lighting device 1 comprises a light source unit 3 having LEDs as a light source, a water cooling unit 5 having a water-cooled jacket 20, a radiator 21, a circulation pump 23, and a fan 22, and an air cooling unit 4 having a circuit case (heat sink) 14 arranged in the vicinity of the light source unit 3. Then, when the cooling function of the water cooling unit 5 is impaired, the lighting device lowers electric current supplied to the light source unit 3 up to a value so that the heat amount that is emitted by the light source unit 3 can be suppressed to the heat amount or less that can be absorbed by the air cooling unit 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hybrid cooling LED lighting device including a water cooling unit and an air cooling unit for cooling a light source unit.

  In recent years, lighting devices such as vehicular headlamps and outdoor lighting lamps have a long-life, low-power consumption LED as a light source, from a light source that uses a high-intensity lamp such as a mercury lamp, xenon lamp, or sodium lamp. Replacement with the LED is progressing, and further higher output is desired for the LED illumination device using LEDs as a light source.

  By the way, currently popular xenon lamps have a large output of about 200 W to 2000 W, and the power input to the LED lighting device as a substitute for this tends to increase. Recently, the power input to one LED lighting device is increasing. The thing whose electric power exceeds 200W has been developed.

  Since the amount of heat generated by the LED light source unit increases as the power of the LED lighting device increases, a cooling structure for driving the LED light source whose lifetime and output change depending on the temperature stably at a lower temperature. Has become an important development issue. As its cooling structure, for example, in Patent Document 1, the LED mounting substrate is pressed and fixed to a metal heat dissipation fixing plate by a metal heat dissipation cover, and the heat dissipation fixing plate to which the LED mounting substrate is fixed is referred to as a translucent cover. The structure which arrange | positions in the sealed space formed of the resin case, and forms a some heat radiating fin in the heat radiating fixed plate is proposed. In this configuration, heat generated by the LED light source is conducted to the heat radiating fixing plate via the LED mounting substrate, and also conducted to the heat radiating fixing plate via the heat radiating cover, and the heat conducted to the heat radiating fixing plate is radiated. The LED light source is cooled because it is diffused from the fins through the resin case to the atmosphere.

  Further, Patent Document 2 discloses an LED as a light source, a heat sink capable of air-cooling or cooling the LED, a light-emitting circuit that applies a current for causing the LED to emit light, and a water droplet that detects that the lighting device is in water. In a lighting device equipped with a sensor, when the water drop sensor detects that the lighting device is not in water, the light emitting circuit limits the current supplied to the LED to prevent overheating of the LED, and the lighting device is in water A configuration has been proposed in which a light emitting circuit supplies a high current to an LED to increase the light emission luminance of the LED.

  Further, Patent Document 3 proposes an air cooling system using a heat sink and a cooling system using both an air cooling system and a liquid cooling system.

JP 2002-299700 A JP 2003-047914 A Special table 2007-537490 gazette

  By the way, in the LED lighting apparatus provided with the water cooling system or the water cooling system and the air cooling system, there is almost no failure of the LED as the light source, and the failure occurs exclusively in the water cooling system having an operation unit such as a circulation pump and a fan. When a failure occurs in the water cooling system, even if an air cooling system is provided, the LED lighting device must be turned off to prevent the LED from overheating. There is a problem in that extinction due to failure in a place involving dangerous work such as a plant causes a great risk.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a cooling type LED lighting device that can exhibit a minimum lighting function even if a failure occurs.

In order to achieve the above object, the invention according to claim 1
A light source unit using an LED as a light source;
A water cooling unit comprising a water cooling jacket, a radiator, a circulation pump and a fan;
An air cooling unit including a heat sink disposed in proximity to the light source unit, and a cooling type LED lighting device is configured.

  According to a second aspect of the present invention, in the first aspect of the invention, the heat sink of the air-cooling unit is constituted by heat radiation pins or fins formed on a circuit case disposed in close contact with the water-cooling jacket of the water-cooling unit. It is characterized by.

  A third aspect of the present invention is characterized in that, in the first aspect of the present invention, the heat sink of the air cooling unit is configured by heat radiation pins or heat radiation fins formed on a water cooling jacket of the water cooling unit.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, when the cooling function of the water cooling unit is impaired, the amount of heat that the light source unit emits the current supplied to the light source unit. Is reduced to a value that can be suppressed below the amount of heat that can be absorbed by the air cooling unit.

  The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4, the light source unit and the air cooling unit are disposed on both sides of the water cooling jacket of the water cooling unit. To do.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein a water cooling jacket of the water cooling unit, the air cooling unit, a radiator of the water cooling unit, and a fan are arranged in order from the light source unit. And

  According to the present invention, when the cooling function is impaired due to a failure of a water cooling unit having an operating part such as a circulation pump or a fan, the current supplied to the light source unit is reduced, and the amount of heat released by the light source unit is reduced to the air cooling unit. If the amount of heat is suppressed below the amount of heat that can be absorbed, the light source unit is prevented from being overheated, and the LED illumination device functions as an illumination device without being turned off, although the amount of light is reduced.

It is a perspective view of the cooling type | mold LED illuminating device which concerns on Embodiment 1 of this invention. It is a figure of the arrow A direction of FIG. It is a figure of the arrow B direction of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is a disassembled perspective view of the cooling type | mold LED illuminating device which concerns on Embodiment 1 of this invention. It is a basic block diagram of the water cooling unit of the cooling LED lighting apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the illumination intensity distribution in the output 200W. It is a figure which shows the illumination intensity distribution in the output 50W. It is a figure which shows the illumination intensity distribution in output 10W. It is a perspective view of the state which removed the housing of the cooling type LED lighting apparatus which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the cooling type | mold LED illuminating device which concerns on Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a perspective view of a cooling type LED lighting device according to Embodiment 1 of the present invention, FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is a view in the direction of arrow B in FIG. 3 is a sectional view taken along the line CC in FIG. 3, FIG. 5 is a sectional view taken along the line DD in FIG. 3, FIG. 6 is a sectional view taken along the line EE in FIG. FIG. 8 is a basic configuration diagram of a water cooling unit of the cooling type LED lighting device.

  As shown in FIGS. 4 to 7, the cooling type LED lighting device 1 according to the first embodiment of the present invention incorporates a light source unit 3, an air cooling unit 4, and a water cooling unit 5 inside a rectangular box-shaped housing 2. It is configured. In addition, the upper and lower sides of the cooling type LED lighting apparatus 1 in the following description are in the state shown in FIG. 1, and the cooling type LED lighting apparatus 1 is not necessarily installed in the state shown in FIG.

  The housing 2 is made of a resin such as PC or a metal such as aluminum. As shown in FIG. 1, an air inlet 6 composed of a plurality of longitudinally long slits is formed on the peripheral surface of the housing 2. Is formed with an exhaust port 7 composed of a plurality of fan-shaped slits. The lower surface of the housing 2 is open, and the light source unit 3 is fitted and fixed in the opening.

  As shown in FIGS. 4 to 7, the light source unit 3 includes a plurality (9 in the illustrated example) of metal substrates 9 on which LEDs 8 (see FIG. 8) as light sources are mounted, and these metal substrates 9. A rectangular plate-like base 10 to be attached and a rectangular plate-like transparent resin lens 11 fitted into the lower surface opening of the housing 2 are included. In FIG. 7, reference numeral 12 denotes a cable connector.

  In the present embodiment, the nine metal substrates 9 on which the LEDs 8 are mounted are arranged in a matrix of three rows and columns, and correspondingly, the base 10 made of aluminum die-casting also has the same number of pedestals as the LEDs 8. 10a (refer to FIG. 4 and FIG. 6) is integrally projected in a matrix form of three rows. Each metal substrate 9 is fixed to each pedestal 10a of the base 10 with screws through a rectangular heat conductive sheet 13. In addition, each heat conductive sheet 13 is comprised with the silicon | silicone etc. with insulation and high heat conductivity.

  In the air cooling unit 4, as shown in FIG. 7, a rectangular box-shaped circuit case 14 whose bottom surface is open functions as a heat sink, and various electronic components (not shown) are mounted inside the circuit case 14. The circuit board 15 is assembled, and the lower surface opening is covered with a rectangular plate-like cover 16. Here, the circuit case 14 is formed by aluminum die casting or the like having a high thermal conductivity, and a large number of heat radiation pins 17 constituting a heat radiation portion are integrally projected on the upper surface thereof. A circuit board 15 is in close contact with the inner upper surface of the circuit case 14 via a rectangular heat conductive sheet 18 made of silicon or the like having high insulation and thermal conductivity. Note that an O-ring 19 is interposed at the joint between the circuit case 14 and the cover 16, and the inside of the circuit case 14 is sealed by the sealing action of the O-ring 19, and water or the like from the outside into the circuit case 14. Intrusion is prevented. Further, in the present embodiment, the heat dissipation pin 17 protrudes from the circuit case 14, but a heat dissipation fin may be formed in the circuit case 14 instead of the heat dissipation pin 17.

  As shown in FIGS. 4 to 8, the water cooling unit 5 includes a water cooling jacket 20 that is a heat exchanger, and heat of the cooling water that has received heat in the water cooling jacket 20 and is heated to the outside air (cooling air). A radiator 21 for cooling by replacement, a fan 22 for supplying cooling air to the radiator 21, a circulation pump 23 for circulating the cooling water in a closed loop circulation path, and a reserve tank 24 for storing the cooling water. 22 is disposed above the radiator 21 so as to face it.

  By the way, the water cooling jacket 20 is formed in a hollow rectangular plate shape, and a cooling water passage is formed therein as shown in FIGS. As shown in FIGS. 5 and 7, an inlet pipe 25 into which cooling water cooled by heat exchange with the outside air (cooling air) in the radiator 21 flows on one end of the cooling jacket 10, and the water cooling An outlet pipe 26 is provided to discharge the cooling water whose temperature has been increased by receiving heat in the jacket 20.

  Thus, in the present embodiment, as shown in FIGS. 4 and 6, the water cooling jacket 20 is horizontally disposed at the bottom of the lower portion in the housing 2, and air cooling is performed above and below the water cooling jacket 20. A unit 4 and a light source unit 3 are arranged. Here, the light source unit 3 disposed on the lower surface side of the water cooling jacket 20 has its base 10 in close contact with the lower surface of the water cooling jacket 20 via a rectangular heat conduction sheet 27. In the present embodiment, the heat conductive sheet 27 is made of silicon or the like having high insulation and thermal conductivity.

  The air cooling unit 4 is disposed on the upper surface side of the water cooling jacket 20 with the cover 16 in close contact with the upper surface of the water cooling jacket 20. In this embodiment, an antifreeze liquid obtained by mixing water with propylene glycol is used as the cooling water.

  On the other hand, as shown in FIGS. 4 and 6, the radiator 21 and the fan 22 are disposed in the upper part of the housing 2 apart from the water cooling jacket 20, and a space portion is provided between the water cooling jacket 20 and the radiator 21. S is formed, and the air cooling unit 4, the circulation pump 23, and the reserve tank 24 are disposed in the space S. Specifically, a gate-shaped chassis 28 is erected on the water cooling jacket 20, the air cooling unit 4 is arranged in a space surrounded by the chassis 28, and the circulation pump 23 and the reserve tank 24 are provided on the chassis 28. is set up.

  Here, as shown in FIGS. 5 and 8, a pipe (rubber hose) 29 rising upward from the outlet pipe 26 of the water cooling jacket 20 is connected to the inlet pipe 30 of the radiator 21, and from the outlet pipe 31 of the radiator 21. The extending pipe (rubber hose) 32 extends downward and is bent at a substantially right angle and connected to the suction side of the circulation pump 23. A pipe (rubber hose) 33 extending from the discharge side of the circulation pump 23 is connected to the inlet side of the reserve tank 24 as shown in FIG. 8, and a pipe (rubber hose) 34 extending downward from the outlet side of the reserve tank 24. Is connected to the inlet pipe 25 of the water cooling jacket 20. Thus, the water cooling jacket 20, the radiator 21, the circulation pump 23, and the reserve tank 24 are connected by the pipes (rubber hoses) 29, 32 to 34 to form a circulation path that forms an open loop. Circulation provides the required cooling action.

  Thus, when the cooling LED lighting device 1 configured as described above is activated and power is supplied to the light source unit 3, the circuit board 15 in the circuit case 14, and the water cooling unit 5, a plurality of light source units 3 ( In this embodiment, nine LEDs 8) emit light, and the light passes through the lens 11 and is irradiated downward in FIG. 1 to illuminate the front, but the lighting control of the light source unit 3 is controlled by a circuit case. 14, the LED 8 of the light source unit 3 and various electronic components (not shown) of the circuit board 15 generate heat during driving, and the light source unit 3 and the circuit board 15 are overheated and the temperature rises as it is. .

  However, in this embodiment, the water cooling unit 5 is driven simultaneously, and the circuit case 14 as the heat sink of the light source unit 3 and the air cooling unit 4 is forcibly cooled by the cooling water circulating in the circulation path shown in FIG. The temperature rise is suppressed. The heat generated in the light source unit 3 and the circuit board 15 is conducted to the circuit case 14, and is radiated from the surface of the circuit case 14 and a large number of heat radiation pins 17. The cooling air is introduced into the exhaust port 7 and flows toward the exhaust port 7.

  In the water cooling unit 5, the cooling water circulated through the circulation path by the circulation pump 23 receives heat generated in the light source unit 3 and the circuit board 15 in the water cooling jacket 20 and receives the light source unit 3, the circuit case 14, and the circuit board in the light source unit 3. The cooling water that has cooled 15 and received heat and having a high temperature is introduced into the radiator 21 through the pipe 29.

  On the other hand, when the fan 22 is rotationally driven by a motor (not shown), the outside air is sucked from the side as the cooling air from the air inlet 6 formed in the peripheral surface of the housing 2, and this cooling air is supplied to the water cooling jacket. 20 flows upward through a space S formed between 20 and the radiator 21, passes through the radiator 21 in the process, and is discharged to the outside through the exhaust port 7 opened on the upper surface of the housing 2. In the radiator 21, the heat of the cooling water is radiated to the outside by the cooling air passing through the radiator 21 to cool the cooling water, and the cooling liquid water whose temperature has decreased is sucked into the circulation pump 23 through the pipe 32. Is done.

  The cooling water sucked into the circulation pump 23 is boosted and then sent out from the circulation pump 23 through the pipe 33 to the reserve tank 24, a part of which is stored in the reserve tank 24, and the remaining cooling water is stored in the reserve tank 24. Is introduced into the water-cooling jacket 20 through the pipe 34 and used for cooling the light source unit 3, the circuit case 14, and the circuit board 15 in the light source unit 3. The above operation (cooling cycle) is continuously repeated, and the light source unit 3, the circuit case 14, and the circuit board 15 are forcibly cooled by the cooling water flowing through the water cooling jacket 20, and their temperature rise is suppressed to a certain value or less. It is done.

  Thus, in the present embodiment, since the control circuit unit 4 and the light source unit 3 are disposed above and below the water cooling jacket 20, the cooling water circulates in the closed loop circulation path by the circulation pump 23. The light source unit 3, the circuit case 14, and the circuit board 15 disposed on both sides of the jacket 20 are simultaneously forcibly cooled by the cooling water. Further, the circuit case 14 and the circuit board 15 are air-cooled by heat radiation from the air-cooling unit 4. As a result, the temperature rise of these light source units 3 and the circuit board 15 is suppressed, and high output of the water-cooled LED lighting device 1 is realized.

  In the present embodiment, the lower surface of the circuit case 14 is brought into close contact with the water cooling jacket 20, and a large number of heat radiating pins 17 constituting the heat radiating portion are provided on the upper surface, so that the circuit case 14 is forcibly cooled by the cooling water. At the same time, natural heat is radiated from the heat radiating pins 17, so that the circuit case 14 and the circuit board 15 in the circuit case 14 are efficiently cooled, and the temperature rise is more effectively suppressed.

  Furthermore, in the present embodiment, the entire surface of the light source unit 3 is in close contact with the lower surface of the water-cooling jacket 20 via the heat conductive sheet 27 having a high thermal conductivity. The light source unit 3 is efficiently cooled by the cooling water flowing through the cooling jacket 20. For this reason, it is difficult to bring the entire surface of the light source unit 3 into close contact with the water cooling jacket 20 without using the heat conductive sheet 27. In fact, the light source unit 3 is only partially in contact with the water cooling jacket 20. It is impossible to increase efficiency. Alternatively, in order to bring the entire surface of the light source unit 3 into close contact with the water-cooling jacket 20 without using the heat conductive sheet 27, the joint surface of the metal water-cooling jacket 20 as well as the metal base 10 of the light source unit 3 is polished or the like. The finishing process may be performed smoothly, but such finishing process is not realistic because it requires a great number of man-hours, time and cost.

  In the present embodiment, since the air cooling unit 4 is disposed in the space portion S formed between the water cooling jacket 20 and the radiator 21 of the water cooling unit 5, the cooling air introduced into the housing 2 by the fan 22 is space. By flowing through the portion S, the circuit case 14 and the circuit board 15 are forcibly air-cooled, and the circuit case 14 and the circuit board 15 that are forcibly cooled by the cooling water are further efficiently cooled, and their temperature rise is effectively suppressed. The effect is also obtained.

  Thus, in the cooling type LED device 1 according to the present invention, when the cooling function of the water cooling unit 5 is impaired due to a failure of the fan 22 or the circulation pump 23 which is an operation part of the water cooling unit 5, the light source unit 3 The heat supplied from the light source unit 3 is reduced to a value at which the amount of heat emitted by the light source unit 3 can be suppressed to be equal to or less than the amount of heat that can be absorbed by the air cooling unit 4.

  Therefore, when the cooling function of the water cooling unit 5 is impaired due to a failure, the current supplied to the light source unit 3 is reduced, and the amount of heat released by the light source unit 3 can be absorbed by the air cooling unit 4, that is, a circuit. Since the amount of heat released by natural heat radiation from the case 14 and the heat radiation pin 17 is suppressed to less than the amount of heat, the light source unit 3 is prevented from being overheated. It functions as a lighting device. For this reason, for example, the lights are prevented from being turned off due to a failure in a place involving dangerous work such as a gas station or a chemical plant, and safety is ensured.

  In the cooling type LED lighting device 1 according to the present embodiment, when the air cooling unit 4 and the water cooling unit 5 are functioning normally, the output in the range where the junction temperature of the LED 8 does not exceed 100 ° C. is 200 W. The illuminance distribution at this time is shown in FIG. 9, and as can be seen from FIG. 9, 8 m square can be illuminated with an illuminance of 5 lx or more. The illuminance in this case is a value when the LED lighting device is installed at a height of 6 m (the illuminance distribution shown in FIGS. 10 and 11 is the same). In FIG. 9, the vertical axis is the distance in the horizontal direction on the ground, the horizontal axis is the distance in the front-rear direction on the ground, and the numbers in the figure indicate illuminance (lx) (the same applies to FIGS. 10 and 11). ).

  When a failure occurs in the water cooling unit 5 and its cooling function is impaired, if the supply current to the light source unit 3 is reduced as described above, the reduction in output can be suppressed to 50 W, which is 1/4 of the normal value 200 W. it can. In this case, although it becomes dark, the function as illumination is not impaired. The illuminance distribution at this time is shown in FIG. 10. As is clear from the figure, a 6 m square can be illuminated with an illuminance of 5 lx or more.

  Incidentally, in the LED lighting apparatus that does not include the air cooling unit 4 but includes only the water cooling unit 5, when the water cooling unit 5 fails, only the natural heat radiation from the surface of the water cooling jacket 20 occurs. The output in a range not exceeding 100 ° C. is 10 W which is 1/20 of the normal value 200 W. The illuminance distribution at this time is shown in FIG. 11, and as is clear from the figure, the illumination range of illuminance 5 lx is narrowed to within 3 m.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 12 is a perspective view of the cooled LED lighting device according to Embodiment 2 of the present invention with the housing removed, and FIG. 13 is a longitudinal sectional view of the LED lighting device.

  The water-cooled LED lighting device 1 ′ according to the present embodiment is characterized in that the heat sink of the air-cooling unit 4 is composed of a large number of heat radiation pins 17 formed on the water-cooling jacket 20 of the water-cooling unit 5. This is the same as that of the water-cooled LED unit 1 according to the first embodiment. Accordingly, in FIGS. 12 and 13, the same elements as those shown in FIGS. 1 to 8 are denoted by the same reference numerals, and repetitive description thereof will be omitted below.

  Thus, also in the present embodiment, as in the first embodiment, when the cooling function of the water cooling unit 5 is impaired due to a failure of the fan 22 or the circulation pump 23 which is the operating part of the water cooling unit 5. The amount of heat supplied to the light source unit 3 is reduced to a value at which the amount of heat emitted by the light source unit 3 can be suppressed below the amount of heat that can be absorbed by the air cooling unit 4.

  Therefore, when the cooling function of the water cooling unit 5 is impaired due to a failure, the current supplied to the light source unit 3 is reduced, and the amount of heat released by the light source unit 3 is the amount of heat that can be absorbed by the air cooling unit 4, that is, water cooling. Since the amount of heat released by the natural heat radiation from the jacket 20 and the heat radiating pin 17 is suppressed to less than the amount of heat, the overheating of the light source unit 3 is prevented, and the water-cooled LED lighting device 1 ′ is reduced in light amount, but not turned off. It is possible to obtain the same effect as the first embodiment that functions as a lighting device.

  In the present embodiment, the radiating pins 17 are formed on the water cooling jacket 20, but radiating fins may be formed on the water cooling jacket 20 instead of the radiating pins 17. Further, the radiating pins 17 and the radiating fins may be formed integrally with the water cooling jacket 20, or the separate radiating pins 17 and the radiating fins may be fixed to the water cooling jacket 20 by brazing, caulking, screw fastening, or the like. good. When fixing the separate radiating pin 17 or the radiating fin to the water cooling jacket 20 by brazing or the like, the pin or fin may be a spring-like thin metal or a bellows-like thin metal, and the shape of the natural radiating portion As a heat sink, a commonly used heat sink can be used as it is.

1, 1 'Water-cooled LED lighting device 2 Housing 3 Light source unit 4 Air-cooling unit 5 Water-cooling unit 6 Intake port 7 Exhaust port 8 LED
DESCRIPTION OF SYMBOLS 9 Metal board 10 Base 10a Base 11 Lens 12 Cable connector 13 Thermal conduction sheet 14 Circuit case 15 Circuit board 16 Cover 17 Radiation pin 18 Thermal conduction sheet 19 O-ring 20 Water cooling jacket 21 Radiator 22 Fan 23 Circulation pump 24 Reserve tank 25 Water cooling jacket inlet pipe 26 Water cooling jacket outlet pipe 27 Heat conduction sheet 28 Chassis 29 Piping (rubber hose)
30 Radiator inlet pipe 31 Radiator outlet pipe 32-34 Piping (rubber hose)
S space

Claims (6)

A light source unit using an LED as a light source;
A water cooling unit comprising a water cooling jacket, a radiator, a circulation pump and a fan;
An air cooling unit comprising a heat sink disposed in proximity to the light source unit;
A cooling type LED lighting device comprising:   2. The cooling type LED lighting device according to claim 1, wherein the heat sink of the air cooling unit is constituted by a heat radiating pin or a heat radiating fin formed on a circuit case arranged in close contact with a water cooling jacket of the water cooling unit.   The cooling type LED lighting device according to claim 1, wherein the heat sink of the air cooling unit is configured by a heat radiating pin or a heat radiating fin formed on a water cooling jacket of the water cooling unit.   When the cooling function of the water cooling unit is impaired, the current supplied to the light source unit is reduced to a value at which the amount of heat emitted from the light source unit can be suppressed below the amount of heat that can be absorbed by the air cooling unit. Item 4. The cooling LED lighting device according to any one of Items 1 to 3.   The cooling type LED lighting device according to any one of claims 1 to 4, wherein the light source unit and the air cooling unit are disposed on both sides of a water cooling jacket of the water cooling unit.   The cooling type LED lighting device according to any one of claims 1 to 5, wherein a water cooling jacket of the water cooling unit, the air cooling unit, a radiator of the water cooling unit, and a fan are arranged in order from the light source unit.

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