JP2022056124A - Illumination system - Google Patents

Abstract

To provide an illumination system capable of attaining less variations in degradation between a plurality of lighting apparatuses with different lighting time while having sufficiently high brightness.SOLUTION: An illumination system (100) includes: lighting apparatuses (1, 3) with at least one LED element (11, 31); a lighting apparatus (2) having at least one LED element (21) with the same characteristic as the LED elements (11, 31); and a control section (20) which controls lighting of the LED elements (11, 21, 31) so that the lighting apparatus (2) lights for a longer time than the lighting apparatuses (1, 3) and controls driving currents (Ia, Ib) to run, through the LED element (21), a smaller driving current (Ib) than a driving current (Ia) running through the LED elements (11, 31).SELECTED DRAWING: Figure 1

Description

The present invention relates to a lighting system including a plurality of lighting fixtures.

In recent years, LED lighting has become widespread from the viewpoint of energy saving and the like. Among the LED lighting, in the awning lighting incorporated in the ceiling, the luminaire may be formed in a rectangular shape or the like having a relatively large area. Further, in such a tent lighting, a spotlight or a downlight may be arranged between a plurality of lighting fixtures arranged side by side and used as a nightlight.

However, when a plurality of lighting fixtures are arranged without a gap, there is no space for arranging the nightlight. Therefore, for example, some of the plurality of lighting fixtures used as the main lighting are turned on instead of the nightlight, and the other lighting fixtures are turned off for energy saving. The lighting time of the luminaire used for both the main lighting and the nightlight is longer than the lighting time of the luminaire used only for the main lighting.

By the way, although an LED has a longer life than a fluorescent lamp or the like, it deteriorates over time after many years of use. Therefore, even in a lighting fixture having LEDs having the same characteristics, the degree of deterioration of the LEDs differs depending on the lighting time. For this reason, there are variations in brightness, color, etc. between the lighting fixtures used only for the main lighting and the lighting fixtures used as nightlights. In awning lighting, such variations are more noticeable between adjacent luminaires.

For example, Patent Document 1 describes that, among a plurality of LED elements provided in a lighting fixture, some LED elements provided in a certain range are sequentially turned on or dimmed as a nightlight.

In order to suppress the above-mentioned variation, it is conceivable to apply the technique described in Patent Document 1 and use a plurality of lighting fixtures as nightlights in order. As a result, the degree of deterioration between the lighting fixtures can be made uniform. However, in the operation of such a lighting fixture, the lighting position of the nightlight is not constant, so that the floor illuminance distribution constantly changes.

On the other hand, in Patent Document 2, although it is not lighting, when the luminous intensity after a change with time based on the integrated lighting time of a specific LED is calculated and the other LED and the specific LED are turned on at the same time, another LED is used. Described are display devices that match the luminous intensity of an LED with the luminous intensity of a particular LED over time.

When such lighting control is applied to the above-mentioned awning lighting, the lighting fixture used only for the main lighting is not deteriorated as compared with the lighting fixture used as a nightlight, but has the same brightness as the lighting fixture. The lighting is controlled so that it becomes a sword. This makes it possible to reduce the variation in characteristics among all luminaires.

Patent No. 5628626 Patent No. 5825048

However, when the lighting control as described in Patent Document 2 is applied to the awning lighting, the brightness of the plurality of lighting fixtures as a whole is unified to the brightness of the lighting fixtures that are also used as nightlights. In addition, it becomes darker than when the above lighting control is not performed. Therefore, it is required that the overall brightness of a plurality of lighting fixtures can be sufficiently ensured without performing the lighting control as described above.

One aspect of the present invention is to reduce the variation in the degree of deterioration among a plurality of lighting fixtures having different lighting times while ensuring sufficient brightness.

In order to solve the above problems, the lighting system according to one aspect of the present invention includes a first luminaire having at least one first LED element and at least one second LED element having the same characteristics as the first LED element. The second luminaire and the first luminaire are controlled to light the first LED element and the second LED element so that the second luminaire is lit for a longer time than the first luminaire, and the first LED element is fed to the first LED element. It includes a control unit that controls the first drive current and the second drive current so that a second drive current smaller than the drive current flows through the second LED element.

According to one aspect of the present invention, it is an object of the present invention to reduce the variation in the degree of deterioration among a plurality of lighting fixtures having different lighting times while sufficiently ensuring the brightness.

It is a block diagram which shows the structure of the lighting system which concerns on Embodiment 1 of this invention. It is a plain view which shows the structure of the lighting fixture in the said lighting system. It is a top view which shows the elevator hall where the said lighting fixture is installed. It is a block diagram which shows the structure of the lighting system which concerns on Embodiment 2 of this invention.

[Embodiment 1]
The first embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a block diagram showing a configuration of a lighting system 100 according to the first embodiment. FIG. 2 is a plain view showing the configuration of the lighting fixture 4 in the lighting system 100.

As shown in FIG. 1, the lighting system 100 includes lighting fixtures 1 to 3, a driving unit 10, and a control unit 20.

The luminaires 1 to 3 each have at least one LED element 11,21,31. The characteristics of the LED elements 11, 21, and 31 are all the same. In this embodiment, a configuration in which a plurality of LED elements 11, 21, and 31 are provided in each of the lighting fixtures 1 to 3 will be described.

The drive unit 10 supplies a drive current to each of the LED elements 11 and 21 and 31 so as to drive the LED elements 11 and 21 and 31. The drive unit 10 has a power supply (not shown) for driving, and also has one transistor and one resistor (not shown) for each of the LED elements 11 and 21 and 31. The power supply outputs a specified value of DC voltage.

The cathodes of the LED elements 11, 21, and 31 are connected to the negative electrode terminal (grounding line) of the power supply via a transistor. The anodes of the LED elements 11, 21, and 31 are connected to the positive electrode terminal (power supply line) of the power supply via a resistor. A control signal output from the control unit 20 is input to the control terminal of the transistor.

The control unit 20 controls the drive current that the drive unit 10 passes through the LED elements 11, 21, and 31. The control unit 20 is composed of, for example, a microcontroller having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an I / O, and the like.

The control unit 20 controls the output of the drive current so that the LED element 21 is lit for a longer time than the LED elements 11 and 31. Further, the control unit 20 controls the drive current at least according to the normal lighting mode and the partial lighting mode. The normal lighting mode is a lighting mode in which all of the LED elements 11 and 21, 31 are lit, and the partial lighting mode is a lighting mode in which only the specific LED element 21 (second LED element) is lit and the other LED elements 11 and 31 ( This is a lighting mode in which the first LED element) is turned off.

The control unit 20 has a clock unit 30, a storage unit 40, and a drive current control unit 50 in order to control the drive current.

The clock unit 30 is provided to provide time information to the drive current control unit 50. The time information may not be provided by the clock unit 30, or may be provided from the outside.

The storage unit 40 is composed of, for example, the above ROM. The storage unit 40 stores control data. The control data is set according to the lighting mode as data of the value of the drive current flowing through the LED elements 11, 21, 31 of the lighting fixtures 1 to 3, respectively.

For example, in the normal lighting mode, control data is set such that the drive current Ia (first drive current) is passed through the LED elements 11 and 31 and the drive current Ib (second drive current) is passed through the LED element 21 (Ia). > Ib). Further, in the partial lighting mode, control data is set such that the drive current Ia of the LED elements 11 and 31 is set to 0 and the drive current Ib is passed through the LED element 21.

The drive current control unit 50 generates a PWM (Pulse Width Modulation) type control signal based on the control data, that is, the value of the drive current. The transistor of the drive unit 10 operates on and off according to the duty ratio of the control signal from the drive current control unit 50, so that the magnitude of the current flowing through the LED elements 11 and 21 and 31 is different.

FIG. 2 shows a lighting fixture 4 for explaining a configuration common to the lighting fixtures 1 to 3. The lighting fixture 4 is a ceiling-embedded lighting fixture, and has a substrate 41, a plurality of LED elements 42, and a panel 43.

The substrate 41 is rectangular (square or rectangular). The LED elements 42 are mounted on the substrate 41 so as to be arranged in a matrix at predetermined intervals. A power supply, a transistor, a resistor, and the like constituting the drive unit 10 are also mounted on the substrate 41. The shape of the substrate 41 is not limited to a rectangle, and may be, for example, a circle or an ellipse.

The panel 43 is a cover that covers the substrate 41 and is formed in a flat plate shape by a resin. The panel 43 is non-transparent like milky white and has translucency.

The lighting fixture 4 does not have to be a ceiling-embedded type, and may be a ceiling-mounted lighting fixture.

Subsequently, the operation of the lighting system 100 configured as described above will be described.

FIG. 3 is a plan view showing an elevator hall in which lighting fixtures 1 to 3 are installed.

The lighting fixtures 1 to 3 are incorporated in the ceiling of the elevator hall of the building, for example, as shown in FIG. There is no daylight incident in the elevator hall. The lighting fixtures 1 to 3 are arranged adjacent to each other. The lighting fixtures 1 to 3 may be arranged without a gap, or may be arranged at intervals.

Further, the number of LED elements 21 of the lighting fixture 2 (second lighting fixture) is larger than the number of LED elements 11 and 31 of the lighting fixtures 1 and 3 (first lighting fixture). The number of LED elements 11 and 31 of the lighting fixtures 1 and 3 is the same. For example, the number of LED elements 21 of the lighting fixture 2 is 200, and the number of LED elements 11 and 31 of the lighting fixtures 1 and 3 is 100.

The control unit 20 is incorporated in a control system provided in the management center of the building. The control unit 20 may be arranged in the form of a control device in the vicinity of the lighting fixtures 1 to 3 (for example, behind the ceiling or behind the wall).

Based on the time information of the clock unit 30, the control unit 20 lights all the lighting fixtures 1 to 3 in the normal lighting mode in the predetermined time zone, while the control unit 20 lights the lighting fixtures 1 to 3 in the partial lighting mode in the other predetermined time zone. 2 is turned on and lighting fixtures 1 and 3 are turned off. For example, the control unit 20 lights all the lighting fixtures 1 to 3 during 8 hours in the daytime (9:00 to 17:00), while lighting at night (17:00 to 9:00) and on holidays (mainly Saturday and Sunday). Only the fixture 2 is turned on. As a result, the lighting fixture 2 can be turned on as a nightlight.

In the above example, the luminaire 2 is lit for 168 hours and the luminaires 1 and 3 are lit for 40 hours on a weekly basis. As described above, the lighting time of the lighting fixture 2 is 4.2 times the lighting time of the lighting fixtures 1 and 3.

In the lighting in the normal lighting mode, the drive current control unit 50 generates a control signal so that the drive current Ib smaller than the drive current Ia to be passed through the LED elements 11 and 31 is passed through the LED element 21. If the drive current Ib is 50% of the drive current Ia, the amount of light of the LED element 21 is half that of the LED elements 11 and 31. However, as described above, if the number of LED elements 21 is 200 and the number of LED elements 11 and 31 of the lighting fixtures 1 and 3 is 100, the amount of light as the lighting fixture 2 can be increased. As a result, the brightness of the lighting fixture 2 can be made substantially the same as the brightness of the lighting fixtures 1 and 3.

By the way, in general, the deterioration of LED changes exponentially. Specifically, the LED maintains 100% brightness until a certain usage time, but when the usage time is exceeded, the brightness sharply decreases. As the brightness of the LED decreases, the color of the light also changes. Further, the deterioration rate (degree of deterioration, speed at which the life is reached) of the LED is in a linear inverse proportional relationship with the calorific value (temperature) of the LED, and the deterioration of the LED is more likely to proceed as the calorific value is larger. Since the amount of heat generated is proportional to the power consumption of the LED and the power consumption is proportional to the drive current, the deterioration of the LED is more likely to proceed as the drive current is larger.

Therefore, the smaller the drive current, the slower the deterioration rate of the LED. In the above case, since the drive current Ib is 50% of the drive current Ia, the LED element 21 deteriorates twice as slowly as the LED elements 11 and 31.

Further, in general, the longer the lighting time of the LED, the more the deterioration progresses. Here, for convenience of explanation, it is assumed that the deterioration rate and the lighting time have a substantially proportional relationship. Therefore, since the LED element 21 has a longer lighting time than the LED elements 11 and 31, the deterioration rate is faster than that of the LED elements 11 and 31. As described above, the lighting time of the LED element 21 is 4.2 times the lighting time of the LED elements 11 and 31, which means that the deterioration rate of the LED element 21 is 4.2 of the deterioration rate of the LED elements 11 and 31. It will be doubled.

In order to reduce the deterioration rate of the LED element 21 to the same level as the deterioration rate of the LED elements 11 and 31, the number of the LED elements 21 may be 4.2 times the number of the LED elements 11 and 31. Thereby, in order to make the light amount of the LED element 21 about the same as the light amount of the LED elements 11 and 31, the drive current Ib can be reduced to about 24% (≈1 / 4.2) of the drive current Ia.

However, if the number of the LED elements 21 is 4.2 times that of the LED elements 11 and 31, the lighting fixture 2 becomes expensive and the economic efficiency is lowered. Therefore, it is desirable to reduce the difference in the number of the LED elements 21 with respect to the LED elements 11 and 31 as much as possible to reduce the difference in the deterioration rate between the LED elements 21 and the LED elements 11 and 31.

If the drive current Ib is set to 50% of the drive current Ia by suppressing the number of the LED elements 21 to twice the number of the LED elements 11 and 31, the deterioration rate of the luminaires 1 and 3 will be that of the luminaire 2. This means that it is twice the deterioration rate. As a result, the lighting time of the lighting fixtures 1 and 3 is 40 hours in the normal lighting mode, whereas the lighting time of the lighting fixture 2 corresponds to 20 hours, which is the actual time in the normal lighting mode. Since 128 hours, which is the actual time in the partial lighting mode, corresponds to 64 hours, it is reduced to a total of 84 hours. Therefore, the difference of 4.2 times the deterioration rate of the LED elements 11 and 31 with respect to the deterioration rate of the LED element 21 can be reduced by 2.2 times.

In order to reduce the above difference, the drive current control unit 50 controls the LED element 21 to a drive current Ic smaller than the drive current Ib in the normal lighting mode in the partial lighting mode. Specifically, the drive current Ic is 31.25% of the drive current Ib. As a result, regarding the lighting time of the lighting fixture 2, 40 hours, which is the real time in the normal lighting mode, is still equivalent to 20 hours, but 128 hours, which is the real time in the partial lighting mode, is further reduced to 20 hours. Therefore, it is equivalent to 40 hours in total. In this way, the difference in drive current can offset the above difference. Therefore, the deterioration rate of the LED element 21 can be made to be substantially the same as the deterioration rate of the LED elements 11 and 31.

As described above, when the drive current Ic is passed through the LED element 21, the brightness of the luminaire 2 in the normal lighting mode is reduced to about 31.25% in the partial lighting mode. When such dimming control is performed in the normal lighting mode, the lighting fixture 2 becomes darker than the lighting fixtures 1 and 3. However, in the partial lighting mode, since the lighting fixtures 1 and 3 are turned off, even if the lighting fixture 2 is darker than the normal lighting mode, the lighting fixtures 1 and 3 are lit as in the normal lighting mode. There is no need to match the brightness.

Further, the control unit 20 lights the lighting fixtures 1 to 3 with 100% brightness in the normal lighting mode. On the other hand, the control unit 20 may light the lighting fixtures 1 and 3 with 100% brightness and the lighting fixture 2 with, for example, 90% brightness in the normal lighting mode. The human eye cannot recognize the difference in brightness up to 70% with respect to 100% brightness, but the difference in brightness is recognized when it becomes darker than 70%.

As a result, in the normal lighting mode, there is no problem even if there is a difference in brightness of the above degree between the lighting fixtures 1 and 3 and the lighting fixture 2. However, the closer the lighting fixtures 1 to 3 are, the easier it is for people to feel the difference in brightness. Therefore, it is desirable to adjust the dimming rate of the luminaire 2 according to the interval between the luminaires 1 to 3.

Further, the number of LED elements 21 of the lighting fixture 2 may be reduced according to the amount that the degree of acceleration of the deterioration rate of the LED element 21 can be reduced by lowering the dimming rate of the lighting fixture 2. As a result, the price of the luminaire 2 can be reduced without changing the deterioration rate of the LED element 21.

As described above, the lighting system 100 includes a control unit 20 that controls the lighting of the LED elements 11, 21, and 31. The control unit 20 controls the lighting of the LED elements 11 and 21, 31 so that the LED element 21 is lit for a longer time than the LED elements 11 and 31. Further, the control unit 20 controls the drive current so that a drive current smaller than the drive current flowing through the LED elements 11 and 31 is passed through the LED element 21.

As a result, the temperature of the LED element 21 can be made lower than the temperature of the LED elements 11 and 31, so that the deterioration rate of the LED element 21 can be made slower than the deterioration rate of the LED elements 11 and 31. Therefore, since the lighting time of the LED element 21 is longer than the lighting time of the LED elements 11 and 31, the deterioration rate of the LED element 21 becomes faster than the deterioration rate of the LED elements 11 and 31 can be reduced. Therefore, the deterioration rate of the LED element 21 can be made close to the deterioration rate of the LED elements 11 and 31. Further, in the normal lighting mode, the lighting fixtures 1 to 3 are lit with 100% brightness, so that sufficient brightness can be secured.

Therefore, in the long-term use of the lighting system 100, even if the lighting times of the lighting fixtures 1 and 3 and the lighting fixture 2 are different, the brightness and the tint between the lighting fixtures 1 and 3 and the lighting fixture 2 are different. Differences such as can be made inconspicuous. Therefore, by using only the lighting fixture 2 as a night lamp or the like, even if the lighting time is longer than that of the lighting fixtures 1 and 3, the lighting fixtures 1 and 3 and the lighting fixture 2 when the lighting fixtures 1 to 3 are turned on It is possible to make it difficult to feel the difference in performance between the two.

Further, more LED elements 21 may be provided than the LED elements 11 and 31. As a result, in order to make the brightness of the luminaires 1 and 3 the same as that of the luminaire 2, it is easily realized that the drive current Ib flowing through the LED element 21 is smaller than the drive current Ia flowing through the LED elements 11 and 31. can do.

Further, the lighting fixtures 1 to 3 have LED elements 11, 21, 31 translucent and non-transparent panels 43, respectively. As a result, the LED elements 11, 21, and 31 are covered with the panel 43 and become invisible. Therefore, the difference in the numbers of the LED elements 21 and the LED elements 11 and 31 cannot be seen. Therefore, the design of the lighting fixtures 1 to 3 can be enhanced.

The panel 43 may be transparent. As a result, the LED elements 11 and 21, 31 can be seen, so that the difference in the numbers of the LED elements 21 and the LED elements 11 and 31 can be understood. Therefore, it is possible to easily distinguish that the lighting control is different depending on the LED element 21 and the LED elements 11 and 31. Therefore, maintenance of the lighting fixtures 1 to 3 can be facilitated.

By the way, in the present embodiment, for the sake of simplification of the explanation, the deterioration rate of the LED is linearly inversely proportional to the drive current and linearly proportional to the lighting time. On the other hand, the deterioration characteristic (for example, the LM-80 life prediction formula) disclosed for each LED element is stored in the storage unit 40, and the control unit 20 compares the deterioration characteristic with the actual lighting time. Accordingly, it may be controlled to correct the dimming rate of the lighting fixture 2 on a weekly basis.

The lighting system 100 has three lighting fixtures 1 to 3, but may have a larger number of lighting fixtures. Further, the lighting fixture to be turned on in the partial lighting mode is not limited to the lighting fixture 2. This also applies to the second embodiment described below.

[Embodiment 2]
Embodiment 2 of the present invention will be described below with reference to FIG. In the present embodiment, the same reference numerals will be added to the components having the same functions as the components in the first embodiment, and the description thereof will be omitted.

FIG. 4 is a block diagram showing the configuration of the lighting system 100A according to the second embodiment.

As shown in FIG. 4, the lighting system 100A includes the lighting fixtures 1 to 3 and the drive unit 10 as in the lighting system 100 in the first embodiment. Further, the lighting system 100A includes a control unit 20A instead of the control unit 20 of the lighting system 100. Like the control unit 20, the control unit 20A has a clock unit 30, a storage unit 40, a drive current control unit 50, and further has a cooling control unit 60.

The luminaire 2 further has a fan 22 for cooling the LED element 21. The fan 22 cools the LED element 21 by creating an air flow in the space of the luminaires 1 to 3 closed by the panel 43.

The cooling control unit 60 controls the operation of the fan 22 so as to operate the fan 22 in the partial lighting mode and stop the fan 22 (cooling unit) in the normal lighting mode based on the time information of the clock unit 30.

As a result, the temperature of the LED element 21 of the lighting fixture 2 is lowered, so that the deterioration rate of the LED element 21 can be lowered. Therefore, the deterioration rate of the LED element 21 and the deterioration rate of the LED elements 11 and 31 can be made easier to approach.

The cooling control unit 60 operates the fan 22 in the partial lighting mode and stops the fan 22 in the normal lighting mode, but the fan 22 may also be operated in the normal lighting mode. As a result, the deterioration rate of the LED element 21 can be further reduced.

Further, the cooling control unit 60 may control the operation of the air conditioning system 70 so as to cool the LED element 21 in the normal lighting mode. Specifically, the cooling control unit 60 controls the operation of the air conditioning system 70 so that the cooling operation is performed only in the elevator hall described above in the partial lighting mode. As a result, the temperature of the LED element 21 of the lighting fixture 2 is lowered, so that the deterioration rate of the LED element 21 can be lowered. Therefore, the deterioration rate of the LED element 21 and the deterioration rate of the LED elements 11 and 31 can be made easier to approach.

[Example of implementation by software]
The control block (particularly, the control unit 20) of the lighting system 100 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software.

In the latter case, the lighting system 100 includes a computer that executes instructions of a control program that is software that realizes each function. The computer includes, for example, at least one processor and at least one computer-readable recording medium that stores the control program. Then, in the computer, the processor reads the control program from the recording medium and executes it, thereby achieving the object of the present invention.

As the processor, for example, the CPU described above can be used. As the recording medium, a "non-temporary tangible medium", for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used in addition to the above-mentioned ROM or the like. Further, in order to expand the control program, the above-mentioned RAM or the like may be further provided. Further, the control program may be supplied to the computer via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the control program.

〔summary〕
The lighting system according to the first aspect of the present invention includes a first luminaire having at least one first LED element, a second luminaire having at least one second LED element having the same characteristics as the first LED element, and the first luminaire. 2 The lighting of the first LED element and the second LED element is controlled so that the luminaire is lit for a longer time than the first luminaire, and the second drive current smaller than the first drive current flowing through the first LED element is controlled. The first drive current and the control unit for controlling the second drive current are provided so as to flow the current through the second LED element.

According to the above configuration, the temperature of the second LED element having a small drive current is lower than that of the first LED element having a large drive current because the amount of heat generated is smaller. Therefore, the second LED element deteriorates more slowly than the first LED element. As a result, even if the second luminaire is lit for a longer time than the first luminaire, the deterioration rate of the first LED element of the first luminaire and the deterioration rate of the second LED element of the second luminaire can be easily brought close to each other. be able to. Further, when the first luminaire and the second luminaire are all lit, the first luminaire and the second luminaire can be lit with the same brightness. Therefore, sufficient brightness can be ensured.

In the lighting system according to the second aspect of the present invention, in the first aspect, a plurality of the first LED element and the second LED element are both provided, and the number of the second LED elements is larger than the number of the first LED elements. You may.

According to the above configuration, even if the drive current of the second LED element is smaller than the drive current of the first LED element, the number of the second LED elements is larger than the number of the first LED elements, so that the illuminance of the second luminaire can be increased. Can be enhanced. As a result, the difference in illuminance between the first luminaire and the second luminaire can be reduced.

In the lighting system according to the third aspect of the present invention, in the second aspect, the first luminaire and the second luminaire have a translucent and non-transparent panel covering the first LED element and the second LED element, respectively. You may have.

According to the above configuration, the first LED element and the second LED element are covered with the panel and become invisible. As a result, the difference in the number of the first LED element and the second LED element cannot be recognized. Therefore, the design of the first luminaire and the second luminaire can be enhanced.

The lighting system according to the fourth aspect of the present invention may further include a cooling unit for cooling the second LED element in any one of the above aspects 1 to 3.

According to the above configuration, since the temperature of the second LED element is lowered, the deterioration of the second LED element can be delayed. Thereby, the deterioration rate of the first LED element of the first luminaire and the deterioration rate of the second LED element of the second luminaire can be made easier to approach.

[Additional notes]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. Further, an embodiment obtained by appropriately combining the technical means disclosed in different embodiments is also included in the technical scope of the present invention. Further, by combining the technical means disclosed in each embodiment, new technical features can be formed.

1,3 Lighting equipment (1st lighting equipment)
2 Lighting equipment (second lighting equipment)
11,21,31,42 LED element 20,20A Control unit 22 Fan (cooling unit)
70 Air conditioning system (cooling unit)
100,100A Lighting system Ia Drive current (1st drive current)
Ib drive current (second drive current)

Claims (4)

A first luminaire with at least one first LED element and
A second luminaire having at least one second LED element having the same characteristics as the first LED element, and a second luminaire.
The lighting of the first LED element and the second LED element is controlled so that the second luminaire is lit for a longer time than the first luminaire, and the second is smaller than the first drive current flowing through the first LED element. A lighting system including a control unit that controls the first drive current and the second drive current so that a drive current flows through the second LED element. The lighting system according to claim 1, wherein a plurality of the first LED element and the second LED element are provided, and the number of the second LED elements is larger than the number of the first LED elements. The lighting according to claim 2, wherein the first luminaire and the second luminaire have a translucent and non-transparent panel covering the first LED element and the second LED element, respectively. system. The lighting system according to any one of claims 1 to 3, further comprising a cooling unit for cooling the second LED element.

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