JP2019012674A - Led lighting fixture - Google Patents

Abstract

To provide an LED lighting fixture that can dim light without introducing an external light control device and can adjust the light with an external light control device if an external light control device is introduced.SOLUTION: In an LED lighting fixture 10, an LED element 21 and a dimming unit 36 for outputting a dimming signal for adjusting the brightness of the LED element 21 are housed in a housing 40, and the LED lighting fixture includes an instruction unit 50 that is accommodated in the housing 40 and that outputs an instruction signal for instructing the brightness of the LED element 21. When a first dimming signal from an external light control device 100 is detected, the first light control signal is selected, and when a first dimming signal is not detected, a second dimming signal to the LED element 21, which is generated in accordance with the instruction signal from the instruction unit 50 is selected, and the dimming unit 36 outputs the selected dimming signal to the LED element 21 as a dimming signal.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an LED lighting apparatus capable of dimming an LED element.

Many lighting fixtures are installed in facilities such as conference rooms, banquet halls and halls that can accommodate large numbers of people. As for lighting fixtures, installation of LED lighting fixtures using LED elements as light sources is progressing from the viewpoint of power consumption and lifetime. Then, an external dimmer is installed to dimm this LED lighting fixture at once, and the brightness can be adjusted steplessly or stepwise by operating the volume or switch of the external dimmer.
The thing described in patent document 1 is known as an illumination system provided with the external light control apparatus which adjusts the brightness of such LED lighting fixture.

  The illumination system described in Patent Literature 1 determines a dimming level of the illumination divided into at least one group, and a management device that outputs a dimming instruction based on the determined dimming level, and based on the dimming instruction, It is determined whether or not a transition to a state in which all the lights in the group are turned off, and when it is determined to transition to a state in which all the lights in the group are turned off, a power supply device that supplies power to the lighting And a control device that outputs an instruction to stop power supply to the lighting of the corresponding group.

JP 2016-24869 A

  One external light control device is expensive because it can continuously adjust the brightness of a plurality of LED lighting fixtures steplessly for each system, and wiring from the external light control device to the LED lighting fixture is required. Therefore, the introduction of an external dimming device may be postponed because it is determined that there is no problem even if dimming cannot be adjusted at any time in the facility design. In that case, since the external light control device is not installed, the LED lighting apparatus is installed in a state where the adjustment is fixed to a predetermined brightness.

However, when the brightness of the LED lighting fixture is too bright, the adjustment of the LED lighting fixture is fixed to a predetermined brightness and the brightness cannot be adjusted. In addition, since the electric power is consumed more than necessary, the energy saving effect required for the LED lighting apparatus may not be exhibited. Therefore, in reality, there is a risk of introducing an LED lighting apparatus in which the adjustment is fixed to a predetermined brightness without introducing an external dimmer.
In addition, even if an external light control device is introduced after the LED lighting device is installed to control the LED lighting device, the LED lighting device whose adjustment is fixed to a predetermined brightness cannot be used.

  Therefore, an object of the present invention is to provide an LED luminaire that can be dimmed even if an external dimmer is not introduced, and can be dimmed by the external dimmer if the external dimmer is introduced. And

  The LED lighting apparatus of the present invention includes an LED element, a dimming unit that outputs a dimming signal that adjusts the brightness of the LED element, and an instruction unit that outputs an instruction signal that instructs the brightness of the LED element. And a dimming unit that detects the presence or absence of a first dimming signal from an external dimming device, and a second dimming to the LED element based on an instruction signal from the instruction unit A signal generation unit that generates a signal; and when the detection unit detects a first dimming signal, the first dimming signal is selected, and when the first dimming signal is not detected, And a selection unit that selects the second dimming signal and outputs the second dimming signal as the dimming signal.

According to the LED lighting apparatus of the present invention, when the external light control device is not installed, the detection unit cannot detect the first light control signal from the external light control device. Therefore, the selection unit selects the second dimming signal to the LED element generated by the signal generation unit based on the instruction signal instructing the brightness of the LED element from the instruction unit, and adjusts the brightness of the LED element. Output as a dimming signal to be adjusted. Therefore, in the LED lighting apparatus of the present invention, the brightness of the LED element can be dimmed by the instruction unit.
In addition, when the external light control device is installed, the detection unit detects the first light control signal from the external light control device. Therefore, the selection unit selects the first dimming signal and outputs it as the dimming signal. Therefore, if an external light control device is installed, the brightness of the LED element can be adjusted by the first light control signal from the external light control device.

The instructing unit is formed by a switch and a cable with a connector for connecting to the dimming unit, and the signal generating unit is provided each time the switch is pressed and the instruction signal is output to the dimming unit. In addition, the dimming by the second dimming signal can be changed stepwise.
By configuring the instruction unit in this way, it is possible to instruct dimming of the LED element using only the switch.

The dimming unit preferably includes a non-volatile memory that stores a dimming setting instructed by the instruction unit to the signal generation unit.
Even if the power to the LED lighting apparatus of the present invention is cut off, turned off, and supplied with power again, the signal generator reads the value indicating brightness from the nonvolatile memory, and the value indicating the read brightness The second dimming signal can be generated based on the above. Accordingly, when the LED lighting apparatus of the present invention is installed in a facility, the indicator can be removed from the connector when the brightness adjustment is completed.

  A connection connector of a cable for transmitting the first dimming signal from the external dimming device or an input connector to which a connection connector of a cable from the instruction unit is alternatively connected can be provided. If two input connectors, one for connecting the cable from the external light control device and one for connecting the cable from the indicating unit, are provided separately, the connection connector may be mistakenly connected to the other input connector. There is. However, if there is only one input connector, the connector for connecting the cable from the external light control device or the connector for connecting the cable from the indicator is alternatively connected. Can be prevented from being connected to an input connector different from the input connector to be connected.

  The detection unit can detect the presence or absence of the first dimming signal based on a change in the first dimming signal by PWM control. If the first dimming signal is based on PWM control, the signal includes a rise and a fall from “L” to “H” and from “H” to “L”. By detecting a change in the first dimming signal, the detection unit can determine whether or not the external dimming device that outputs the first dimming signal is connected to the LED lighting apparatus of the present invention. .

  An output connector may be provided for outputting the dimming signal from the selection unit as a first dimming signal to a subsequent LED lighting apparatus. The first dimming signal and the second dimming signal are selected by the selection unit, and the output dimming signal is output from the output connector as the first dimming signal to the subsequent LED lighting fixture. The front LED lighting apparatus can be regarded as an external light control device.

  In the LED lighting apparatus of the present invention, the brightness of the LED element can be dimmed by the instruction unit unless an external dimming device is installed, and when the external dimming device is installed, from the external dimming device Since the brightness of the LED element can be adjusted by the first dimming signal, the dimming can be performed without the introduction of an external dimming device. Can be dimmed. Furthermore, since the brightness of the LED element can be adjusted, unnecessary power consumption can be suppressed as compared with the case where the LED element is too bright. Therefore, the LED lighting apparatus of the present invention can obtain an energy saving effect. .

It is a figure which shows the structure by which the LED lighting fixture which concerns on Embodiment 1 of this invention is connected according to every system | strain, and was connected to the external light control apparatus. It is a figure for demonstrating the structure of the LED lighting fixture shown in FIG. It is a figure for demonstrating the structure of the light control part of the LED lighting fixture shown in FIG. It is a figure of the waveform for demonstrating a 1st dimming signal, (A) is a figure which shows the waveform of the 1st dimming signal when the brightness is 100%, (B) is when the brightness is 0% It is a figure which shows the waveform of the 1st light control signal. It is a figure for demonstrating the structure of the LED lighting fixture which concerns on Embodiment 2 of this invention.

(Embodiment 1)
The LED lighting fixture which concerns on Embodiment 1 of this invention is demonstrated based on drawing.
The LED lighting fixture 10 shown in FIG. 1 is a linear fluorescent lamp type lighting fixture. The LED lighting fixtures 10 are connected for each system. When the external light control device 100 is installed, the foremost LED lighting fixture 10 is connected to the external light control device 100.

  As shown in FIG. 2, the LED lighting apparatus 10 includes a circuit board on which an LED board 20 on which the illumination unit 22 is mounted and a circuit component for dimming the brightness of the LED element 21 (illumination unit 22). 30 includes an instrument main body 10 m housed in a housing 40 and an instruction unit 50.

The illumination unit 22 is configured such that the LED elements 21 are connected in series, or the LED elements 21 connected in series are connected in parallel.
A power supply unit 31, a receiving unit 32, a driver unit 33, an input connector 34, an output connector 35, and a light control unit 36 are mounted on the circuit board 30.

The power supply unit 31 is connected to a power supply supplied from the external light control device 100 or a separately wired power supply, and supplies power for operating the components of each circuit in the circuit board 30. In the first embodiment, the power supply unit 31 receives, for example, AC 100V and outputs DC 5V, 3.3V, ± 12V, etc. for operating the circuit components.
The receiving unit 32 inputs a dimming signal (low active (negative logic) first dimming signal) from the external dimming device 100 and conforms to waveform shaping and the input voltage level of the dimming unit 36. In this way, the buffer adjusts the voltage level. The driver unit 33 is an amplifier circuit that amplifies the dimming signal from the dimming unit 36 and outputs the amplified dimming signal to the illumination unit 22.

  The input connector 34 is connected to a cable for inputting an external signal. The input connector 34 is connected to the external light control device 100, and is alternatively connected to the connection connector 102 of the cable 101 that transmits the first light control signal or the connection connector 53 of the cable 52 that is connected to the switch 51. .

By connecting the input connector 34 to the connection connector 102, the dimming signal line from the external dimming device 100 and the ground line for the dimming signal line are input to the dimming signal of the receiving unit 32. Connected to ground.
Further, when the input connector 34 is connected to the connection connector 53, one of the two signal lines from the switch 51 is input with the instruction signal of the dimming unit 36 in which one signal line is pulled up by the resistor R. And the other signal line is connected to the ground.
The input connector 34 preferably includes a reverse connection prevention mechanism that prevents insertion when the left and right are switched. The input connector 34 may be, for example, a connector having 4 pins based on the total number of signals from the external light control device 100 and the number of signals from the instruction unit 50, or 4 pins or more.

  The output connector 35 is for connecting a cable for transmitting a dimming signal to the LED lighting apparatus 10 at the subsequent stage.

The dimmer 36 has a built-in program called firmware, and has a non-volatile memory in which data is not erased even when the supply of power from the power source 31 is stopped. It can be a microcontroller that performs control.
As illustrated in FIG. 3, the light control unit 36 includes a detection unit 361, a signal generation unit 362, a selection unit 363, an inversion unit 364, and a nonvolatile memory 365.

The detection unit 361 detects the presence or absence of the first dimming signal from the external dimming device 100, and when the first dimming signal is detected, the first dimming signal is input and effective. Is output to the selection unit 363. When the first dimming signal is not detected, the first dimming signal is not input and a detection signal indicating that the first dimming signal is invalid is output to the selection unit 363.
The signal generation unit 362 generates a second dimming signal to the LED element 21 based on the instruction signal from the instruction unit 50. The second dimming signal is a low active (negative logic) PWM signal that controls the brightness by the pulse width in accordance with the negative logic first dimming signal.

The selection unit 363 outputs the dimming signal to the driver unit 33 via the inversion unit 364 and also to the output connector 35. The selection unit 363 selects the first dimming signal from the reception unit 32 when the detection signal indicates validity, and the second dimming signal from the signal generation unit 362 when the detection signal indicates invalidity. Is output to the driver unit 33.
The reversing unit 364 is connected to the driver unit 33. The inverting unit 364 inverts the voltage level of the negative logic first dimming signal from the external dimming device 100 from the selection unit 363 or the second dimming signal from the signal generation unit 362 to make high active (positive Output as logic).
The nonvolatile memory 365 stores the brightness setting by the signal generation unit 362.

The instruction unit 50 outputs an instruction signal for instructing the brightness of the LED element 21. The instruction unit 50 is formed by a switch 51 and a cable with a connector for connecting to the light control unit 36 via the input connector 34. The switch 51 is formed by, for example, a push button type switch, and when the switch 51 is pressed, the two signals are short-circuited. The cable with connector includes a cable 52 and a connection connector 53.
The instruction unit 50 has the switch 51 located outside the housing 40 so that the switch 51 can be operated from the outside of the housing 40, the cable 52 enters the housing 40, and the connection connector 53 is connected to the input connector 34. Yes. The cable 52 having a length of about 20 cm to about 2 m can be used.
The casing 40 has a long metal main body for housing the LED board 20 and the circuit board 30, and a long dome-shaped diffusion that diffuses light from the LED elements 21 of the LED board 20. Department.

The operation and use state of the LED lighting apparatus 10 according to the embodiment of the present invention configured as described above will be described with reference to the drawings. First, a state where the external light control device 100 is not installed will be described.
As shown in FIG. 2, when the external light control device 100 is not installed, the connection connector 53 of the instruction unit 50 is connected to the input connector 34, and the connection of the cable 101 from the external light control device 100 is performed. Since the connector 102 is not connected, the first dimming signal from the external dimming device 100 is not input to the receiving unit 32.

  The first dimming signal is a low-active PWM signal that controls brightness according to the pulse width. For example, as shown in FIG. 4A, the first dimming signal with 100% brightness has a long “L” period and a short “H” period, but “H” even when the brightness is 100%. There is a period. Further, as shown in FIG. 4B, the first dimming signal with 0% brightness has a long “H” period and a short “L” period, but “L” even when the brightness is 0%. There is a period. Therefore, the first dimming signal has a rise from “L” to “H” or a fall from “H” to “L” in any brightness. The detection unit 361 detects a rise from “L” to “H” or a fall from “H” to “L” as a change in the first dimming signal, so that the external dimming device 100 The presence or absence of the first dimming signal can be detected, and it can be determined whether or not the external dimming device 100 that outputs the first dimming signal is connected to the LED lighting fixture 10.

  When the cable from the external dimming device 100 shown in FIG. 2 is in a disconnected state, the first dimming signal is not input to the receiving unit 32. Therefore, the detection unit 361 of the dimming unit 36 shown in FIG. The first dimming signal cannot be detected. Therefore, since the detection signal from the detection unit 361 becomes invalid, the selection unit 363 selects the second dimming signal from the signal generation unit 362, and sends it to the driver unit 33 via the inversion unit 364 and to the output connector 35. Output to.

Here, the operation of the signal generation unit 362 that generates the second dimming signal will be described.
The signal generation unit 362 outputs the second dimming signal to the selection unit 363 with the brightness initially set in the nonvolatile memory 365. For example, the initial state of the second dimming signal can be set to 100% brightness.

  A connection connector 53 of the instruction unit 50 is connected to the input connector 34. Therefore, one of the two signals from the switch 51 shown in FIG. 2 is pulled up to the power supply voltage by the resistor R and input to the signal generation unit 362 of the dimming unit 36 shown in FIG. The other signal is grounded. Therefore, when the switch 51 is pressed, the two signals from the switch 51 are short-circuited by the switch 51, so that the signal input to the signal generation unit 362 becomes L level.

The user presses the switch 51 when changing the brightness. When the switch 51 is pressed, an L level signal is input to the signal generation unit 362 as an instruction signal for instructing the brightness of the LED element 21.
When the signal generation unit 362 detects the L level signal, for example, the signal generation unit 362 can use the second dimming signal with the brightness reduced to 90%. In the first embodiment, it is assumed that the display becomes dark each time the switch 51 is pressed. Accordingly, the signal generation unit 362 generates and outputs a second dimming signal whose brightness is reduced by one level, for example, the brightness is changed from 100% to 90%, and at the same time the brightness reduced by one level. The indicated value is stored in the nonvolatile memory 365.

When the user feels that it is still too bright, the switch 51 is pressed again. By doing so, the signal generation unit 362 generates and outputs the second dimming signal further darkened by one step, and stores a value indicating the brightness in the nonvolatile memory 365.
The brightness is gradually reduced to 60%, and when the brightness is further reduced, the brightness can be returned to 100%.
In this way, each time the switch 51 is pressed, the signal generation unit 362 changes from 100% of the initial state to 90%, 80%, 70%, 60%, and reaches the settable lower limit value again. Dimming control is performed to return to 100% of the state.

The signal generator 362 cyclically changes the brightness, so that even if there is only one switch 51, the brightness from 100% to 60% can be adjusted in a stepwise manner with the switch 51 alone. Can be directed to. Further, since the value indicating the brightness is stored in the nonvolatile memory 365, the previous brightness can be maintained even when the power is turned off and turned on again.
In the present embodiment, the signal generation unit 362 performs control such that the signal is gradually darkened according to an instruction from the instruction unit 50. However, control may be performed so that the signal is gradually brightened. Further, the brightness may be lowered to 0%.

  When the brightness is set by the instruction unit 50 illustrated in FIG. 1, the signal generation unit 362 stores a value indicating the brightness in the nonvolatile memory 365. Therefore, even if the power to the LED lighting apparatus 10 is cut off, the light is turned off, and the power is supplied again, the signal generation unit 362 reads the value indicating the brightness from the non-volatile memory 365 and sets the read brightness. A second dimming signal is generated based on the indicated value. Therefore, when the brightness adjustment is completed when the LED lighting apparatus 10 is installed in the facility, the connection connector 53 can be disconnected from the input connector 34 and the instruction unit 50 can be removed.

When the external light control device 100 is installed, the cable 101 from the external light control device 100 is connected to the input connector 34.
Accordingly, since the first dimming signal from the external dimming device 100 is input to the receiving unit 32, the detection unit 361 of the dimming unit 36 can detect the first dimming signal. Therefore, since the detection signal from the detection unit 361 is valid, the selection unit 363 selects the first dimming signal from the reception unit 32 and outputs it to the driver unit 33.

  The driver unit 33 amplifies the first dimming signal or the second dimming signal output as the dimming signal from the selection unit 363 and outputs it to the illuminating unit 22 so as to correspond to the pulse width of the PWM signal. The LED element 21 is dimmed in a short time.

  The dimming signal from the selection unit 363 is output to the output connector 35. A cable (not shown) connected to the input connector 34 of the LED lighting apparatus 10 at the subsequent stage is connected to the output connector 35.

The cable connected to the input connector 34 of the LED lighting apparatus 10 at the subsequent stage has the same pin assignment as that of the connection connector 102. Therefore, even if the external LED light fixture 10 is connected to the LED LED fixture 10 at the front stage, the LED lighting device 10 at the rear stage is adjusted by the instruction unit 50 when the external light control apparatus 100 is not connected. Even if instructed, the front LED lighting device 10 can be seen by the external light control device 100.
For this reason, the connected LED lighting fixture 10, which is drawn from the frontmost LED lighting fixture 10, dims the illumination unit 22 by the same operation as the frontmost LED lighting fixture 10 in a state where the external light control device 100 is connected. be able to. Therefore, dimming can be adjusted for every system | strain by connecting the LED lighting fixture 10 to the formula which changes.

  Since the connection connector 102 of the cable 101 from the external light control device 100 or the connection connector 53 of the cable 52 from the instruction unit 50 is alternatively connected to the input connector 34, when connecting to the input connector 34 It is possible to prevent the connection connectors 53 and 102 from being erroneously connected to other connectors.

As described above, according to the LED lighting apparatus 10 according to the first embodiment, when the external light control device 100 is not installed, the detection unit 361 does not detect the first light control signal from the external light control device 100. The unit 363 selects the second dimming signal for the LED element 21 generated by the signal generation unit 362 and outputs the second dimming signal for adjusting the brightness of the LED element 21. Therefore, in the LED lighting device 10, the brightness of the LED element 21 can be dimmed by the instruction unit 50.
When the external light control device 100 is installed, the detection unit 361 detects the first light control signal from the external light control device 100, so that the selection unit 363 selects the first light control signal. Since it outputs as a light control signal, if the external light control apparatus 100 is installed, the brightness of the LED element 21 can be adjusted with the 1st light control signal.

  Therefore, the LED lighting apparatus 10 can be dimmed even if the external dimmer 100 is not introduced, and can be dimmed by the external dimmer 100 if the external dimmer 100 is introduced.

  Moreover, even if there is a variation in the brightness of the LED lighting fixtures 10, the brightness can be unified because each LED lighting fixture 10 can be adjusted by the instruction unit 50. When the brightness of the LED lighting device 10 is individually adjusted, the output lighting device 35 and the input connector 34 of the LED lighting device 10 in the subsequent stage are not connected with a cable. The second dimming signal is not transmitted to the subsequent stage as the dimming signal. Therefore, in the front LED lighting device 10 and the unconnected LED lighting device 10, the individual brightness setting adjusted by the instruction unit 50 can be validated.

(Embodiment 2)
The LED lighting fixture which concerns on Embodiment 2 of this invention is demonstrated based on drawing. In FIG. 5, the same components as those in FIG.
The LED lighting apparatus 11 according to the second embodiment includes an apparatus main body 10n, an instruction unit 60 that instructs brightness by radio waves, and an instruction unit 70 that instructs brightness by infrared rays.

  The instruction unit 60 for instructing brightness by radio waves is mounted on the circuit board 30 of the instrument body 10n and the wireless transmission device 61 that transmits a wireless signal from the outside of the housing 40, and receives the wireless signal from the wireless transmission device 61. And a decoder 63 that decodes a signal received by the antenna 62 and outputs the decoded signal to the dimming unit 36.

  The instruction unit 70 for instructing the brightness by infrared rays is mounted on the circuit board 30 of the instrument body 10n and the infrared transmission device 71 that transmits an infrared signal from the outside of the housing 40, and receives the infrared signal from the infrared transmission device 71. And a light receiver 72 that outputs the light to the light control unit 36.

  For example, when the brightness of the LED element 21 is adjusted using the instruction unit 60, the antenna 62 receives the instruction signal transmitted from the wireless transmission device 61, and the decoder 63 decodes and outputs it to the dimming unit 36. As a result, a signal similar to that the switch 51 shown in FIG.

  Further, when the brightness of the LED element 21 is adjusted using the instruction unit 70, the light receiver 72 receives the instruction signal transmitted from the infrared transmission device 71 and outputs the instruction signal to the light control unit 36, so that FIG. The same signal as when the switch 51 shown in FIG.

  When the instruction signal from the decoder 63 and the instruction signal from the light receiver 72 are input to the dimming unit 36, the dimming unit 36 receives the instruction signal from any of the instruction units 50, 60, and 70 in FIG. The signal generator 362 shown generates the second dimming signal. Since the subsequent steps are the same as the dimming by the instruction unit 50, the description thereof is omitted.

Thus, since it can operate from the exterior of the housing | casing 40 of the LED lighting fixture 11, brightness can be adjusted even from a distant place.
It should be noted that it is desirable to switch several types of the frequency of the radio signal of the instruction unit 60 and the pulse by the infrared signal of the instruction unit 70 so that other LED lighting devices do not malfunction.

  The LED lighting apparatus of the present invention is suitable not only in a wide place where an external light control device is used, but also in a place where only one lamp is installed.

DESCRIPTION OF SYMBOLS 10,11 LED lighting fixture 10m, 10n Appliance main body 20 LED board 21 LED element 22 Illumination part 30 Circuit board 31 Power supply part 32 Reception part 33 Driver part 34 Input connector 35 Output connector 36 Light control part 361 Detection part 362 Signal generation part 363 Selection unit 364 Inversion unit 365 Non-volatile memory 40 Housing 50 Instruction unit 51 Switch 52 Cable 53 Connection connector 60 Instruction unit 61 Wireless transmission device 62 Antenna 63 Decoder 70 Instruction unit 71 Infrared transmission device 72 Light receiver 100 External dimming device 101 Cable 102 Connector R resistance

Claims (6)

An LED element; a dimming unit that outputs a dimming signal that adjusts the brightness of the LED element; and an instruction unit that outputs an instruction signal that instructs the brightness of the LED element;
The dimming unit generates a second dimming signal to the LED element based on a detection unit that detects the presence or absence of a first dimming signal from an external dimming device and an instruction signal from the instruction unit A signal generation unit that selects the first dimming signal when the detection unit detects the first dimming signal, and the second dimming signal when the first dimming signal is not detected. An LED lighting apparatus comprising: a selection unit that selects a dimming signal and outputs the dimming signal. The indicating unit is formed by a switch and a cable with a connector for connecting to the dimming unit,
2. The LED lighting apparatus according to claim 1, wherein the signal generation unit changes the dimming by the second dimming signal stepwise each time the switch is pressed and the instruction signal is output.   The LED light fixture according to claim 2, wherein the dimming unit includes a non-volatile memory that stores a dimming setting instructed by the instruction unit to the signal generation unit.   4. A connection connector for a cable for transmitting the first dimming signal from the external dimming device, or an input connector to which a connection connector for a cable from the instruction unit is alternatively connected. LED lighting fixture of description.   5. The LED lighting apparatus according to claim 1, wherein the detection unit detects the presence or absence of the first dimming signal based on a change in the first dimming signal by PWM control.   The LED lighting fixture according to claim 1, further comprising an output connector for outputting the dimming signal from the selection unit as a first dimming signal to a subsequent LED lighting fixture.

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