JP2019071257A - Illumination control system - Google Patents

Abstract

To provide an illumination control system capable of determining the highly-reliable number of transmissions with certainty according to an environment.SOLUTION: An illumination control system comprises: a plurality of illuminating fixtures in each of which an operational state of a light source part is controlled depending on a control signal received at a wireless part; and a controller that can transmit the control signal and a response confirmation signal to the plurality of illuminating fixtures, and that can receive a response signal transmitted from each of the plurality of illuminating fixtures in response to the reception of the response confirmation signal. The controller transmits the response confirmation signal to all illuminating fixtures a predetermined number of times (S14), counts and stores the number of receptions of the response signal from each illuminating fixture (S16), and determines the number of transmissions of the control signal at a normal time on the basis of the number of transmissions of the response confirmation signal and the number of receptions of the response signal (S18).SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a lighting control system.

  Conventionally, Patent Document 1 proposes a lighting control system in which the reception intensity of a lighting fixture is checked against frequency shift due to temperature rise, and the number of times of controller transmission is increased to improve communication accuracy.

Unexamined-Japanese-Patent No. 2004-265793

  The illumination control system described in Patent Document 1 has a problem that it is difficult to reliably determine the number of highly reliable transmissions according to the environment only by setting the number of transmissions associated with each reception strength. In addition, the number of transmissions can not be reduced only by increasing the number of transmissions.

  An object of the present disclosure is to reliably determine the number of reliable transmissions in accordance with the environment based on the number of transmissions of response acknowledgment signals sent from the controller to all the lighting fixtures and the number of receptions of lighting fixture response signals. Providing a lighting control system that can

  A lighting control system according to the present disclosure includes a plurality of lighting fixtures including a wireless unit and a light source unit, the operating state of the light source unit being controlled according to a control signal received by the wireless unit, and the plurality of lighting fixtures And a controller capable of transmitting a control signal and a response confirmation signal thereto, and capable of receiving response signals respectively transmitted from the plurality of lighting fixtures in response to the reception of the response confirmation signal. Then, the controller transmits the response confirmation signal to all the luminaires a predetermined number of times, counts and stores the number of receptions of the response signal from each luminaire, and stores the number of transmissions of the response confirmation signal. The number of transmissions of the control signal at the normal time is determined based on the number of reception of the response signal.

  According to the lighting control system according to the present disclosure, the number of times of highly reliable transmission according to the environment based on the number of transmissions of the response confirmation signal sent from the controller to all the lighting devices and the number of receptions of the response signals of each lighting device Can be determined with certainty.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the illumination control system which is 1st Embodiment of this indication. FIG. 6 is a block diagram illustrating a controller and one luminaire included in the lighting control system. It is a flowchart which shows the process performed by a controller at the time of a power supply start or an update button depression. It is a table which shows the result of a process of FIG. 3, and a figure which shows the formula used for determination of the number of control signal transmissions. Fig. 5 is a flow chart showing a process performed by the controller prior to transmission of a control signal to the lighting fixture. In a lighting control system of a 2nd embodiment of this indication, it is a flow chart which shows processing performed by a controller at the time of power supply starting or update button pressing-down. It is a figure which shows the table which shows the result of the process shown in FIG.

  Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the attached drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present disclosure, and can be appropriately changed in accordance with applications, purposes, specifications, and the like. In addition, in the case where a plurality of embodiments, modified examples, and the like are included below, it is assumed from the beginning that these characteristic portions are appropriately combined and used.

  FIG. 1 is a schematic configuration diagram of the illumination control system 10 according to the first embodiment. As shown in FIG. 1, the lighting control system 10 includes a controller C and a plurality of lighting fixtures L1, L2, ..., Ln. The controller C is installed, for example, in a facility such as an office, a factory, or a warehouse. Each lighting fixture L1, L2, ..., Ln is installed on the ceiling or wall of the above-mentioned facility. Here, “n” in the present embodiment is an integer of 3 or more, but may be 2 or more.

  The controller C transmits control signals for controlling the operating states of the respective lighting fixtures L1, L2, ..., Ln. The above operation state includes lighting, extinguishing, light control, toning, and the like. Each lighting fixture L1, L2, ..., Ln can have the same configuration. Therefore, when not distinguishing each lighting fixture below, it is called "a lighting fixture L."

  FIG. 2 is a block diagram showing a controller C and one lighting fixture L included in the lighting control system 10.

  As shown in FIG. 2, the controller C includes an operation unit 12, a control unit 14, a memory 16, a wireless unit 18, and an antenna 20. The controller C may also include a timer 21.

  The operation unit 12 may include a power switch for powering on the controller C. In addition, the operation unit 12 may include a display panel or a light emitting unit that indicates an operation state (for example, a power on state, a radio wave transmission / reception state, and the like) of the controller C. Furthermore, the operation unit 12 has an update button 13. The update button 13 may be, for example, a mechanical push button switch, or an operation button displayed on a touch panel display panel. When the update button 13 is pressed, the processing shown in FIG. This process will be described later.

  The control unit 14 is preferably configured by a microcomputer including a CPU (Central Processing Unit) and the like that reads and executes programs and the like stored in the memory 16.

  The memory 16 is, for example, a storage unit such as a RAM, a ROM, or a flash memory. In the memory 16, a program for executing processing to be described later is stored in advance. The program may be updated or changed after the installation of the controller C by communication by the antenna 20 and the wireless unit 18 described later.

  In the controller C, a control signal for controlling the operation state of the lighting fixture L may be generated by the control unit 14 or may be relayed from the external device via the antenna 20 and the wireless unit 18. It may be transmitted to the lighting fixture L. Here, the external device may be a wall-mounted switch or a portable switch (a remote controller, a smartphone, a tablet, or the like). In addition, the control unit 14 has a function of generating signals such as a response confirmation signal and a reception strength confirmation signal used in the process described later.

  The wireless unit 18 converts the control signal, the response confirmation signal, the reception strength confirmation signal, etc. into a radio signal and outputs the radio signal to the antenna 20, and extracts the response signal and the reception strength signal from the radio wave received by the antenna 20. And has a function of outputting to the control unit 14.

  The antenna 20 has a function of transmitting / receiving a signal to / from the lighting device L or the like by wireless communication. For example, a diversity antenna can be suitably used as the antenna 20.

  As shown in FIG. 2, the lighting fixture L includes an antenna 22, a wireless unit 24, a control unit 26, a memory 28, a lighting circuit 30, and a light source unit 32.

  The antenna 22 has a function of transmitting / receiving a signal to / from the controller C by wireless communication. For example, an inverted F antenna, a chip antenna, or the like can be suitably used as the antenna 22.

  The wireless unit 24 has a function of extracting a control signal, a response confirmation signal, and a reception strength confirmation signal from the wireless signal received by the antenna 22 and outputting the control signal, to the control unit 26. Further, the wireless unit 24 has a function of converting a response signal, a reception strength signal, and the like input from the control unit 26 into a wireless signal and outputting the signal to the antenna 22.

  The control unit 26 generates and outputs a drive signal for the lighting circuit 30 for supplying power to the light source unit 32 in accordance with the control signal transmitted from the controller C. The memory 28 is a storage unit that stores programs and data necessary for controlling the operation state of the lighting fixture L in advance. The control unit 26 and the memory 28 can be configured substantially the same as those described for the controller C.

  The lighting circuit 30 has a function of supplying the light source unit 32 with the power supplied from the outside of the lighting fixture L by a power line or the like. When the power supplied from the outside is commercial AC power and the light source unit is an LED light source as described later, the lighting circuit 30 preferably includes an AC / DC converter that converts AC power to DC power. .

  The light source unit 32 includes, for example, a light emitting element such as a light emitting diode (LED). The light source unit 32 lights up when power is supplied from the lighting circuit 30, and turns off when the power is shut off. Further, the lighting circuit 30 can adjust the power supplied to the light source unit 32 according to the drive signal from the control unit 26, thereby adjusting (i.e., dimming) the light intensity of the light source unit 32. .

  The light emitting element constituting the light source unit 32 is not limited to the LED, and may be, for example, an EL element such as a fluorescent lamp, an organic EL (Electro Luminescence) or an inorganic EL, or a semiconductor laser element. Good.

  Next, with reference to FIG. 3, the process performed in the control unit 14 of the controller C will be described. FIG. 3 is a flowchart showing processing executed by the controller at power-on or when the update button is pressed.

  As shown in FIG. 3, the control unit 14 first determines in step S10 whether or not the power is turned on. If a negative determination is made here (NO in step S10), the control unit 14 determines whether or not the update button 13 has been pressed in the subsequent step S12. If a negative determination is made here (NO in step S12), the process is ended (end process) and the operation shifts to the normal operation. In the normal operation in this case, the control signal is transmitted the number of times set initially or the number determined in the previous process.

  When an affirmative determination is made in step S10 or S12, that is, when the controller C is powered on or when the update button is pressed, the control unit 14 proceeds to step S14.

  In step S14, the control unit 14 transmits a response confirmation signal a predetermined number of times to all the lighting devices L1, L2, ..., Ln. This transmission is performed via the wireless unit 18 and the antenna 20 in response to an instruction from the control unit 14. Here, the response confirmation signal is a command signal that causes the lighting device L, which has received the signal, to return a response signal notifying that the response confirmation signal has been received, to the controller C.

  Each of the lighting fixtures L1, L2,..., Ln transmits a response signal to the controller C each time it receives the response confirmation signal. The response signal also includes ID (Identification) information for identifying each of the lighting fixtures L1, L2, ..., Ln. Therefore, the control unit 14 of the controller C can determine which of the lighting fixtures L1, L2,..., Ln is the response signal received by the antenna 20.

  Next, in step S16, the control unit 14 determines the number of times the response signal transmitted from each of the lighting fixtures L1, L2, ..., Ln has been received (hereinafter referred to as "the number of responses") for each lighting fixture. Count and store.

  Then, in the subsequent step S18, the control unit 14 determines the number of control signal transmissions at the normal time based on the number of transmissions of the response confirmation signal and the number of responses of each of the lighting fixtures L1, L2,. . The manner of this determination will be described with reference to FIG.

  FIG. 4 is a table showing the result of the process of FIG. 3 and an equation used to determine the number of control signal transmissions. FIG. 4 shows an example in which a response confirmation signal is transmitted 100 times from the controller C to each of the lighting fixtures L1, L2,. Moreover, in FIG. 4, the case where there are five lighting fixtures (namely, L1, L2, L3, L4, L5) is illustrated.

  As shown in FIG. 4, in this example, the number of responses of the lighting device L1 is 100 times, the number of responses of the lighting device L2 is 83 times, the number of responses of the lighting device L3 is 30 times, and the number of responses of the lighting device L4 is 54 , The number of responses of the lighting fixture L5 is 25 times. In this case, the control unit 14 determines the number N of control signal transmissions at the normal time using the equation shown in FIG. 4.

  More specifically, a value obtained by dividing the number of times of transmission of the response confirmation signal by the minimum number of times of reception in the plurality of lighting fixtures and the safety factor is determined as the number of times of control signal transmission N in normal times. In this case, since the minimum number of responses is 25 times of the lighting fixture L5, the control signal transmission number N is “4” which is a value obtained by dividing the number of transmissions of the response confirmation signal 100 times by 25. It is determined to be a value multiplied by “12”.

  In addition, although the example which is a safety factor "3" was demonstrated in the above, it is not limited to this. The safety factor may be appropriately set to a value in the range of 2 to 5.

  As described above, the lighting control system of the present embodiment includes the wireless unit 18 and the light source unit 32, and the plurality of lighting fixtures in which the operation state of the light source unit 32 is controlled according to the control signal received by the wireless unit 18. It is possible to transmit a control signal and a response confirmation signal to L1, L2, ..., Ln and a plurality of lighting fixtures L1, L2, ..., Ln, and in response to the reception of the response confirmation signal, a plurality of And a controller C capable of receiving response signals respectively transmitted from the lighting fixtures L1, L2, ..., Ln. The controller C transmits a response confirmation signal to all the lighting fixtures L1, L2, ..., Ln a predetermined number of times, and receives the number of receptions of the response signal from each lighting fixture L1, L2, ..., Ln. Each count and store. Then, the controller C determines the control signal transmission number N in the normal state based on the number of transmissions of the response confirmation signal and the number of receptions of the response signal.

  According to this configuration, the number of times of transmission of the response confirmation signal sent from the controller C to all the lighting fixtures L1, L2, ..., Ln and the number of times of reception of the response signals of the lighting fixtures L1, L2, ..., Ln Based on the reliability, the number of reliable transmissions can be reliably determined according to the environment.

  In addition, when the number N of control signal transmissions increases more than necessary, it takes time to complete the transmission, and during that time, there may be a communication failure of another wireless device using the same frequency band. On the other hand, according to the present embodiment, it is possible to shorten the transmission time by reducing the number of times of control signal transmission, so it is possible to suppress communication failures of other wireless devices.

  Further, in the lighting control system of the present embodiment, the controller C is a value obtained by dividing the number of times of transmission of the response confirmation signal by the minimum number of times of reception in the plurality of lighting fixtures L1, L2,. Is preferably determined as the number N of control signal transmissions at normal times. As a result, the number N of control signal transmissions at the normal time can be set to the number of transmissions that can reliably control the operation of each of the lighting devices L1, L2, ..., Ln according to the environment.

  In this case, the safety factor can be a value in the range of 2 to 5. By setting the safety factor in this way, operation control of each lighting fixture can be made more reliable.

  Next, with reference to FIG. 5, another process performed in the control unit 14 of the controller C will be described. FIG. 5 is a flow chart showing the process performed by the controller C prior to transmission of control signals to the lighting fixtures. The process shown in FIG. 5 is executed, for example, in the control unit 14 immediately before transmitting a control signal for lighting, extinguishing, or dimming the lighting fixtures L1, L2,.

  As shown in FIG. 5, first, in step S20, the control unit 14 specifies a lighting fixture to be set as a response. Here, in the processing described above with reference to FIGS. 3 and 4, the control unit 14 identifies the lighting fixture whose response count has been received less than or equal to a predetermined threshold as the response-set lighting fixture. Specifically, in the example shown in FIG. 4, the lighting fixtures L3 and L5 having the number of responses of 30 or less are set for the response. Here, "response setting" refers to setting to perform response confirmation only for a specific lighting fixture among all the lighting fixtures, and a specific light for the response confirmation signal (and / or reception intensity confirmation signal) It can be set by including the ID information of the device.

  As described above, by specifying (that is, narrowing down) a lighting fixture whose response count is equal to or less than a predetermined threshold among all lighting fixtures, the processing load can be reduced by performing adjustment processing of the number of control signal transmissions thereafter. There is an advantage that processing can be completed in a short time.

  Next, in the subsequent step S22, the control unit 14 transmits a response confirmation signal to the lighting devices L3 and L5 set as responses in a number smaller than the previously determined transmission number N. As a specific example, the control unit 14 reduces the number of transmissions N = 12 determined by the processing of FIGS. 3 and 4 at the previous power-on or the time when the update button is pressed. , L5 transmits a response confirmation signal.

  Next, in step S24, the control unit 14 counts and stores the number of responses of each of the lighting fixtures L3 and L5. Then, in the subsequent step S26, the control unit 14 determines whether the number of responses of each of the lighting fixtures L3 and L5 is equal to the number of transmissions N of the response confirmation signal of this time = 11. In other words, it is determined here whether each of the lighting fixtures L3 and L5 has transmitted a response signal in response to all the response confirmation signals. When an affirmative determination is made in step S26 (YES in step S26), the control unit 14 determines the number N of transmissions of the response confirmation signal N = 11 in the subsequent step S30 as the number of control signal transmissions in a normal state, End the process (end process).

  On the other hand, when the determination in step S26 is negative (NO in step S26), the control unit 14 increases the number of transmissions N and transmits the response confirmation signal again in step S28. In this example, the number of times of transmission N is increased once and then 12 times to transmit the response confirmation signal again. Then, the control unit 14 similarly executes steps S24 and S26 described above, and determines whether or not the lighting fixtures L3 and L5 set in response have transmitted response signals in response to all the response confirmation signals. If an affirmative determination is made in step S26, the number of times of signal transmission N is determined to 12 times, and the process is ended. On the other hand, when a negative determination is made in step S26, the response confirmation signal is further incremented once in step S28 to be 13 times, and steps S24 and S26 are repeatedly executed. The number N of times of signal transmission is determined until it can be confirmed that the lighting fixtures L3 and L5 set in this way have transmitted response signals in response to all the response confirmation signals.

  As described above, according to the lighting control system 10 of the present embodiment, the controller C specifies the lighting fixtures L3 and L5 among the plurality of lighting fixtures L1 to L5 that satisfy the predetermined condition as lighting fixtures to be set as a response, and responds The response confirmation signal is transmitted to the set luminaires L3 and L5 the number of times of signal transmission N = 12 times smaller than the previously determined signal transmission number N = 12. Then, the controller C counts and stores the number of times of reception of the response signal from the lighting fixtures L3 and L5 set as the response, and the reception count of the response signal is the response for all lighting fixtures L3 and L5 set as the response. When the number of transmissions of the confirmation signal is equal to the number of transmissions of the confirmation signal, the number of reductions = 11 is determined as the number of transmissions of the control signal N in the normal state.

  On the other hand, when the number of receptions of the response signal is smaller than the number of transmissions of the response confirmation signal N = 11, the controller C increases the number of transmissions of the response confirmation signal N = 11 one time to 12 times, and the response is set. The same processing is performed on all the lighting fixtures until the number of times of reception of the response signal becomes equal to the number of times of transmission of the response confirmation signal.

  As described above, the controller C can set the number N of transmissions suitable for the communication environment at each time by executing the process of adjusting the number N of transmissions of the control signal before transmitting the control signal. More stable operation control is possible.

  In addition, although the example which increases / decreases the frequency | count N of transmission once was demonstrated in the above, it is not limited to this, For example, you may increase / decrease two or more times several times.

  Next, with reference to FIG. 6 and FIG. 7, the illumination control system which is 2nd Embodiment of this indication is demonstrated. In the illumination control system of the second embodiment, a part of the processing content in the control unit 14 of the controller C is different from that of the first embodiment. Therefore, in the following, only the difference will be mainly described, and the same reference numerals will be given to the same components and the description will be omitted.

  FIG. 6 is a flowchart showing processing executed by the controller C at the time of power activation or pressing of the update button in the lighting control system of the second embodiment of the present disclosure. In the process shown in FIG. 6, the process described above with reference to FIG. 3 is the same as steps S10, S12, and S18, and steps S15 and S17 are different.

  As shown in FIG. 6, when the control unit 14 of the controller C makes an affirmative determination in step S10 or S12, in the subsequent step S15, the response confirmation signal for all the lighting fixtures L1, L2,. And transmit the reception strength confirmation signal a predetermined number of times. That is, in the present embodiment, the control unit 14 transmits a reception strength confirmation signal a predetermined number of times in addition to the response confirmation signal. Here, the reception confirmation signal is a command signal that causes the lighting device L that has received the signal to return a signal indicating the reception intensity to the controller C.

  Each of the lighting fixtures L1, L2,..., Ln transmits a response signal and a reception strength signal to the controller C each time the response confirmation signal and the reception strength confirmation signal are received. The response signal and the reception intensity signal also include ID information for identifying each of the lighting fixtures L1, L2, ..., Ln. Therefore, the control unit 14 of the controller C determines which of the lighting fixtures L1, L2, ..., Ln is the signal sent from the response signal and the reception strength signal received by the antenna 20. be able to.

  Next, in the subsequent step S17, the control unit 14 stores the reception intensity transmitted from each of the lighting fixtures L1, L2, ..., Ln. At this time, the control unit 14 updates and stores the minimum reception intensity for each of the lighting fixtures L1, L2, ..., Ln.

  Then, as in the first embodiment, in the subsequent step S18, the control unit 14 determines the number of transmissions of the response confirmation signal and the number of responses of each of the lighting fixtures L1, L2, ..., Ln. Determine the number of control signal transmissions at normal times.

  FIG. 7 is a table showing the result of the process shown in FIG. As shown in FIG. 7, in this example, the number of responses of the lighting device L1 is 100 times, the number of responses of the lighting device L2 is 83 times, the number of responses of the lighting device L3 is 48 times, and the number of responses of the lighting device L4 is 54 , The number of responses of the lighting fixture L5 is 25 times. Moreover, in this example, the minimum reception intensity of the lighting fixtures L1 to L5 is -20 dB, -32 dB, -87 dB, -65 dB, and -93 dB, respectively.

  Here, in the lighting control system of the present embodiment, the minimum reception intensity of each of the lighting fixtures L1 to L5 is used as a predetermined condition for specifying the lighting fixture to which the response setting is made. Specifically, for example, -80 dB is stored in the memory 16 as a predetermined intensity threshold, and the luminaires L3 and L5 having a minimum reception intensity of less than -80 dB are luminaires to which response settings are made. Then, in the illumination control system of the second embodiment, when the process shown in FIG. 5 (that is, the adjustment process before transmission of the control signal) is executed, the minimum reception intensity less than the predetermined intensity threshold as described above in step S20. The luminaires L3 and L5 that were the ones identified are identified as the luminaires to be set. The subsequent processing procedures S22 to S30 are the same as in the first embodiment.

  As described above, in the present embodiment, the controller C transmits the reception strength confirmation signal together with the response confirmation signal, and the reception transmitted from each of the lighting fixtures L1, L2, ..., Ln according to the reception strength confirmation signal. The lowest received intensity of the intensity is stored for each lighting fixture. Then, the predetermined condition to which the lighting fixture is set is that the minimum reception strength is less than the predetermined strength threshold, and the controller C is a lighting fixture whose minimum reception strength is less than the predetermined strength threshold (for example, -80 dB) Is identified as the luminaire to be set.

  As described above, the luminaire with the lowest reception intensity less than the predetermined intensity threshold is specified as the luminaire to be set as the response, and the process of adjusting the number N of control signal transmissions at the normal time is executed before each control signal transmission. This makes it possible to set the number of transmissions N suitable for the communication environment at each time, and enables more stable operation control for each lighting fixture.

  Note that the illumination control system according to the present disclosure is not limited to the above-described embodiment and the modifications thereof, and various modifications and improvements are possible within the scope of the matters described in the claims of the present application. is there.

  For example, as shown in FIG. 2, the controller C may include a timer 21. In this case, the timer measures time, and the processing of steps S14, S16 and S18 in FIG. 3 is executed each time a predetermined time elapses or when a predetermined time comes, and the control signal transmission in a normal time is performed. The number N may be determined.

  DESCRIPTION OF SYMBOLS 10 Lighting control system, 12 operation parts, 13 update buttons, 14, 26 control parts, 16, 28 memories, 18, 24 radio parts, 20, 22 antennas, 21 timers, 30 lighting circuits, 32 light source parts, C controller, L , L1, L2, ..., Ln Lighting fixtures, N Number of times of control signal transmission.

Claims (7)

A plurality of lighting fixtures having a wireless unit and a light source unit, the operating state of the light source unit being controlled according to a control signal received by the wireless unit;
A controller capable of transmitting a control signal and a response confirmation signal to the plurality of lighting devices, and capable of receiving response signals respectively transmitted from the plurality of lighting devices in response to the reception of the response confirmation signal; Equipped with
The controller
The response confirmation signal is transmitted to all the luminaires a predetermined number of times,
Count and store the number of times the response signal from each lighting fixture has been received,
The number of transmissions of the control signal at the normal time is determined based on the number of transmissions of the response confirmation signal and the number of receptions of the response signal.
Lighting control system. The controller
Among the plurality of luminaires, a luminaire satisfying a predetermined condition is specified as a luminaire to be set as a response;
The response confirmation signal is transmitted to the luminaire set as the response, the number of times being smaller than the number of signal transmissions determined previously.
Counting and storing the number of times of reception of the response signal from the luminaire for which the response has been set;
If the number of times of reception of the response signal is equal to the number of times of transmission of the response confirmation signal for all the luminaires set for the response, the number of times reduced is determined as the number of times of transmission of the control signal at the normal time
The lighting control system according to claim 1.   When the number of times of reception of the response signal is smaller than the number of times of transmission of the response confirmation signal, the controller increases the number of times of transmission of the response confirmation signal, and the number of times of reception of response signals for all lighting fixtures for which response is set. The lighting control system according to claim 2, wherein the same processing is performed until the number of transmissions of the response confirmation signal becomes equal.   The lighting control system according to claim 2 or 3, wherein the predetermined condition is that the number of receptions of the response signal is equal to or less than a predetermined number of times threshold. The controller transmits a reception strength confirmation signal together with the response confirmation signal, and stores the minimum reception strength among the reception strengths transmitted from the lighting equipment in response to the reception strength confirmation signal, for each lighting equipment.
The predetermined condition is that the minimum reception strength is less than a predetermined strength threshold, and the controller specifies a lighting fixture whose minimum received strength is less than the predetermined strength threshold as a lighting fixture to which a response is set. The lighting control system according to Item 2.   The controller determines the value obtained by dividing the number of times of transmission of the response confirmation signal by the minimum number of times of reception in the plurality of lighting devices by a safety factor as the number of times of control signal transmission in the normal mode. The lighting control system according to any one of 5.   The lighting control system according to claim 6, wherein the safety factor is a value in the range of 2 to 5.

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