JP2006012679A - Illumination control device of lighting equipment and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination control device capable of controlling illuminance inside a building like a store without depending on characteristics lighting fixtures. <P>SOLUTION: The device is an illuminance controller 10 controlling the lighting fixtures arranged for respective zones 11A to 11C so as to optimize illuminance inside the building with the use of an outdoor illuminance sensor 12D installed outside the building such as a store. The illuminance controller 10 inputs an illuminance detection signal from illuminance sensors 12A to 12C of each zone, and outputs a controlled output value for controlling light of each lighting fixture to respective illuminance sensors 2A to 12C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illuminance control device that performs illuminance control of lighting equipment in a small store, for example.

  Conventionally, for example, a store such as a convenience store has a structure in which four sides are generally surrounded by walls, but in many cases, at least one side is provided with a glass surface as a window side from the viewpoint of crime prevention. Yes. Moreover, a blind is often attached to the window side.

  By the way, in a store, lighting is necessary not only at night but also in the daytime, so the lighting equipment is one of the important equipment. Generally, in a store, it is desirable to perform lighting control so that the illuminance in the store is kept constant. In particular, during the daytime, there is an influence of external light, which is sunlight, from the glass surface, so that the illuminance is uneven on the window side and the wall side. In this case, it is possible to adjust the influence of the outside light on the window side by the blind, but the effect is limited and is easily affected by the outside light.

  In some stores, dimming control that lowers the dimming rate on the window side is introduced when a certain level of brightness is obtained using a daylight sensor. However, unlike the purpose of keeping the inside of the store at a uniform luminance, the purpose is mainly to save power.

As a prior art aiming at power saving of illumination, the proposal which suppresses the electric power of the lighting fixture using a blind and the electric power of an air conditioner is made (for example, refer patent document 1).
Japanese Patent No. 330280

  Recently, especially when setting up a new store, in order to keep the illuminance in the store constant when introducing lighting equipment, the arrangement design of lighting fixtures has been made according to the shape and size of the store. There are many. However, as a characteristic of the lighting fixture, it has been confirmed that the luminance decreases after a certain lighting time has elapsed. Moreover, the characteristic differs for each lighting fixture manufacturer.

  For these reasons, in general, lighting control uses the controllers of each lighting fixture manufacturer, lowers the dimming rate at the time of introduction, and then gradually increases the dimming rate, thereby increasing the illuminance in the store. The control for keeping the constant is executed.

  The objective of this invention is providing the illumination intensity control apparatus which can control the illumination intensity in buildings, such as a store, to the target illumination intensity, without depending on the characteristic of a lighting fixture.

  An aspect of the present invention is an illuminance control device that controls an illuminator so that the illuminance in a building is optimized using an outdoor illuminance sensor installed outdoors in a building such as a store.

  An illuminance control device according to an aspect of the present invention is an illuminance control device that controls illuminance in a building by controlling a plurality of lighting fixtures arranged in a plurality of zones in the building. An outdoor illuminance sensor arranged to detect outdoor illuminance according to natural light, and a control means for controlling the illuminance of each zone to a target illuminance using a detection result from the outdoor illuminance sensor. This is a configuration provided.

  According to the illuminance control device of the present invention, the illuminance of each zone in the building is controlled to the target illuminance in consideration of the influence of outdoor illuminance without depending on the characteristics of the lighting fixtures included in the lighting equipment in the building. This is to provide an illuminance control device that can optimize the illuminance in the building.

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

(Configuration of lighting equipment)
FIG. 1 is a diagram illustrating a configuration of lighting equipment in a store which is a building according to the present embodiment. FIG. 2 is a diagram showing a layout in the store. 3 and 4 are diagrams showing the arrangement of the lighting fixtures 30 in the store. FIG. 5 is a diagram illustrating the arrangement of the illuminance sensors.

  As shown in FIG. 1, the lighting equipment includes an illuminance controller 10, luminaires that are distinguished from each other and described later in zones 11 </ b> A to 11 </ b> C, a plurality of illuminance sensors 12 </ b> A to 12 </ b> C disposed in the store, And an illuminance sensor 12D for outdoor use arranged outdoors.

  Furthermore, the lighting facility includes an in-store lighting breaker 14 connected to the main breaker 13 for controlling the power supply system, converters 15A to 15C arranged for each zone, and an outdoor converter 15D.

  The illuminance controller 10 inputs detection signals from the illuminance sensors 12A to 12D via the control lines 100 and 110, and monitors the current illuminance. Furthermore, the illuminance controller 10 outputs the target illuminance (control output value) to the illuminance sensors 12A to 12C via the control lines 100 and 110. The illuminance sensors 12 </ b> A to 12 </ b> C perform dimming control of the luminaires in each zone through the dimming signal lines 111 </ b> A to 111 </ b> C so that the target illuminance from the illuminance controller 10 is obtained.

(Store exterior composition)
As shown in FIG. 2, the building 200 of the present embodiment is assumed to be a store such as a convenience store, for example. The store has a glass surface 20 on one of the four side surfaces. That is, it is a window glass surface and has a structure in which the inside of the store can be seen from the outside. In particular, in the daytime, the window glass surface 20 is likely to be affected by outside light that is sunlight.

  As lighting equipment in a store, as shown in FIG. 3, a plurality of lighting fixtures 30 are arranged. Here, most of the lighting fixtures 30 are arranged in parallel with the window glass surface 20. Moreover, a part of the lighting fixture 30 is arrange | positioned so that it may orthogonally cross the window glass surface 20 in 1 row or 2 rows.

  Next, as shown in FIG. 4, the inside of the store is divided into three zones: a wall side zone 11A, an intermediate zone 11B, and a window side zone 11C. The some lighting fixture 30 is divided | segmented for every zone 11A-11C. The wall side zone 11A is a zone in which the influence of external light is relatively minimal. The window side zone 11C is a zone in which the influence of external light is relatively maximum. The intermediate zone 11B is a relatively stable lighting environment with little influence from outside light and the case lighting.

  Moreover, about the lighting fixture 30 arrange | positioned at the counter side, it is set as the intermediate | middle zone 11B except the zone which receives especially the influence of external light being the window side zone 11C. Of the lighting fixtures 30 arranged on the walk-in and frozen reach side, the zone that is particularly affected by the external light is the window side zone 11C. Let it be zone 11A.

  Furthermore, as illumination equipment, as shown in FIG. 5, illuminance sensors 12A to 12D for measuring illuminance (or luminance) are arranged. In the store, one illuminance sensor 12A to 12C is arranged for each of the zones 11A to 11C. In addition, each illuminance sensor 12A-12C is in the middle of each lighting fixture 30 in order to control the light control of the lighting fixture 30 of each zone 11A-11C so that it may become the target illumination intensity from the illumination controller 10. Has been placed.

(Operational effect of this embodiment)
Next, the operation and effect of illuminance control according to the present embodiment will be described.

  First, as illustrated in FIG. 6A, in the daytime (daytime), the illuminance of each zone 11 </ b> A to 11 </ b> C in the store 200 is influenced by the outside light from the sunlight 210 during the daytime. FIG. 6B shows the illuminance detected by the illuminance sensors 12A to 12D.

  That is, outdoors, it is confirmed from the detection result of the illuminance sensor 12D that there is an illuminance (brightness) equal to or higher than the illuminance (reference illuminance) required in the store. Moreover, also in the window side zone 11C which is the vicinity of the window glass surface, the illuminance close to the reference illuminance is obtained from the detection result of the illuminance sensor 12C. As for the other zones 11A and 11B, it is confirmed from the detection results of the illuminance sensors 12A and 12B that the influence of external light is relatively small, but is somewhat affected.

  In the present embodiment, the illuminance controller 10 inputs the detection results from the illuminance sensors 12A to 12D and monitors the illuminance of the zones 11A to 11C in the outdoors and in the store.

  Note that, at night shown in FIG. 7A, the illuminance of the zones 11A to 11C in the outdoors and in the store is not affected by external light from the sunlight 210. For this reason, the illuminance detected by the illuminance sensors 12A to 12D is as shown in FIG. 7B. That is, at night, the influence of external light works on the negative side, and the necessary and sufficient illuminance cannot be obtained unless the lighting fixture emits a brightness higher than the required standard.

  Furthermore, as an influence which the lighting in a store receives, there is lighting of a showcase, a signboard, etc. in a store in addition to outside light. In the daytime, as shown in FIG. 8A, in the wall side zone 11A in the store, in particular, the illuminance of the showcase or the signboard in the store indicated by the white portion has a positive effect.

  Thus, in order to obtain the necessary luminance generated from the lighting fixtures in each zone, as shown in FIG. 8B, the illuminance controller 10 performs control corresponding to the window side zone minus the influence of external light. The output value may be output. Moreover, what is necessary is just to output what subtracted the illuminance of external light and a showcase or a signboard in a middle zone and a wall side zone as a control output value. That is, the control output value increases as going from the window side zone to the wall side zone.

  FIG. 9A shows the influence of lighting such as a showcase or a signboard in the store at night. In other words, the influence of external light at night, when the illuminance outside is lost, works on the negative side, and the necessary and sufficient illuminance cannot be obtained unless the luminance exceeds the required standard. As in the daytime, the lighting on the showcase and signboard affects the plus side, so the control output value required to obtain the reference illuminance is from the window side zone to the wall side zone as shown in FIG. The lower it goes.

  As described above, the illuminance controller 10 controls the illuminance obtained by subtracting the illuminance from the illumination of the showcase or the signboard from the reference illuminance as the reference after the illuminance correction, starting from the control output value in the wall side zone 11A. The influence of external light in the wall side zone 11A can be ignored because the influence on the whole is small.

(Specific illuminance control operation)
In the illuminance control as described above, the present embodiment is configured to divide the store into a plurality of zones 11A to 11C and perform the illuminance control. In this case, each of the zones 11A to 11C is not an independent space, and thus is affected by the illumination of the adjacent zone.

  Hereinafter, specific illuminance control in consideration of the influence of illumination in the adjacent zone will be described with reference to FIGS. 10 to 16.

  FIG. 10A is a diagram illustrating the degree of influence of external light, illumination of adjacent zones, and illumination of cases and signs on the window side zone 11C, the intermediate zone 11B, and the wall side zone 11A. FIG. 10B is a diagram showing an influence coefficient (%) per hour in the influence of external light on each zone. FIG. 10C is a diagram showing the influence coefficient (%) from the adjacent zone and the influence of illumination of the case and the signboard in terms of illuminance.

  As is clear from FIG. 10, the external light having high energy luminance decreases from the window side zone to the depth of the wall side zone, but affects all zones. However, in this embodiment, the influence on each zone in the store is only the influence from the adjacent zone. This is because the illuminance reference point is approximately 1000mm in floor height, and the gondola shelf that is often located at the boundary of each zone becomes a wall that is higher than the illuminance reference point, and it is difficult to affect the two zones ahead This is because.

  Since the illumination of the showcase and the signboard is normally arranged in the wall side zone 11A, it is assumed that the wall side zone 11A and its adjacent zone (intermediate zone 11B) are affected.

  As shown in FIG. 10 (B), the influence of outside light on each zone changes from moment to moment, but after broadly divided, it is roughly divided into 3 below the reference illuminance from the sunrise and below the reference illuminance, and below the reference illuminance and below the reference illuminance. A distinction is made between patterns.

  The effect on the adjacent zone of the luminaire is defined to be the number of the entire luminaire, regardless of the time zone, and this fixed value is multiplied by the current illuminance. Showcases and signboard lighting are defined as having a fixed value because the illumination is constant.

  FIG. 11 is a flowchart showing a procedure for the illuminance controller 10 to calculate the influence value of the external light on the adjacent zone.

  The illuminance controller 10 determines that it is sunset when the outdoor illuminance is less than or equal to the defined illuminance (for example, 100 lux) based on the detection result from the outdoor illuminance sensor 12D (YES in steps S1 and S2). Here, the reference illuminance of outside light is set to, for example, 1000 lux (NO in step S2, S5).

  The illuminance controller 10 performs an operation of subtracting the outdoor illuminance from the reference illuminance and subtracting the value obtained by multiplying it by the influence coefficient A of each zone from the reference illuminance (steps S3 and S4). The influence coefficient A is an influence coefficient after 20:00 (sunset) shown in FIG. 10B. For example, the window side zone is -0.5 (-50%), and the intermediate zone is -0.1 (-10%). ), The wall-side zone is -0.05 (-5%).

Here, for example, when the outdoor illuminance is 01 lux (approximately 0) and the reference illuminance is 1000 lux, the calculation result obtained by multiplying the above-described influence coefficient A is:
Window side zone:-((1000-0) * (-0.5)) =-500 lux
Intermediate zone:-((1000-0) * (-0.1)) =-100 lux
Wall side zone:-((1000-0) * (-0.05)) =-50lux
It becomes.

  Next, as shown in the flowcharts of FIGS. 12 to 15, the illuminance controller 10 executes a control operation for setting the illuminance of each zone 11 </ b> A to 11 </ b> C.

  That is, the illuminance controller 10 inputs detection results from the illuminance sensors 12A to 12C and confirms the current illuminance of the zones 11A to 11C. In the illuminance setting of the window side zone 11C, as shown in FIG. 12, the influence from the current illuminance of the intermediate zone 11B as an adjacent zone is calculated (steps S22 and S23). In the illuminance setting of the intermediate zone 11B, as shown in FIG. 14, the influence from the current illuminance of the window side zone 11C and the wall side zone 11A is calculated as an adjacent zone (steps S52 and S53). Further, the influence of lighting of the showcase or the signboard is calculated (step S54). Further, in the illuminance setting of the wall side zone 11A, as shown in FIG. 15, the influence due to the illumination of the intermediate zone 11B and the showcase or signboard is calculated as an adjacent zone (steps S62 and S63).

  As shown in FIG. 13, the illuminance controller 10 determines a target illuminance based on the current illuminance and the reference illuminance in consideration of the influence of outside light, the influence from the adjacent zone, and the influence of the illumination of the showcase or the signboard. (Steps S34, S35, S40). If the target illuminance is greater than or equal to the upper limit, the upper limit is set (steps S37 and S38). On the other hand, if the target illuminance is less than or equal to the lower limit, the lower limit is set (steps S41 and S42).

  The illuminance controller 10 outputs the set target illuminances (control output values) of the zones 11A to 11C to the illuminance sensors 12A to 12C, and executes dimming control of the respective lighting fixtures 30 (step S39). .

  Hereinafter, a specific example of the target illuminance setting for each of the zones 11A to 11C will be described.

  Here, as the current illuminance, for example, the window side zone 11C is 900 lux, the intermediate zone 11B is 1000 lux, and the wall side zone 11A is 1100 lux. Further, for example, +100 lux affects the intermediate zone 11B and +300 lux affects the wall side zone 11A due to illumination of the showcase or the signboard (see FIG. 10C).

  Further, as shown in FIG. 10C, the influence of the illumination in the window side zone on the intermediate zone is 180 lux. The middle zone has an effect of 200 lux on the window side zone and 300 lux on the wall side zone. The wall side zone has an impact of 220 lux on the intermediate zone. The lighting of the showcase and the signboard has an effect of 100 lux on the window side zone and 300 lux on the wall side zone.

  From the above, the illuminance controller 10 calculates that the window side zone is −300 lux, the intermediate zone is 400 lux, and the wall side zone is 550 lux as the influence received from the adjacent zone. Then, the illuminance controller 10 adjusts the lighting fixtures 30 so that the window side zone is 1300 lux, the intermediate zone is 600 lux, and the wall side zone is 450 lux as control output values for controlling the illuminance of each zone. Control the light. Here, for example, when the control lower limit is defined as 800 lux in each zone, the illuminance of the intermediate zone and the wall side zone is controlled to be 800 lux.

  Also, the illuminance controller 10 executes a calculation city that multiplies an influence coefficient for external light in the same manner as described above even when the outdoor illuminance is greater than or equal to the reference illuminance of external light based on the detection result from the outdoor illuminance sensor 12D. (NO in step S6, S9 to S17). However, it is possible to perform control that more reflects the influence of external light by changing the influence coefficient (B, C, D) stepwise depending on how much the outdoor illuminance is higher than the reference illuminance. . When the control output value obtained by the influence coefficient exceeds the upper limit illuminance, the control upper limit value is output.

(Haze control processing)
In the present embodiment, as shown in FIG. 2, a store having a structure in which one surface of a building is a window glass surface 20 is assumed. The window glass surface 20 has a structure in which the inside of the store can be seen from the outside, for the purpose of crime prevention.

  In the present embodiment, as shown in FIG. 11, the illuminance controller 10 executes a haze process, which will be described later, and sets a haze flag to on when the external light is equal to or higher than the sunset illuminance and lower than the reference illuminance ( Step S6 NO, S7, S8).

  The haze phenomenon is a phenomenon in which the inside of a store looks hazy from the outside in a situation where the outside light is unstable. For this reason, the illuminance controller 10 executes a haze process as shown in the flowchart of FIG. 16 to brighten the in-store lighting so that the store from the outside is not visible.

  As shown in FIG. 16, the illuminance controller 10 performs processing for guiding the illuminance of each zone of the wall side zone to the upper limit for the window side zone and the intermediate zone (steps S72, S73, S76, S79). However, depending on the zone, there may be a large difference between the current control output value and the control upper limit value, but if you set the control output value to the upper limit of illuminance at once, the phenomenon of flickering in the store can be seen, so there is a constant Guide to the illuminance upper limit value with the control limit width (α) (steps SS74, S75, S77, S78, S80, S81).

  When the illuminance controller 10 determines the illuminance upper limit value of each zone, the illuminance controller 10 outputs the illuminance sensors 12A to 12C to the dimming control of the respective lighting fixtures 30 (steps S82 and S83). Then, when the illuminance upper limit of each zone is set, the illuminance controller 10 sets the blur flag to 0 ff and returns to the illuminance control routine described above (YES in steps S84 and S85, S86).

  Here, the illuminance controller 10 continues the process until all the zones reach the control upper limit value, but does not execute the control in consideration of the influence of the external light and the adjacent zone during this period (NO in step S85). The illuminance controller 10 also executes a process of gradually reducing the illuminance with a certain control limit width in the case of returning to the control output value for setting the target illuminance after the control is completed.

(Outdoor illumination linked processing)
FIG.17 and FIG.18 is a figure for demonstrating the outdoor illumination intensity interlocking process of this embodiment.

  As described above, the illuminance controller 10 according to the present embodiment executes control in consideration of the influence of adjacent zones when performing illuminance control of each zone in the store. However, it can be envisaged that each zone has a negligible amount of influence from the luminaires in the actual adjacent zone and is almost negligible.

  In such a case, as shown in FIG. 8 (in the case of daytime) and FIG. 9 (in the case of nighttime), the illuminance controller 10 uses the reference after the illuminance correction as a starting point, A control output value obtained by multiplying the difference between the illuminance and the reference illuminance by a constant light reduction rate is output, and the illuminance control of each zone is executed. Further, when it is darker than the reference, similarly, a control output value multiplied by a constant light increase rate is output, and the illuminance control of each zone is executed. FIG. 17 is a diagram illustrating a definition formula that defines the control output value. Here, as the reference illuminance, a value obtained by subtracting the luminance of the illumination of the showcase or the signboard from the required reference illuminance is used.

  As shown in FIG. 18, the illuminance controller 10 determines whether or not the outdoor illuminance satisfies the reference illuminance when setting the illuminance of each zone, and controls the window side zone according to the conditional expression of FIG. A value is obtained (steps S91 to S93).

  That is, when the outdoor illuminance is equal to or higher than the reference illuminance, the setting illuminance of the window side zone is calculated according to the “daytime” conditional expression of FIG. 17 (YES in steps S93, S94 to S100). Here, the illuminance controller 10 does not calculate the target control output value all at once, as in the above-described haze process, and keeps the change within a certain control limit width (α) (steps S99 and S100). Moreover, when it falls below the control illuminance lower limit during the day, the lower limit is set as the control output value.

  On the other hand, when the outdoor illuminance is less than the reference illuminance, the set illuminance of the window side zone is calculated according to the “night” conditional expression of FIG. 17 (NO in steps S93, S104 to S110). Similarly, the illuminance controller 10 does not calculate the target control output value at once, but keeps the change within a certain control limit width (α) (steps S109 and S110). When the control illuminance upper limit is exceeded at night, the upper limit is set as the control output value.

  As described above, when the illuminance controller 10 sets the illuminance of the window side zone, the illuminance controller 10 executes the set illuminance calculation of the adjacent intermediate zone by multiplying the value and the reference illuminance by the dimming rate / luminous rate. The set illuminance calculation of the wall side zone which is the adjacent zone is executed (steps S101 and S102).

  And if the illumination intensity controller 10 determines the illumination intensity of each zone, it will output to each illumination intensity sensor 12A-12C, and will perform the light control of each lighting fixture 30 (step S103).

  In addition, although this embodiment demonstrated lighting control of stores, such as a convenience store, it is applicable also to lighting control of buildings other than a store.

  Further, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure which shows the structure of the lighting installation in the shop regarding the embodiment of this invention, for example. The figure which shows the layout in the shop regarding this embodiment. The figure which shows arrangement | positioning of the lighting fixture in the store regarding this embodiment. The figure which shows arrangement | positioning of the lighting fixture in the store regarding this embodiment. The figure which shows arrangement | positioning of the illumination intensity sensor regarding this embodiment. The figure for demonstrating the influence by the external light in the store regarding this embodiment. The figure for demonstrating the illumination intensity in the night in the shop regarding this embodiment. The figure for demonstrating the influence by the external light in a store regarding this embodiment, and other illumination. The figure for demonstrating the illumination intensity in the night in the shop regarding this embodiment. The figure for demonstrating the illumination intensity control which considered the influence of the adjacent zone regarding this embodiment. The flowchart for demonstrating the illumination intensity control which considered the influence of the adjacent zone regarding this embodiment. The flowchart for demonstrating the illumination intensity control which considered the influence of the adjacent zone regarding this embodiment. The flowchart for demonstrating the illumination intensity control which considered the influence of the adjacent zone regarding this embodiment. The flowchart for demonstrating the illumination intensity control which considered the influence of the adjacent zone regarding this embodiment. The flowchart for demonstrating the illumination intensity control which considered the influence of the adjacent zone regarding this embodiment. The flowchart for demonstrating the illumination intensity control including the haze process regarding this embodiment. The figure for demonstrating the definition formula of the outdoor illumination intensity interlocking process regarding this embodiment. The flowchart which shows the procedure of the outdoor illumination intensity interlocking | linkage process regarding this embodiment.

Explanation of symbols

10 ... Illuminance controller, 11A ... Wall side zone, 11B ... Intermediate zone,
11C ... Window side zone, 12A-12C ... Illuminance sensor, 12D ... Illuminance sensor for outdoor use,
13 ... Main breaker 13, 14 ... Bright breaker in store, 20 ... Window glass surface,
30 ... Lighting equipment.

Claims (10)

In the illuminance control device that controls the illuminance in the building by controlling a plurality of lighting fixtures arranged in a plurality of zones in the building,
An illuminance sensor for outdoor use that is disposed outside the building and detects outdoor illuminance according to natural light;
An illuminance control apparatus comprising: control means for controlling the illuminance of each zone to a target illuminance using a detection result from the outdoor illuminance sensor.   The plurality of zones include a wall side zone in which the influence of the outdoor illuminance is relatively minimum, an intermediate zone in which the influence of the outdoor illuminance is relatively intermediate, and the influence of the outdoor illuminance is relatively maximum. The illuminance control device according to claim 1, further comprising a window side zone. In each zone, each illuminance sensor that detects the illuminance of light emission from each of the lighting fixtures is arranged,
The said control means controls the illumination intensity of each said zone using the detection result from each said illumination sensor together with the detection result from the said outdoor illumination sensor. The illuminance control device according to claim 1. In each zone, each illuminance sensor including a dimming control means for detecting the illuminance of light emitted from each luminaire and controlling the dimming of each luminaire is arranged,
The control means outputs the target illuminance to the dimming control means using the detection results from the illuminance sensors together with the detection results from the outdoor illuminance sensors, so that the illuminance of each zone The illuminance control device according to claim 1, wherein the illuminance control device is controlled.   The said control means controls the illumination intensity of each said zone based on the influence of the illumination intensity from the mutually adjacent zone with respect to each said zone with the influence of the said outdoor illumination intensity. Item 5. The illuminance control device according to any one of items 4 to 5.   The illuminance control apparatus according to claim 2, wherein the control unit adjusts the illuminance in the building to a target illuminance with reference to the illuminance of the wall-side zone.   The said control means controls the illumination intensity of each said zone by adjusting light via the light control signal line with respect to the lighting fixture arrange | positioned in each zone. The illuminance control device according to claim 1.   The control means controls the illuminance of each zone to be forcibly increased in order to suppress a haze state in the building when the outdoor illuminance is less than a certain standard. The illuminance control device according to any one of claims 1 to 7.   The control means executes the illuminance control using the dimming rate when the outdoor illuminance is higher than the reference illuminance, or using the dimming rate when the outdoor illuminance is low. The illuminance control device according to any one of claims 1 to 7. Differentiating the inside of the building into a window side zone, a wall side zone, and an intermediate zone, the first to third illuminance sensors arranged in the respective zones and outdoor illuminance sensors for detecting outdoor illuminance according to natural light In the illuminance control method applied to the illuminance control device that controls the luminaire arranged in each zone using the detection result,
Input each detection result from the first to third illuminance sensors and the outdoor illuminance sensor,
Along with the influence of the outdoor illuminance, the light intensity of each lighting fixture is controlled based on the influence of the illuminance from mutually adjacent zones with respect to the respective zones, thereby controlling the illuminance to a target. Illuminance control method.

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