Patent Publication Number: US-2015084545-A1

Title: Lighting Control System

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priorities from Japanese Patent Application No. 2013-196133, filed on Sep. 20, 2013; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate to a lighting control system. 
     BACKGROUND 
     In recent years, according to the appearance of LED (Light Emitting Diode) lighting and the like, it is possible to realize lighting control finer than that in the past. The development of techniques for comprehensively controlling home electronic appliances such as a smart house is actively performed. 
     For example, concerning a luminaire, there is known a technique for flexibly controlling a plurality of lighting lamps arranged in a predetermined relation and each including a plurality of LEDs. In the technique, a light emitting form of the plurality of LEDs included in one lighting lamp is varied somewhere in the lighting lamp and a mutual relation among the plurality of lighting lamps is determined such that, in portions where the plurality of lighting lamps are connected to one another, the LEDs of different lighting lamps have a common light emitting form to flexibly realize separation of a lit portion and an extinguished portion and division of gradations. 
     However, in a lighting system in the past, a method of controlling gradations taking into account subjective brightness felt by a person in a room is not proposed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram showing an example of a lighting control system according to a first embodiment; 
         FIG. 2  is a diagram showing an example of the configuration of a control device according to the first embodiment; 
         FIG. 3A  is a diagram for explaining a relation between a center area and a peripheral area; 
         FIG. 3B  is a diagram for explaining a relation among the center area, the peripheral area, and a wall area; 
         FIG. 4  is a diagram showing an example of the configuration of information stored in a gradation-control-condition storing unit according to the first embodiment; 
         FIG. 5  is a diagram showing an example of the configuration of information stored in a wall-control-condition storing unit according to the first embodiment; 
         FIG. 6  is a flowchart for explaining an example of a flow of lighting control processing according to the first embodiment; 
         FIG. 7  is a diagram for explaining an example of the configuration of a control device according to a second embodiment; 
         FIG. 8  is a diagram for explaining wall control in the second embodiment; 
         FIG. 9  is a diagram showing an example of the configuration of information stored in a wall-control-condition storing unit according to the second embodiment; 
         FIG. 10  is a flowchart for explaining an example of a flow of lighting control processing according to the second embodiment; 
         FIG. 11  is a diagram showing an example of the configuration of a control device according to a third embodiment; 
         FIG. 12  is a diagram showing an example of the configuration of information stored in a power-consumption storing unit according to the third embodiment; 
         FIG. 13  is a diagram showing an example of the configuration of information stored in a control-pattern storing unit according to the third embodiment; 
         FIG. 14A  is a diagram showing an example of information displayed on an information processing device in a lighting control system according to the third embodiment; 
         FIG. 14B  is a diagram showing another example of information displayed on the information processing device in the lighting control system according to the third embodiment; 
         FIG. 15A  is a diagram for explaining a modification of gradation control; 
         FIG. 15B  is another diagram for explaining the modification; 
         FIG. 15C  is still another diagram for explaining the modification; 
         FIG. 15D  is still another diagram for explaining the modification; 
         FIG. 15E  is still another diagram for explaining the modification; 
         FIG. 15F  is still another diagram for explaining the modification; and 
         FIG. 15G  is still another diagram for explaining the modification. 
     
    
    
     DETAILED DESCRIPTION 
     In general, according to one embodiment, there is provided a lighting control system including: a plurality of luminaires; and a control device. The plurality of luminaires illuminate a predetermined space. The control device executes first control for controlling a dimming degree of the luminaire arranged in a peripheral area in the periphery of a center area among the plurality of luminaires to be darker than the luminaire arranged in the center area and lighting the luminaires in the center area and the peripheral area and second control for controlling a dimming degree, according to predetermined conditions, of the luminaire arranged in a wall area, which is a position for illuminating a wall surface, among the plurality of luminaires to be brighter than during the first control. 
     The lighting control system according to the embodiment may further include a detecting device configured to detect a person in the predetermined space. The control device may determine the positions of the center area and the peripheral area according to the position of the person detected by the detecting device. 
     The control device included in the lighting control system according to the embodiment may execute the second control when the luminaire in the peripheral area is within a predetermined distance from the wall surface or when the luminaire in the peripheral area is the luminaire specified in advance. 
     The control device included in the lighting control system according to the embodiment may, when the second control is executed, light the luminaire in the center area at a dimming degree same as the dimming degree during the first control and light the luminaire in the peripheral area at a dimming degree lower than the dimming degree during the first control. 
     The detecting device included in the lighting control system according to the embodiment may further detect the direction of the person in the predetermined space. The control device may execute the second control for controlling a dimming degree of the luminaire in the wall area present in the forward direction of the person detected by the detecting device among the plurality of luminaires to be brighter than during the first control. 
     The control device included in the lighting control system according to the embodiment may dim the luminaire arranged in the wall area to brightness corresponding to the distance between the person and the wall surface. 
     The lighting control system according to the embodiment may further include: a calculating unit configured to calculate power consumption consumed when control is executed on the basis of a control pattern for executing the first control and the second control; and a display generating unit configured to display the power consumption calculated by the calculating unit and the control pattern in association with each other. 
     In the lighting control system according to the embodiment, the display generating unit may further display a lighting effect realized by the control pattern in association with the control pattern. 
     Embodiments are explained in detail below with reference to the drawings. In the embodiments, components having the same functions are denoted by the same reference numerals and signs, and redundant explanation of the components is omitted. 
     First Embodiment 
     A lighting control system according to a first embodiment includes a plurality of luminaires arranged on, for example, a ceiling surface in a room. Areas in which the luminaires are arranged include a center area where the luminaires are lit brightest when gradation control is executed and a peripheral area located in the periphery of the center area. In the peripheral area, the luminaires are lit at illuminance lower than the illuminance in the center area. In the following explanation, the center area and the peripheral area are collectively referred to as gradation control area as well. 
     Gradation control is lighting control for lighting luminaires, which illuminate a predetermined space, while varying a dimming degree of the luminaires. For example, in the case of lighting in an office, a place where a person is present is detected and then a luminaire that directly illuminates the place where the person is present, for example, a luminaire that illuminates a desk is lit at a dimming degree of 100%. Then, a luminaire in the periphery that does not directly illuminate the desk but illuminates the periphery of the desk is lit at a dimming degree of 60%. In this way, not only the luminaire at least necessary for the person to perform work is lit but also the luminaire in the periphery is lit at the lower dimming degree. Consequently, it is possible to increase brightness felt by the person, reduce loneliness and the like, and improve comfortableness. 
     The lighting control system according to the first embodiment further executes wall control in the gradation control. The wall control is control for, when the luminaires in the peripheral area satisfy predetermined conditions, even if the luminaires in a wall area extending along a wall surface are the luminaires outside the gradation control area, lighting or dimming the luminaires in the wall area to be brighter than during normal gradation control. The wall area indicates an area adjacent to a wall partitioning a space illuminated by the lighting control system or an area extending along the wall. 
     For example, in the wall control, if the distance between the luminaire arranged in the peripheral area and the wall surface is within a predetermined value, the luminaire in the wall area between the peripheral area and the wall surface is lit bright or a dimming degree is controlled to be higher. For example, in the wall control, if the luminaire arranged in the peripheral area is the luminaire designated in advance, the luminaire in the wall area between the peripheral area and the wall surface is lit bright or a dimming degree is controlled to be higher. 
     For example, in the gradation control, it is assumed that the luminaires in the center area are set to be lit at a dimming degree of 100% and the luminaires in the peripheral area are set to be lit at a dimming degree of 60%. Further, it is assumed that, during the gradation control, the luminaires outside the gradation control area are set to be lit at a dimming degree of 30%. In this case, as the wall control, if the peripheral area is present within a predetermined distance, for example, three meters from the wall surface, the dimming degree of the luminaires in the wall area between the peripheral area and the wall surface is increased to 60%. 
     When the gradation control area is present near the wall surface, if the dimming degree of the luminaires present along the wall surface is increased, an amount of illumination light reflected from the wall surface increases. Therefore, brightness felt by the person increases more than brightness obtained by increasing the dimming degree of the luminaires far from the wall surface. The lighting control system according to the first embodiment improves comfortableness of lighting by the gradation control using the reflected light from the wall surface. 
     The lighting control system according to the first embodiment is explained in detail below.  FIG. 1  is a diagram showing an example of the configuration of the lighting control system according to the first embodiment. The example of the configuration of the lighting control system according to the first embodiment is explained with reference to  FIG. 1 . 
     Example of the Configuration of a Lighting Control System  1   
     A lighting control system  1  according to the first embodiment shown in  FIG. 1  includes a control device  10 , luminaires  20 A,  20 B, and  20 C, and sensors  30 A,  30 B, and  30 C. The control device  10  is connected to the luminaires  20 A,  20 B, and  20 C and the sensors  30 A,  30 B, and  30 C via communication line CL. 
     The control device  10  is further connected to a wall switch  40  and an information processing device  50 . 
     The control device  10  controls lighting, extinguishing, a dimming degree, and the like of the luminaires  20 A,  20 B, and  20 C according to control of, for example, ON and OFF of the wall switch  40 . In this embodiment, the control device  10  comprehensively controls the lighting, the extinguishing, the dimming degree, and the like of the luminaires  20 A,  20 B, and  20 C. However, it is also possible that a part of functions of the control device  10  is imparted to the luminaires  20 A,  20 B, and  20 C and the luminaires autonomously perform the control of the lighting, the extinguishing, the dimming degree, and the like. 
     The control device  10  is detachably attachable to the information processing device  50 . A user connects the information processing device  50  to the control device  10  and accesses the control device  10  from the information processing device  50 . The user can execute a setting input and a change of information stored in the control device  10  via the information processing device  50 . 
     The luminaires  20 A,  20 B, and  20 C are lighting lamps that illuminate a predetermined range. The luminaires  20 A,  20 B, and  20 C are not particularly limited as long as the luminaires can change a lighting state and a dimming degree according to a signal received from the control device  10 . For example, an arbitrary luminaire such as an LED, an incandescent lamp, or a fluorescent lamp can be used as the luminaires  20 A,  20 B, and  20 C. When the luminaires  20 A,  20 B, and  20 C autonomously control their states independently from the control device  10 , control units and storing units may be provided in the respective luminaires. 
     The sensors  30 A,  30 B, and  30 C detect a person in a space illuminated by the luminaires  20 A,  20 B, and  20 C. For example, if the luminaires  20 A,  20 B, and  20 C are arranged in an office, the sensors  30 A,  30 B, and  30 C detect a person present in the office and transmit position information of the person to the control device  10 . The sensors  30 A,  30 B, and  30 C are not particularly limited as long as the sensors can detect the presence of a person. For example, an arbitrary detecting device such as an infrared sensor, a human sensor, or an image sensor can be used as the sensors  30 A,  30 B, and  30 C. 
     In  FIG. 1 , the three luminaires  20 A,  20 B, and  20 C and the three sensors  30 A,  30 B, and  30 C are shown. However, the numbers of luminaires and sensors are not particularly limited. An arbitrary number of luminaires can be arranged as long as the luminaires can illuminate the predetermined space and can perform the gradation control and the wall control. An arbitrary number of sensors can be arranged as long as the sensors can detect a person in the predetermined space. 
     The wall switch  40  is a switch used by the user to perform control of lighting, extinguishing, a dimming degree, and the like of the luminaires. The wall switch  40  may be arranged in an arbitrary place as long as the user can easily operate the wall switch  40 . The wall switch  40  is connected to the control device  10  and transmits ON and OFF signals to the control device  10 . 
     It is assumed that necessity of execution of the gradation control is set on the control device  10  side in advance and cannot be instructed from the wall switch  40 . However, even if the necessity of execution of the gradation control is set on the control device  10  side in advance, the setting may be disabled and enabled via a dedicated button for designating the necessity of the gradation control provided in the wall switch  40 . 
     The information processing device  50  is an information terminal such as a general-purpose computer that can be generally acquired. For example, a personal computer (PC), a smart phone, a tablet computer, or the like can be used as the information processing device  50 . The user connects the information processing device  50  to the control device  10  as appropriate and executes a setting input and a change of information. 
     Configuration Example of the Control Device  10   
       FIG. 2  is a diagram showing an example of the configuration of the control device  10  according to the first embodiment. The example of the configuration of the control device  10  is explained with reference to  FIG. 2 . 
     The control device  10  includes a control unit  100 , a storing unit  200 , and a communication unit  300 . The control unit  100  controls processing in the control device  10 . The storing unit  200  stores information used for processing in the control device  10 . The communication unit  300  relays communication between the control device  10  and the luminaires  20 A,  20 B,  20 C, the sensors  30 A,  30 B, and  30 C, the wall switch  40 , the information processing device  50 , and the like. 
     The control unit  100  includes a center-area determining unit  110 , a peripheral-area determining unit  120 , a wall control unit  130 , and a control executing unit  140 . 
     The center-area determining unit  110  determines a center area on the basis of information received from the sensors  30 A,  30 B, and  30 C via the communication unit  300 . For example, it is assumed that the sensor  30 A detects that a person is present under a luminaire specified by a lighting ID (Identifier) “53”. The sensor  30 A transmits information concerning the position of the detected person to the control device  10 . The center-area determining unit  110  determines on the basis of the received information that the person is present under the luminaire specified by the lighting ID “53” and specifies four luminaires including the luminaire with the lighting ID “53” as luminaires in the center area. 
     At this point, specifically, the center-area determining unit  110  acquires, for example, information concerning a coordinate where the person is located and selects the four luminaires centering on a position indicated by the coordinate. The center-area determining unit  110  may be configured to determine a combination of four luminaires selectable as the center area and store the combination in the storing unit  200  in advance such that the combination of luminaires selected as the center area is automatically determined. For example, if a person is detected under a luminaire specified by a lighting ID “66”, luminaires with lighting IDs “66, 67, 76, and 77” are automatically selected as the center area. 
     In this embodiment, as an example, it is assumed that the center area includes four luminaires and the peripheral area includes twelve luminaires around the center area. However, the numbers of luminaires in the center area and the peripheral area may be changed according to a characteristic of a space to which the lighting control system is applied and a form of arrangement of luminaires. 
     The peripheral-area determining unit  120  receives information concerning the luminaires in the center area determined by the center-area determining unit  110  and determines luminaires included in the peripheral area. In this embodiment, the peripheral-area determining unit  120  determines twelve luminaires as the peripheral area. 
     The wall control unit  130  receives information concerning the peripheral area determined by the peripheral-area determining unit  120 , determines whether the wall control is executed and, if the wall control is executed, which luminaire is a target of the wall control and what is content of the wall control and sends information to the control executing unit  140 . 
     The wall control unit  130  includes a wall-control-necessity determining unit  131 , a wall-control-target determining unit  132 , and a wall-control-content determining unit  133 . The wall-control-necessity determining unit  131  determines whether the peripheral area determined by the peripheral-area determining unit  120  is within a predetermined distance from a wall surface. The wall-control-necessity determining unit  131  determines whether a luminaire specified in advance is included in the peripheral area determined by the peripheral-area determining unit  120 . That is, the wall-control-necessity determining unit  131  refers to wall control conditions (explained below) stored in the storing unit  200  in advance and determines whether the determined peripheral area matches the conditions for performing the wall control. 
     When the peripheral area is within the predetermined distance from the wall surface or the luminaire specified in advance is included in the peripheral area, the wall-control-necessity determining unit  131  determines that the wall control is necessary. When the peripheral area is outside the predetermined distance from the wall surface or the luminaire specified in advance is not included in the peripheral area, the wall-control-necessity determining unit  131  determines that the wall control is unnecessary. 
     When the wall-control-necessity determining unit  131  determines that the wall control is unnecessary, the wall-control-necessity determining unit  131  transmits an instruction for not performing the wall control to the control executing unit  140 . In this case, the wall-control-target determining unit  132  and the wall-control-content determining unit  133  do not perform processing. 
     When the wall-control-necessity determining unit  131  determines that the wall control is necessary, subsequently, the wall-control-target determining unit  132  determines a luminaire to be a target of the wall control. That is, the wall-control-target determining unit  132  refers to the wall control conditions (explained below) stored in the storing unit  200  in advance and determines a luminaire to be the wall control target stored in association with the peripheral area. Specifically, the wall-control-target determining unit  132  determines a luminaire arranged along the wall surface between the peripheral area and the wall surface as the wall control target. If the wall control is executed because the luminaire specified in advance is included in the peripheral area, the luminaire is specified in advance as the wall control target and stored in the storing unit  200 . 
     The wall-control-content determining unit  133  specifies content of the wall control referring to the storing unit  200 . For example, the wall-control-content determining unit  133  determines processing content such as processing for increasing a dimming degree of the wall control target luminaire by 10%. 
     The control executing unit  140  receives information concerning the necessity of the wall control, the luminaire to be the wall control target, and the content of the wall control from the wall control unit  130 . The control executing unit  140  executes the wall control with the determined content on the wall control target luminaire. The control executing unit  140  controls the luminaires in the center area and the peripheral area determined by the center-area determining unit  110  and the peripheral-area determining unit  120  on the basis of gradation control conditions (explained below) set in advance. 
     Information Stored in the Storing Unit  200   
     Information stored in the storing unit  200  is explained. The storing unit  200  includes a gradation-control-condition storing unit  210  and a wall-control-condition storing unit  220 . 
     The gradation-control-condition storing unit  210  stores luminaires included in the center area and the peripheral area to be targets if the gradation control is executed and control content, that is, dimming degrees and the like of the luminaires in association with each other. 
     The wall-control-condition storing unit  220  stores, as conditions for executing the wall control, the peripheral area including luminaires within the predetermined distance from the wall surface, a luminaire to be a wall control target corresponding to the peripheral area, and content (a dimming degree, etc.) of the wall control in association with one another. 
     The information stored in the gradation-control-condition storing unit  210  and the wall-control-condition storing unit  220  is further explained with reference to  FIGS. 3A to 5 .  FIG. 3A  is a diagram for explaining a relation between the center area and the peripheral area.  FIG. 3B  is a diagram for explaining a relation among the center area, the peripheral area, and a wall area.  FIG. 4  is a diagram showing an example of the configuration of information stored in the gradation-control-condition storing unit  210  according to the first embodiment.  FIG. 5  is a diagram showing an example of the configuration of information stored in the wall-control-condition storing unit  220  according to the first embodiment. 
     First, as shown in  FIG. 3A , it is assumed that forty-nine luminaires in total (7×7) are arranged on a ceiling surface. For example, in this embodiment, it is assumed that luminaires indicated by four black squares are specified as the center area. Then, if the gradation control is performed, twelve luminaires indicated by hatching located around the four luminaires are the peripheral area. 
     IDs are respectively given to the forty-nine luminaires as peculiar addresses. In an example shown in  FIG. 3A , lighting IDs “11” to “17” are respectively given to a luminaire in the first row and the first column to a luminaire in the first row and the seventh column. Lighting IDs “21” to “27” are respectively given to a luminaire in the second row and the first column to a luminaire in the second row and the seventh column (see  FIG. 3B ). The IDs of the luminaires are stored in the storing unit  200  (not shown in the figure). 
     An example in which the wall control is applied to the luminaires arranged as explained above is shown in  FIG. 3B . In the example shown in  FIG. 3B , luminaires specified by lighting IDs “34, 35, 44, and 45” are located in the center area. Luminaires specified by the lighting IDs “23, 24, 25, 26, 33, 36, 43, 46, 53, 54, 55, and 56” are located in the peripheral area. In this case, it is assumed that the wall control is performed if the peripheral area is located within a distance a from the wall surface. Then, the luminaires specified by the lighting IDs “23, 24, 25, 26, 36, 46, and 56” are located within the distance a from the wall surface. Therefore, the wall control is applied to the luminaires specified by the lighting IDs “23, 24, 25, 26, 36, 46, and 56”. In this example, lighting IDs of luminaires arranged along the wall surface between the peripheral area and the wall surface are “13, 14, 15, 16, 17, 27, 37, 47, and 57”. Therefore, the wall control for increasing a dimming degree of the luminaires specified by the lighting IDs “13, 14, 15, 16, 17, 27, 37, 47, and 57” is performed. In the example shown in  FIG. 3B , the control is performed to reduce a dimming degree of the luminaires in the peripheral area and increase a dimming degree of the luminaires arranged along the wall surface. In the wall control, when the dimming degree of the luminaires on the wall surface is increased compared with a dimming degree during the normal gradation control, the control for reducing the dimming degree of the luminaires in the peripheral area in this way may be simultaneously performed. 
     In order to execute the gradation control and the wall control explained above, gradation control conditions and wall control conditions that specify conditions for performing the controls are stored in the storing unit  200  in advance. 
     The gradation-control-condition storing unit  210  stores, for example, gradation control conditions shown in  FIG. 4 . As shown in  FIG. 4 , the gradation-control-condition storing unit  210  stores the center area and the peripheral area to be targets of the gradation control and dimming degrees applied to the center area and the peripheral area in association with condition IDs. For example, the gradation control condition with a condition ID “01” is applied if the center area includes the luminaires specified by the lighting IDs “34, 35, 44, and 45”. In this case, the peripheral area includes the luminaires specified by the lighting IDs “23, 24, 25, 26, 33, 36, 43, 46, 53, 54, 55, and 56”. The luminaires in the center area are controlled to a dimming degree of 90% and the luminaires in the peripheral area are controlled to a dimming degree of 50%. 
     The wall-control-condition storing unit  220  stores, for example, wall control conditions shown in  FIG. 5 . As shown in  FIG. 5 , the wall-control-condition storing unit  220  stores lighting IDs of the luminaires included in the peripheral area (peripheral area luminaire IDs), lighting IDs of the luminaires to be targets of the wall control (wall area luminaire IDs), and control content in association with condition IDs. For example, a wall control condition with a condition ID “01” is applied if the peripheral area luminaire IDs are “23, 24, 25, 26, 33, 36, 43, 46, 53, 54, 55, and 56”. In this case, the lighting IDs “13, 14, 15, 16, 17, 27, 37, 47, and 57” are specified as the wall area luminaire IDs. “Dimming degree 10% UP” is specified as the content of the wall control. 
     The wall-control-condition storing unit  220  stores the peripheral area luminaire IDs “35, 45, and 55”, the wall area luminaire IDs “37, 47, and 57”, and control content “dimming degree 20% UP” in association with a condition ID “03”. That is, if the luminaires specified by the lighting IDs “35, 45, and 55” are included in the luminaires determined as the peripheral area, the wall control for increasing a dimming degree of the luminaires specified by the lighting IDs “37, 47, and 57” by 20% is performed. Such conditioning is suitable for, for example, if a desk or the like is arranged under the luminaires specified by the lighting IDs “35, 45, and 55” and it is known that, when a person takes a seat, the person turns to the direction of the luminaires specified by the lighting IDs “37, 47, and 57”. 
     Flow of Lighting Control Processing in the First Embodiment 
       FIG. 6  is a flowchart for explaining an example of a flow of lighting control processing according to the first embodiment. As shown in  FIG. 6 , when the wall switch  40  is turned on, first, the control device  10  starts normal control not including the gradation control (S 601 ). That is, the luminaires are lit at a dimming degree set in default. Subsequently, the sensors  30 A,  30 B, and  30 C detect a person (S 602 ). Information concerning the detected person is transmitted to the control device  10 . In the control device  10 , the center-area determining unit  110  and the peripheral-area determining unit  120  determine the center area and the peripheral area on the basis of the received information concerning the person (S 603 ). The wall control unit  130  determines necessity of the wall control on the basis of information concerning the determined peripheral area (S 604 ). If the wall control unit  130  determines that the wall control is not performed (No in S 605 ), the wall control unit  130  transmits an indication to that effect to the control executing unit  140 . The control executing unit  140  refers to the information stored in the storing unit  200  and executes the gradation control not including the wall control (S 608 ). 
     On the other hand, if the wall control unit  130  determines that the wall control is performed (Yes in S 605 ), the wall control unit  130  subsequently refers to the storing unit  200  and determines a target and control content of the wall control (S 606 ). The wall control unit  130  executes the gradation control including the wall control with the determined content on the determined target (S 607 ). 
     If control for, for example, changing a dimming degree and a lighting color of the luminaires in the peripheral area and the center area is performed as a part of the wall control explained above, the wall control unit  130  also stores control content applied to the peripheral area and the center area in the wall-control-condition storing unit  220  and executes lighting control on the basis of the stored content. 
     For example, as a part of the wall control, it is possible to perform lighting control for, for example, not lighting the luminaires in the peripheral area or lighting the luminaires at a dimming degree lower than a dimming degree during the normal gradation control. Consequently, it is possible to improve brightness felt by the user without substantially increasing power consumption compared with the normal gradation control. 
     Effects of the First Embodiment 
     As explained above, the lighting control system  1  according to the first embodiment includes the plurality of luminaires  20 A,  20 B, and  20 C and the control device  10 . The plurality of luminaires  20 A,  20 B, and  20 C illuminate a predetermined space. The control device  10  executes first control (normal gradation control) for dimming the luminaire arranged in the peripheral area in the periphery of the center area among the plurality of luminaires to be darker than the luminaire arranged in the center area and lighting the luminaires in the center area and the peripheral area. The control device  10  executes second control (the wall control) for controlling the dimming degree, according to predetermined conditions, of the luminaire arranged in the wall area, which is the position for illuminating the wall surface, among the plurality of luminaires to be brighter than during the first control. Therefore, in the first control (the normal gradation control), if brightness felt by a person in a room is insufficient because the brightness of the wall surface is insufficient, luminaires for illuminating the wall surface may be added and lit. Therefore, it is possible to increase the brightness felt by the person and improve comfortableness of lighting. 
     The lighting control system  1  according to the first embodiment further includes the detecting devices  30 A,  30 B, and  30 C that detect a person in a predetermined space. The control device  10  determines the positions of the center area and the peripheral area according to the position of the person detected by the detecting devices  30 A,  30 B, and  30 C. Therefore, it is possible to execute the gradation control according to the position of the person present in the room. 
     In the lighting control system  1  according to the first embodiment, the control device  10  executes the second control (the wall control) if a luminaire in the peripheral area is present within a predetermined distance from the wall surface or the luminaire in the peripheral area is a luminaire specified in advance. Therefore, it is possible to realize lighting control effectively using reflected light from the wall surface to, for example, reduce a dimming degree of the luminaire in the peripheral area and light the luminaire in the wall area if the peripheral area is close to the wall surface. It is possible to set the wall control to be executed even if the peripheral area is not within the predetermined distance from the wall surface. 
     In the lighting control system  1  according to the first embodiment, if the second control (the wall control) is executed, the control device  10  can light the luminaire in the center area at a dimming degree same as the dimming degree during the first control (the normal gradation control) and light the luminaire in the peripheral area at a dimming degree lower than the dimming degree during the first control. Therefore, it is possible to increase the brightness felt by the person using the reflected light from the wall surface and improve comfortableness of lighting without substantially increasing power consumption compared with power consumption during the normal gradation control. 
     Second Embodiment 
     The lighting control system according to the first embodiment executes the wall control according to the distance of the peripheral area from the wall and whether the designated luminaire is included in the peripheral area. A lighting control system according to a second embodiment not only detects the position of a person with a sensor but also detects a direction the person is facing and determines a luminaire to be a target of wall control according to the detected direction. 
     Configuration of a Lighting Control System  2  According to the Second Embodiment 
     The configuration of the lighting control system  2  according to the second embodiment is the same as the configuration of the lighting control system  1  according to the first embodiment shown in  FIG. 1 . The second embodiment is different from the first embodiment in that the sensors  30 A,  30 B, and  30 C detect not only the presence of a person but also the direction of the person and transmit the presence and the direction of the person to a control device  10 A. The control device  10 A executes the wall control to light or to control the dimming degree of a luminaire that illuminates a wall surface in the forward direction of the person detected by the sensors. Differences from the first embodiment are mainly explained below. Explanation concerning the same functions and the same components is omitted. 
     Example of the Configuration of the Control Device  10 A 
       FIG. 7  is a diagram showing an example of the configuration of the control device  10 A according to the second embodiment. An example of the configuration of the control device  10 A is explained with reference to  FIG. 7 . 
     As shown in  FIG. 7 , the control device  10 A includes a control unit  400 , a storing unit  500 , and a communication unit  600 . The control unit  400  controls processing in the control device  10 A. The storing unit  500  stores information used for the processing in the control device  10 A. The communication unit  600  relays communication between the control device  10 A and the luminaires  20 A,  20 B, and  20 C, the sensors  30 A,  30 B, and  30 C, the wall switch  40 , the information processing device  50 , and the like. 
     The control unit  400  includes a wall control unit  410  and a gradation control unit  420 . 
     The wall control unit  410  executes processing concerning the wall control. The wall control in the second embodiment refers to control of dimming degree of a luminaire, which illuminates a predetermined range of a wall present in the front in a visual line direction of a person, to be brighter than during the normal gradation control. The wall in the front in the visual line direction is illuminated in this way to increase brightness felt by the person and improve comfortableness of lighting. 
     The wall control unit  410  includes a position specifying unit  411 , a direction specifying unit  412 , a distance specifying unit  413 , a control-content determining unit  414 , and a wall-control executing unit  415 . 
     The position specifying unit  411  receives information concerning a person detected by the sensors  30 A,  30 B, and  30 C via the communication unit  600  and specifies the position of the person. 
     The direction specifying unit  412  receives the information concerning the person detected by the sensors  30 A,  30 B, and  30 C via the communication unit  600  and specifies the front in a visual line direction of the person. 
     The distance specifying unit  413  specifies the distance between the person and a wall surface in the front in the visual line direction on the basis of the position and the front in the visual line direction specified by the position specifying unit  411  and the direction specifying unit  412 . 
     The control-content determining unit  414  determines content of the wall control on the basis of the position specified by the position specifying unit  411 , the front in the visual line direction specified by the direction specifying unit  412 , and the distance specified by the, distance specifying unit  413 . Specifically, the control-content determining unit  414  refers to wall control conditions stored in a wall-control-condition storing unit  510  in advance and determines control content. 
     The wall-control executing unit  415  executes control of a luminaire to be a target of the wall control on the basis of the control content determined by the control-content determining unit  414 . 
     The gradation control unit  420  executes gradation control. The gradation control in the second embodiment is the same as the gradation control in the first embodiment. The gradation control unit  420  executes processing same as the processing by the center-area determining unit  110 , the peripheral-area determining unit  120 , and the control executing unit  140  shown in  FIG. 2 . Specifically, the gradation control unit  420  determines a center area and a peripheral area on the basis of information received from the sensors  30 A,  30 B, and  30 C and executes the gradation control on the basis of information stored in a gradation-control-condition storing unit  520 . 
     Example of Information Stored in the Storing Unit  500   
     An example of information stored in the storing unit  500  is explained with reference to  FIGS. 8 and 9 .  FIG. 8  is a diagram for explaining the wall control in the second embodiment.  FIG. 9  is a diagram showing an example of the configuration of information stored in the wall-control-condition storing unit  510  according to the second embodiment. 
     First, the wall control in the second embodiment is further explained with reference to  FIG. 8 .  FIG. 8  shows thirty-five luminaires arranged on a ceiling. Lighting IDs “01” to “35” are allocated to the luminaires. 
     In an example shown in  FIG. 8 , a person is detected in the center of luminaires specified by lighting IDs “21, 22, 27, and 28”. The front in the visual line direction is the upward direction of  FIG. 8 . For example, if the normal gradation control in the first embodiment is executed, the luminaires specified by the lighting IDs “21, 22, 27, and 28” are the center area and luminaires specified by lighting IDs “14, 15, 16, 17, 20, 23, 26, 29, 31, 32, 33, and 34” are the peripheral area. In gradation control for lighting only the center area and the peripheral area, the other luminaires are not lit. 
     If luminaires that illuminate the wall in the front in the visual line direction (luminaires specified by the lighting IDs “03 and 04”) are lit, brightness in the visual field of the person increases and comfortableness by lighting is improved. Therefore, in the second embodiment, the luminaires specified by the lighting IDs “03 and 04” are also lit to increase the brightness felt by the person. Control for lighting the luminaires that illuminate the wall surface located in the front in the visual line direction of the person or increasing a dimming degree of the luminaires is the wall control in the second embodiment. 
     The storing unit  500  includes the wall-control-condition storing unit  510  and the gradation-control-condition storing unit  520 . The gradation-control-condition storing unit  520  is the same as the gradation-control-condition storing unit  210  in the first embodiment and stores information same as the information shown in  FIG. 4 . 
     The wall-control-condition storing unit  510  stores conditions of the wall control according to the second embodiment and stores, for example, information shown in  FIG. 9 . In an example shown in  FIG. 9 , a position of a person (“position”), a visual line direction of the person (“direction”), and a distance between the person and a wall surface (“distance”) are stored in association with a condition ID. Further, a lighting ID of a luminaire to be a control target (“control target”) and a dimming degree attained by the luminaire in the wall control (“dimming degree”) are stored in association with the condition ID. 
     For example, in  FIG. 9 , control conditions that the position of the detected person is “(3, 2)”, the direction is “0°”, and the distance is “4 m” are stored in association with a condition ID “01”. In this example, the position of the person is represented by a coordinate (x, y) shown in  FIG. 8 . That is, the position of the person shown in  FIG. 8  is a coordinate (3, 2). In the example shown in  FIG. 9 , the visual line direction of the person is represented by a clockwise angle with 0° set in the upward direction in  FIG. 8 . The visual line direction of the person in  FIG. 8  is “0°”. In the example shown in  FIG. 9 , assuming that a space allocated to each of the luminaires shown in  FIG. 8  is about 1 m×1 m, the distance from the person to the wall surface is represented. The distance between the person and the wall surface in the front in the visual line direction in  FIG. 8  is “4 m”. 
     That is, the condition ID “01” shown in  FIG. 9  specifies a wall control condition applied when the person in the position and the visual line direction shown in  FIG. 8  is detected. As shown in  FIG. 9 , the condition ID “01” is further associated with control targets “03 and 04” and a dimming degree “50%”. That is,  FIG. 8  indicates that the luminaires specified by the lighting IDs “03 and 04” are lit at the dimming degree of 50%. 
     Control conditions with a condition ID “02” are conditions that the person is present in (3, 5), that is, among luminaires specified by lighting IDs “03, 04, 09, and 10” and looks at the direction “0°”, that is, the upward direction. In this case, the distance between the person and the wall surface in the front in the visual line direction is 1 m. If the distance between the person and the wall in the front of the visual line direction is small, a sense of the person feeling bright even if the brightness of the wall is low is considered to be the same as a sense felt by the person if the brightness of the wall is high and the distance to the wall is large. Therefore, the luminaires that illuminate the wall surface are lit with a dimming degree reduced compared with a dimming degree set if the distance to the wall surface is large. That is, the luminaires specified by the lighting IDs “03 and 04” are lit at a dimming degree of 30%. 
     The dimming degree of the luminaires that illuminate the wall surface is adjusted according to the distance between the person and the wall surface as explained above. Consequently, it is possible to maintain brightness felt by the person at a desired level irrespective of the distance between the person and the wall surface. 
     The user can set control conditions as appropriate according to the arrangement of office supplies, partitions, machines, and the like arranged in a room. 
     Flow of Lighting Control Processing According to the Second Embodiment 
       FIG. 10  is a flowchart for explaining an example of a flow of lighting control processing according to the second embodiment. The example of the flow of the lighting control processing according to the second embodiment is explained with reference to  FIG. 10 . 
     First, when a person turns on the wall switch  40 , normal control set in advance is started (S 1001 ). The sensors  30 A,  30 B, and  30 C detect the person (S 1002 ). A detection result of the sensors  30 A,  30 B, and  30 C is transmitted to the control device  10 A. In the control device  10 A, the position specifying unit  411 , the direction specifying unit  412 , and the distance specifying unit  413  specify the position of the person, the front in the visual direction of the person, and the distance between the person and the wall surface in the front of the visual line direction on the basis of the received information (S 1003 ). The control-content determining unit  414  determines control content referring to the wall-control-condition storing unit  510  on the basis of the specified position, direction, and distance (S 1004 ). The wall-control executing unit  415  executes the wall control on the basis of the determined control content (S 1005 ). Thereafter, the processing returns to S 1002 . 
     Effects of the Second Embodiment 
     As explained above, in the lighting control system  2  according to the second embodiment, the detecting devices (the sensors  30 A,  30 B, and  30 C) further detect the direction of the person in the predetermined space. The control device  10 A executes the second control (the wall control) for controlling the dimming degree of the luminaire in the wall area in the front direction of the person detected by the detecting devices to be brighter than during the first control among the plurality of luminaries (during the normal gradation control). Therefore, the dimming degree of the luminaire is controlled such that the area in the visual field of the person is brightened. Thus, the brightness felt by the person can be increased. Consequently, it is possible to improve comfortableness given to the person by lighting. 
     In the lighting control system  2  according to the second embodiment, the control device  10 A controls the dimming degree of the luminaire present in the wall area to brightness corresponding to the distance between the person and the wall surface. Therefore, it is possible to control the brightness of the wall surface to be high if the person is far from the wall surface and control the brightness of the wall surface to be low if the person is near the wall surface and prevent unnecessary power consumption while maintaining brightness felt by the person. 
     Third Embodiment 
     In the first and second embodiments, when the gradation control is executed, the luminaire that does not directly illuminate a place where the person is present is also lit and its dimming degree is controlled according to the wall control to improve comfortableness of lighting. The gradation control is control for setting dimming degrees of not only the luminaire in a portion where the person is present but also the luminaire around the portion to be low and lighting the luminaires. Therefore, power consumption tends to be larger than power consumption in the normal control (the control not involving the gradation control). If the wall control is also executed in the gradation control, it is likely that power consumption increases more than power consumption in the normal gradation control. In both cases, it is difficult for the user to grasp the power consumption. Therefore, in a third embodiment, a lighting control system is configured to estimate power consumption with a simulation according to a form of lighting control and to be capable of presenting the power consumption to a user together with an index of comfortableness, a lighting effect, and the like by the lighting control. 
     Configuration of a Lighting Control System  3  According to the Third Embodiment 
     The configuration of the lighting control system  3  according to the third embodiment is the same as the configuration of the lighting control system  1  according to the first embodiment shown in  FIG. 1 . The third embodiment is different from the first and second embodiments in that a control device  10 B calculates power consumption according to a plurality of control patterns and transmits the power consumption in a format that can be displayed on a display unit of the information processing device  50 . In the following explanation, differences from the first and second embodiments are mainly explained. Explanation concerning the same functions and the same components is omitted. 
     Example of the Configuration of the Control Device  10 B 
       FIG. 11  is a diagram showing an example of the configuration of the control device  10 B according to the third embodiment. The example of the configuration of the control device  10 B is explained with reference to  FIG. 11 . 
     As shown in  FIG. 11 , the control device  10 B includes a control unit  700 , a storing unit  800 , and a communication unit  900 . The control unit  700  controls processing in the control device  10 B. The storing unit  800  stores information used for processing in the control device  10 B. The communication unit  900  relays communication between the control device  10 B and the luminaires  20 A,  20 B, and  20 C, the sensors  30 A,  30 B, and  30 C, the wall switch  40 , the information processing device  50 , and the like. 
     The control unit  700  includes a simulation unit  710 , a gradation control unit  720 , and a wall control unit  730 . The simulation unit  710  calculates power consumption with simulations corresponding to a plurality of control patterns and generates information for presenting the control patterns and the power consumption on a display screen of the information processing device  50  in association with each other. 
     The gradation control unit  720  and the wall control unit  730  execute functions and processing same as the functions and the processing of the gradation control unit  420  and the wall control unit  410  according to the second embodiment. 
     The simulation unit  710  includes a control-pattern generating and receiving unit  711 , a power-consumption calculating unit  712 , and a display generating unit  713 . 
     The control-pattern generating and receiving unit  711  receives a control pattern input by a user from the information processing device  50  and stores the control pattern in the storing unit  800 . When control conditions are stored in the storing unit  800  in advance, the control-pattern generating and receiving unit  711  may generate a control pattern corresponding to the control conditions and store the control pattern in the storing unit  800 . For example, when a functional unit equivalent to the gradation-control-condition storing unit  520  in the second embodiment is present in the storing unit  800 , the control-pattern generating and receiving unit  711  may generate a control pattern corresponding to the stored control content and store the control pattern in the storing unit  800 . 
     The power-consumption calculating unit  712  simulates and calculates power consumption consumed when the control pattern stored in the storing unit  800  by the control-pattern generating and receiving unit  711  is executed. For example, information concerning electric power per unit time consumed by the luminaires is stored in the storing unit  800  in advance. The power-consumption calculating unit  712  calculates power consumption of control patterns on the basis of information concerning the luminaires used in the control patterns and the information concerning the electric power. 
     The display generating unit  713  generates information for presenting a plurality of control patterns and power consumption of the control patterns to the information processing device  50  in association with each other. In this case, the display generating unit  713  is enabled to present the control patterns and the power consumption together with, for example, an arrangement diagram of the luminaires such that the user can easily recognize the control patterns. The display generating unit  713  may also display lighting effects attained by the control patterns. For example, the display generating unit  713  may display control patterns such as “relaxation”, “wakening”, and “concentration” and lighting effects of the control patterns in association with each other such that the control patterns and the lighting effects can be confirmed. The display generating unit  713  may display, for example, an index representing comfortableness of lighting. 
     The storing unit  800  includes a power-consumption storing unit  810  and a control-pattern storing unit  820 . 
     The power-consumption storing unit  810  stores lighting IDs of luminaires and power consumption per unit time of the luminaires in association with each other. Here, it is assumed that the power consumption of the luminaires during the dimming control can be estimated by simply multiplying the power consumption per unit time with a dimming degree (%). 
       FIG. 12  is a diagram showing an example of the configuration of information stored in the power-consumption storing unit  810  according to the third embodiment. As shown in  FIG. 12 , for example, power consumption “100 W/h” of a luminaire is stored in association with a lighting ID “01” for specifying the luminaire. 
     The control-pattern storing unit  820  stores a control pattern of a luminaire. For example, the control-pattern storing unit  820  stores a lighting ID and a dimming degree of the luminaire lit by the control pattern in association with a pattern ID. In the case of a control pattern for realizing the gradation control and the wall control, flags indicating the gradation control and the wall control may be added. 
       FIG. 13  is a diagram showing an example of the configuration of information stored in the control-pattern storing unit  820  according to the third embodiment. As shown in  FIG. 13 , for example, a lighting ID “01-05” for specifying a luminaire to be lit and a dimming degree “100%” of the luminaire are stored in association with a pattern ID “P01”. The gradation control flag and the wall control flag are “ON” in association with the pattern ID “P01” to indicate that a control pattern with the pattern ID “P01” is a pattern for performing the gradation control and the wall control. 
     If the control pattern with the pattern ID “P01” is associated with the first embodiment, the control pattern with the pattern ID “P01” is considered to be a luminaire, the center area of which is “01-05”, the peripheral area of which is “08-20”, and the wall area of which is “30-35”. The pattern ID “P01” is considered to be a pattern for setting a dimming degree of a luminaire in the peripheral area lower than a dimming degree during the normal gradation control and lighting a luminaire in the wall area at a dimming degree higher than a dimming degree in the peripheral area. 
     Example of Information Presented to the Information Processing Device  50   
       FIG. 14A  is a diagram showing an example of information displayed on the information processing device  50  in the lighting control system  3  according to the third embodiment.  FIG. 14B  is a diagram showing an example of information displayed on the information processing device  50  in the lighting control system  3  according to the third embodiment. 
     In  FIGS. 14A and 14B , as an example, the information processing device  50  is a smart phone. A user connects the information processing device  50  to the control device  10 B. A control pattern selection screen may be automatically displayed according to the connection. The user may access a portal site or the like designated in advance and perform setting on the smart phone. 
     As shown in  FIG. 14A , a list of selectable control patterns is displayed on a display screen of the information processing device  50 . In the example shown in  FIG. 14A , the lighting control system  3  does not particularly display whether the control patterns are the gradation control or the normal control (the control not involving the gradation control) and whether the control patterns involve the wall control. However, the display screen is not limited to this. A screen may be configured to display whether the control patterns are the gradation control. 
     Even if specific control content is not displayed on the screen shown in  FIG. 14A , the user can recognize the arrangement and control content of luminaires by selecting a “layout” button. For example, if the user selects the “layout” button of “relaxation” on the screen shown in  FIG. 14A , the screen transitions to the screen shown in  FIG. 14B . The screen shown in  FIG. 14B  displays the arrangement of control target luminaires in the control pattern of “relaxation” and control content, i.e., dimming degrees of the luminaires. 
     In the display screen shown in  FIG. 14B , twenty-five squares shown in a rectangle indicate luminaires. Dimming degrees of the luminaires are indicated by patterns or the like. In  FIG. 14B , it is seen that the luminaire in the center is lit at a dimming degree of 50% and the luminaires around the luminaire in the center are lit at a dimming degree of 30%. Besides, if lighting colors are also controlled, the lighting colors may be displayed. If applied control patterns are different according to periods of time, applied periods of time or the like may be also displayed. 
     As explained above, the user can check a control pattern and power consumption looking at the screen shown in  FIG. 14A  and check more detailed arrangement and control content of the luminaires looking at the screen shown in  FIG. 14B . Therefore, the user can input a new control pattern, cause the control device  10 B to simulate power consumption of the control pattern, and compare the control pattern with other control patterns. The user can also select a desired control pattern after easily checking and comparing power consumption of a plurality of applicable control patterns already stored in the control device  10 B. 
     In the third embodiment, a function of simulating power consumption of a control pattern is included in the control device  10 B. However, for example, a simulation program for calculating power consumption of a control pattern may be separately distributed to enable information processing devices to execute a simulation. 
     Effects of the Third Embodiment 
     As explained above, the lighting control system  3  according to the third embodiment further includes the calculating unit (the power-consumption calculating unit  712 ) configured to calculate power consumption consumed when control is executed on the basis of control patterns for executing the first control (the normal gradation control) and the second control (the wall control) and the display generating unit  713  configured to display the power consumption calculated by the calculating unit and the control pattern in association with each other. Therefore, the lighting control system  3  can present power consumption consumed when control patterns are respectively executed to the user to enable the user to easily check the power consumption. Therefore, even if control in which power consumption tends to be high such as the gradation control is performed, the user can select a preferable control pattern after checking the power consumption. Therefore, the lighting control system  3  can contribute to a reduction in power consumption. 
     In the lighting control system  3  according to the third embodiment, the display generating unit  713  can further display a lighting effect realized by a control pattern in association with the control pattern. Since the lighting effect attained by the control pattern is also displayed on the display screen in this way, the user can easily grasp lighting effects of respective control patterns and easily select a control form preferable for the user. 
     Modification 
     When the gradation control is executed according to the embodiments as explained above, the control can also be executed by changing a dimming degree stepwise. The stepwise gradation control is explained below with reference to  FIGS. 15A to 15G .  FIGS. 15A to 15G  are diagrams for explaining a modification of the gradation control. 
     When the gradation control is performed, usually, a dimming degree of the center area is set high and a dimming degree of the peripheral area is set low. In this modification, first, upper limit values and lower limit values of dimming degrees are set for the respective areas. The center area is lit at a rather low dimming degree ( FIG. 15A , a center area lower limit value). The dimming degree of the center area is increased stepwise. If the dimming degree of the center area reaches the upper limit value ( FIG. 15B , a center area upper limit value), subsequently, a peripheral area  1  located right on the outer side of the center area is lit at a dimming degree lower than the dimming degree of the center area ( FIG. 15C , a center area upper limit value and a peripheral area  1  lower limit value). The dimming degree of the peripheral area  1  is increased stepwise ( FIG. 15D , the center area upper limit value and between a peripheral area  1  upper limit value and the peripheral area  1  lower limit value). At a point when the dimming degree of the peripheral area  1  reaches the upper limit value ( FIG. 15E , the center area upper limit value and the peripheral area  1  upper limit value), subsequently, a peripheral area  2  on the outer side of the peripheral area  1  is lit ( FIG. 15E , the center area upper limit value, the peripheral area  1  upper limit value, and a peripheral area  2  lower limit value). The dimming degree of the peripheral area  2  is gradually increased. Finally, all of the center area, the peripheral area  1 , and the peripheral area  2  are lit at the respective upper limit values ( FIG. 15G , the center area upper limit value, the peripheral area  1  upper limit value, and the peripheral area  2  upper limit value). 
     In this modification, the upper limit values and the lower limit values of the dimming degrees of the respective areas are set in advance. The dimming degree of one area is changed stepwise and, thereafter, the dimming degree of the area adjacent to the one area is changed stepwise. If the control is performed in this way, it is possible to gradually change the gradation control without the user being excessively aware of a difference in the dimming degrees between the areas. Further, by setting the upper limit values and the lower limit values of the dimming degrees in advance, it is possible to smoothly change the dimming degrees without disordering a relation of gradations. 
     The lighting control system may be configured to set the upper limit values and the lower limit values of the dimming degrees of the areas in advance to enable the control device or the user to select any one of the patterns shown in  FIGS. 15A to 15G . Consequently, it is possible to easily attain a desired dimming degree and execute lighting control. 
     In the explanation in the first and second embodiments, the wall control and the gradation control are combined. However, the wall control may be realized by being combined with lighting of a plurality of luminaires at fixed brightness separately from the gradation control. For example, the lighting control system may be configured to execute the wall control simultaneously with lighting, at fixed brightness, a luminaire in a position where a person is detected. 
     As explained above, the lighting control system according to the embodiment can realize comfortable gradation control that takes into account subjective brightness felt by a person in a room. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.