JP2007200715A - Lighting control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To light lighting equipment with illuminance required by a user for each user or for each of user's work content while reducing costs in a lighting control system. <P>SOLUTION: The lighting control system 1 is provided with the lighting equipment 2, an IC tag 4 carried by the user while storing user information, and an information reader 6 which reads the user information stored in the IC tag 4 so as to control the lighting equipment 2 corresponding to the user information. The user information of the IC tag 4 includes an attribute of the user himself/herself and a user's work attribute preset corresponding to the user, a position of the user, and the user's work contents. The information reader 6 reads the user information from the IC tag 4, recognizes a current position of the user, and controls the lighting equipment 2 on the basis of the user information and the current position of the user. Consequently, it is possible to light the lighting equipment with required illuminance for each user or for each of the user's work contents. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting control system for controlling a lighting fixture in accordance with a user attribute.

  2. Description of the Related Art Conventionally, an illuminance control system that controls a lighting apparatus according to attributes such as a user's sex and preferences is known. As an example of such a system, there is known a pedestrian illumination system that performs appropriate illumination control in accordance with pedestrian attributes and the like (see, for example, Patent Document 1). This pedestrian illumination system includes an illumination lamp, a reader, and a control unit. The reader reads information from an information medium carried by a predetermined pedestrian. Information indicating the attribute of the pedestrian is written on the information medium, and the information can be read from a remote position. The control unit controls the brightness of the illuminating lamp based on information read by the reader during illumination such as at night.

  Note that the brightness of the luminaire targeted in the lighting control varies depending on the room where the person is present and the work content. Non-Patent Document 1 defines illuminance suitable for various rooms in a house and illuminance suitable for work content, that is, operation content. The brightness required for an individual varies depending on the age of the person. Visual acuity changes with aging. For example, the visual acuity of a 60 year old person is about half that of a 20 year old person. For this reason, when performing the same work, a 60-year-old person needs twice as much brightness as a 20-year-old person needs.

In addition to controlling lighting fixtures, there is a home controller that analyzes and predicts behavior based on the location information of people in the building and their changes, and personal identification information, and controls various devices based on the analysis prediction results. It is known (see, for example, Patent Document 2). This home controller will be described with reference to FIG. When the mobile terminal 30 storing the personal identification information communicates with the relay device 31 attached to each room, the relay device 31 receives the personal identification information. After reception, the relay device 31 transmits personal identification information to the home controller 32. The home controller 32 recognizes the position of the individual from the position information, number, etc. of the relay device 31 that has transmitted the personal identification information. Next, the home controller 32 recognizes the individual based on the personal identification information by the personal recognition means, and predicts the next behavior of the individual from the personal position information accumulated in the past. A control signal is transmitted from the home controller 32 to the relay device 31 based on the prediction result. The relay device 31 transmits this control signal to the device 33 that needs to be controlled.
JP 2005-71624 A Japanese Patent Laid-Open No. 2003-244776 JIS Z9110-1979 Illuminance Standard Attached Table 7-1 Housing

  However, in the technique described in Patent Document 1, it is possible to control the lighting based on the attribute of the pedestrian, but the lighting is controlled according to the operation attribute such as the operation content mainly performed by the pedestrian in a specific place. I couldn't.

  In the technique described in Patent Document 2, the home controller 32 receives personal identification information from the mobile terminal 30 via the relay device 31 and recognizes the individual and specifies the position. As a result, it became necessary to prepare a portable terminal for each individual, and the installation cost was high. In addition, when the mobile terminal is moved in a house with the mobile terminal placed in a private room, the mobile terminal cannot be recognized, so the mobile terminal must always be carried around when moving, and the convenience is low. Furthermore, since the home controller 32 performs behavior prediction for determining control of each device, it is necessary to accumulate past personal behavior data, and the behavior data is enormous.

  The present invention has been made to solve the above-described conventional problems, reduces costs, and attributes such as the age and visual acuity of the user, and operation attributes such as the operation content performed by the user at a specific location. Accordingly, it is an object of the present invention to provide a lighting control system that can turn on a lighting fixture at an illuminance required by a user for each user and for each operation content of the user.

  In order to achieve the above object, the invention of claim 1 stores a lighting fixture, user information, an information storage unit carried by the user, and reads user information stored in the information storage unit, In an illumination control system comprising an information reading device that controls a lighting apparatus according to the user information, the user information in the information storage unit includes the user's own attributes, the user, the position of the user, and the use A user's operation attribute set in advance according to the user's operation content, the user's own attribute and the user's operation attribute control information selected according to the user's operation attribute, The information reading device reads user information from the information storage unit, recognizes the current position of the user, and controls the luminaire based on the user information and the current position of the user.

  A second aspect of the present invention is the illumination control system according to the first aspect, wherein a plurality of the lighting fixtures and information reading devices are installed, and any one of the information reading devices reads user information. Controls a plurality of lighting fixtures.

  According to a third aspect of the present invention, in the lighting control system according to the second aspect, when the current position of the user changes, the information reading device that reads the user information changes, and accordingly, the control content of the lighting fixture is changed. It will change.

  A fourth aspect of the present invention is the illumination control system according to any one of the first to third aspects, wherein there are a plurality of the information storage units, and the information reading device is a plurality of uses from the plurality of information storage units. Person information is read, and the lighting apparatus is controlled in accordance with any one of these pieces of user information.

  According to a fifth aspect of the present invention, in the illumination control system according to any one of the first to fourth aspects, the information reading device does not read the next user information for a certain period after reading the user information. In the case of failure, the lighting fixture is turned off.

  According to a sixth aspect of the present invention, in the illumination control system according to any one of the first to fifth aspects, the luminaire includes illuminance measuring means capable of measuring illuminance, and the illuminance measuring means is the illumination. The illuminance of the instrument is measured, and the measurement result is output to the information reading device. The information reading device determines whether the illuminance is higher than or equal to the illuminance determined according to user information.

  According to the first aspect of the present invention, it is possible to control lighting of the luminaire with a necessary illuminance for each user and for each operation content of the user according to the user information. Moreover, since a relay apparatus is not required, cost can be suppressed. Furthermore, since the lighting device is controlled according to the user information, it is possible to prevent the lighting device from being turned on in response to a moving object other than a human such as a pet as in the case of lighting control by a human sensor.

  According to the invention described in claim 2, when a plurality of lighting fixtures are installed in a large room, etc., when one information reader reads user information, the plurality of lighting fixtures are controlled. Therefore, it is possible to control the lighting without a sense of incongruity in actual use.

  According to the third aspect of the present invention, when the information reading device reads the user information during the movement of the user, the control content of the lighting device is determined according to the difference in the distance from the information reading device to the lighting device. Can be changed. Further, a plurality of lighting fixtures can be controlled according to the position of the information reading device that has read the user information and the order in which the device has read the user information.

  According to the invention described in claim 4, when the information reader receives a plurality of pieces of user information, the lighting apparatus is controlled based on any one of the pieces of user information. The content of the control does not change every time it is read, so that the control can be avoided and stable lighting control can be achieved.

  According to the fifth aspect of the present invention, since the lighting device can be turned on only for a certain period after the information reading device reads the user information, forgetting to turn off the lighting can be prevented. Energy saving of the control system can be achieved.

  According to invention of Claim 6, a lighting fixture can be lighted by the illumination intensity more than the illumination intensity required for every user and every operation content of a user.

  A lighting control system according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a configuration of a lighting control system. The lighting control system 1 includes a lighting fixture 2, an operating device 3 for operating the lighting fixture 2, an IC tag 4 (information storage unit) that stores user information and is carried by the user, and an IC tag 4. And an information reading device 6 that reads user information stored in the IC tag 4 and controls the luminaire 2 in accordance with the user information.

  The lighting fixture 2 has a light source such as a lamp that can be turned on, includes a lighting fixture that is fixed to a ceiling or a wall, and a lighting stand, and is operated by an operating device 3.

  The operating device 3 is a portable device such as a remote controller that includes a wireless communication circuit and a control circuit including a CPU that generates a control signal, and is provided in each room of a building. The operating device 3 outputs a control signal for adjusting the illuminance of the luminaire 2 to control the illuminance to the luminaire 2 by infrared rays or weak radio waves, operates the luminaire 2, and controls the information reading device 6. Wireless signals can be sent and received.

  The IC tag 4 stores user information and is attached to, for example, a slipper 5. Since the slipper 5 moves together with the user, it is possible to turn on the luminaire with an illuminance suitable for the user by performing illumination control based on the user information of the user. The user information of the IC tag 4 includes the user's own attribute, the user's operation attribute preset according to the user, the user's position and the user's operation content, and the user's own attribute and use. Control information of the lighting fixture 2 selected according to the operation attribute of the person. The attributes of the user itself include age, sex, visual acuity, and the like. The action attribute of the user includes contents of actions mainly performed by the user in a specific place, for example, a specific room. This behavior attribute includes, for example, sewing in the living room, enjoying entertainment in the living room, reading or studying in the study, washing dishes in the kitchen, looking in the mirror at the entrance, wearing shoes at the entrance. And taking off. Due to such a configuration, it is possible to turn on the luminaire at a necessary illuminance for each user and for each operation content of the user according to the user information.

  The information reading device 6 is composed of an IC tag reading device, and is installed near the entrance of the room. The information reader 6 can transmit and receive signals to and from the IC tag 4 and wirelessly reads user information from the IC tag 4 attached to the slipper 5. In order to perform illumination control based on this user information, an operation signal is wirelessly transmitted from the information reading device 6 to the operation device 3.

  FIG. 2 shows an operation procedure of the illumination control system 1. When the user enters the room, the information reading device 6 reads the user information from the IC tag 4 and recognizes that the user is in the room (S101).

The information reading device 6 calculates the illuminance X of the luminaire 2 necessary for the user based on the user's own attribute and the user's operation attribute in the read user information (S102). Necessary illuminance X is the brightness required for a specific operation in each room defined in JIS Z9110-1979, where Y0 is the average visual acuity of males and females aged 20 When Z is Z, it is calculated by the following mathematical formula 1.

  Furthermore, the information reader 6 compares the required illuminance X calculated by the mathematical formula 1 with the illuminance of the luminaire 2 in a plurality of previously registered illumination control patterns, and the illuminance of the luminaire 2 is greater than or equal to the required illuminance X. An illumination control pattern is selected (S103). The illumination control pattern is control information for lighting the luminaire 2 in accordance with an illuminance pattern registered in advance. An operation signal based on the selected illumination control pattern is transmitted from the information reading device 6 to the operation device 3 (S104). The controller 3 that has received the operation signal transmits a control signal corresponding to the operation signal to the lighting fixture 2 to control the lighting fixture 2 (S105). Thus, since the illumination control system 1 does not require a relay apparatus, cost can be suppressed. Further, since the lighting apparatus is controlled according to the user information, it is possible to prevent the lighting apparatus from being turned on in response to a moving object other than a human such as a pet, as in the case of lighting control by a human sensor.

  Next, an illumination control system according to a second embodiment of the present invention will be described with reference to FIGS. The illumination control system according to this embodiment is different from the illumination control system according to the first embodiment in that a plurality of lighting fixtures and information reading devices are installed in the same room.

  FIG. 3 shows a configuration of the illumination control system 1. The lighting control system 1 includes lighting fixtures 2A and 2B, operating devices 3A and 3B for operating the lighting fixtures 2A and 2B, and IC tag 4 (information storage unit) that stores user information and is carried by the user. ), A slipper 5 to which the IC tag 4 is attached, user information stored in the IC tag 4, and information reading devices 6A and 6B for controlling the lighting fixtures 2A and 2B according to the user information, In the same room. In addition, a lighting fixture, an operating device, and an information reader are not restricted to two units.

  When the information reading devices 6A and 6B read user information from the IC tag 4, the information reading devices 6A and 6B transmit an operation signal to one or both of the operation devices 3A and 3B.

  The controllers 3A and 3B can control both the lighting fixtures 2A and 2B. When the luminaires 2A and 2B are the same luminaire and can be controlled by the same control method, both the luminaires 2A and 2B are controlled by making the channel numbers of the control signals output from the controller identical. be able to. When the control methods of the lighting fixtures 2A and 2B are different, a control unit (not shown) capable of collectively controlling the lighting fixtures 2A and 2B in the same room is provided, and a control signal is sent from the operating devices 3A and 3B to the control unit. Is transmitted to control both of the lighting fixtures 2A and 2B.

  With such a configuration, when a plurality of lighting fixtures are installed in a large room, when one information reading device reads user information and transmits an operation signal corresponding to the user information to the operating device, A plurality of lighting fixtures in the same room can be controlled, and lighting control without a sense of incongruity in actual use is possible.

  FIG. 4 shows an operation procedure of the lighting control system 1. Here, it is assumed that the user is in the vicinity of the information reading device 6B, for example. In such a case, the information reading device 6B reads the user information (S201), selects an illumination control pattern according to the user information and the current position of the user (S202), and operates an operation signal based on the illumination control pattern. The data is transmitted to the device 3B (S203). When the operation device 3B receives the operation signal, the operation device 3B transmits a control signal to the lighting fixtures 2A and 2B to control the illuminance of the lighting fixtures 2A and 2B (S204).

  When the user moves to the vicinity of the information reading device 6A (S205), the information reading device 6A reads the user information (S206), and selects an illumination control pattern according to the user information and the current position of the user (S207). ), An operation signal based on the illumination control pattern is transmitted to the operation device 3A (S208). When receiving the operation signal, the controller 3A transmits a control signal to the lighting fixtures 2A and 2B to control the illuminance of the lighting fixtures 2A and 2B (S209).

  As described above, when the current position of the user changes, the information reading device that reads the user information changes, and the control content of the lighting fixture changes accordingly. For this reason, when the information reading device reads the user information during the movement of the user, the control content of the lighting fixture can be changed according to the difference in the distance from the information reading device to the lighting fixture. For example, it is possible to turn on a lighting fixture that is close to the user with a required illuminance and to turn on a lighting fixture that is far from the user darkly. Further, a plurality of lighting fixtures can be controlled according to the position of the information reading device that has read the user information and the order in which the device has read the user information.

  Next, an illumination control system according to a third embodiment of the present invention will be described with reference to FIGS. When the information reader 6 receives a plurality of pieces of user information, the illumination control system according to the present embodiment is based on any one of the user information, as compared with the illumination control system according to the above embodiment. The difference is that the luminaire is controlled.

  FIG. 5 shows the configuration of the illumination control system. The lighting control system 1 includes a lighting fixture 2, an operating device 3 for operating the lighting fixture 2, a plurality of IC tags 4A and 4B (information storage units) that store user information and are carried by the user. And slippers 5A and 5B to which the IC tag 4 is attached, and an information reading device 6 that reads user information stored in the IC tags 4A and 4B and controls the lighting apparatus 2 according to the user information. .

  The information reading device 6 reads a plurality of user information from the plurality of ICs 4A, 4B, and controls the lighting fixture 2 according to any one of these user information. That is, the information reading device 6 sets information to be preferentially referred to in the illumination control among the user information, stores the information in the memory, and controls the luminaire 2 based on the information. For this reason, when the information reader receives a plurality of pieces of user information, the lighting apparatus is controlled based on any one of the pieces of user information, so that the control content changes each time the user information is read. Therefore, stable lighting control can be achieved while avoiding confusion in control.

  FIG. 6 shows an operation procedure of the lighting control system 1. Here, it is assumed that a plurality of users A and B are in a position where user information can be read by the information reading device 6 in the same room.

  The information reading device 6 reads the user information of the user A and the user information of the user B (S301). After reading, the information reading device 6 determines the priority order of the various user information based on the information of the preset priority order (S302). After the determination, either user information is preferentially referred to (S303), and lighting control of the lighting fixture 2 is performed (S304). Here, the priority order of the user information is determined based on the required illuminance level. For this reason, it becomes possible to light the lighting fixture 2 with the required illuminance of a plurality of users by performing illumination control according to the person with the highest required illuminance or the operation content.

  Next, an illumination control system according to a fourth embodiment of the present invention will be described with reference to FIGS. The illumination control system according to the present embodiment is different from the illumination control system according to the above-described embodiment in that the luminaire 2 includes an illuminance measuring device capable of measuring illuminance.

  FIG. 7 shows a configuration of the illumination control system 1. The lighting control system 1 includes a lighting fixture 2, an operating device 3 for operating the lighting fixture 2, an IC tag 4 (information storage unit) that stores user information and is carried by the user, and an IC tag 4. Is attached to the slipper 5, the user information stored in the IC tag 4 is read, the information reading device 6 that controls the luminaire 2 according to the user information, and the illuminance measurement that measures the illuminance of the luminaire 2 And a vessel 21.

  The illuminance measuring instrument 21 includes an illuminance sensor that measures illuminance such as a photodiode or CdS (Cadmium Sulfide), and is provided on the lamp arrangement surface side of the lighting fixture 2. Further, the illuminance measuring instrument 21 measures the illuminance of the lighting fixture 2 and outputs the measurement result to the information reading device 6.

  The information reading device 6 includes an illuminance determination unit 61 configured by an electric circuit including a CPU for determining whether the current illuminance is lower than the required illuminance. Based on the measurement result from the illuminance measuring device 21, the illuminance determination unit 61 determines whether or not the current illuminance is greater than or equal to the required illuminance determined according to the user information.

  FIG. 8 shows an operation procedure of the illumination control system 1. The illuminance measuring instrument 21 measures the current illuminance of the luminaire 2 and outputs the measurement result to the information reading device 6 (S401). Based on the measurement result from the illuminance measuring device 21, the illuminance determination unit 61 of the information reading device 6 determines whether or not the current illuminance is higher than the necessary illuminance determined according to the user information (S402). When the measurement result is lower than the required illuminance by comparing the measurement result with the required illuminance (Yes in S403), the illumination control is performed so that the illuminance of the lighting fixture 2 is higher than the required illuminance (S404). When the luminaire 2 is a luminaire that can continuously perform illumination control, the luminaire 2 can be turned on with an illuminance with appropriate brightness by repeatedly performing the above operation. If the measurement result is lower than the required illuminance (No in S403), the series of operations ends.

  Due to such an operation, the luminaire 2 can be turned on with an illuminance higher than a necessary illuminance required for each user and for each operation content of the user. In addition, the illuminance can be corrected so that it can be lit above the required illuminance when the illuminance decreases due to a decrease in the luminous flux of the light source, or when the illuminance decreases due to contamination on the light exit surface of the lighting fixture 2 or material deterioration. The lighting fixture 2 can be lit with the required illuminance more reliably.

  Next, an illumination control system according to a fifth embodiment of the present invention will be described with reference to FIG. The illumination control system according to the present embodiment is different from the illumination control system according to the above-described embodiment in that the information reading device 6 automatically turns off the luminaire 6.

  FIG. 9 shows the configuration of the illumination control system 1. The lighting control system 1 includes a lighting fixture 2, an operating device 3 for operating the lighting fixture 2, an IC tag 4 (information storage unit) that stores user information and is carried by the user, and an IC tag 4. Is attached to the slipper 5, the information reading device 6 that reads the user information stored in the IC tag 4 and controls the luminaire 2 according to the user information, and the time measuring unit 62 for measuring time. .

  The time measuring unit 62 is a circuit for measuring time, and is provided in the information reading device 6 to measure an elapsed time after reading user information.

  FIG. 10 shows an operation procedure of the lighting control system 1. After reading the user information, the information reading device 6 causes the time measuring unit 62 to measure the elapsed time (S501). When the time reading unit 62 recognizes the elapse of a certain period and the next user information is not read (Yes in S502), the information reading device 6 automatically turns off the luminaire (S503). If the fixed period has not elapsed (No in S502) and the information reading device 6 reads the next user information (Yes in S504), the elapsed time measured by the time measuring unit 62 is reset. (S505) The operation returns to S501. If the information reading device 6 does not read the next user information (No in S504), the operation returns to S502.

  As described above, after the information reading device 6 reads the user information, the lighting fixture 2 can be turned on only for a certain period of time, so that it is possible to prevent forgetting to turn off the lighting and to save energy of the lighting control system 1. Can be achieved.

  The present invention is not limited to the configuration of the embodiment as described above, and various modifications can be made according to the purpose of use. For example, the user information unit is not limited to the IC tag 4, and may be any device that can read user information by the information reading device 6. Moreover, it is not restricted to the IC tag 4 attached to the slipper 5, The detection means which can detect a user's information may be sufficient. The detection means includes, for example, a weight sensor for confirming the load and a temperature sensor for confirming the body temperature. Further, the IC tag 4 may be attached not only to the slipper 5 but also to what the user always carries in the house. For example, the IC tag 4 may be attached to what the user such as underwear or glasses individually carries in the house. The communication of the user information signal, the control signal, or the operation signal may be performed not by radio but by wire.

  The required illuminance X is not limited to the above calculation method. When the user performs the first operation in the first room, the necessary illuminance according to the first operation performed in the second room, Calculated by multiplying the ratio by the required illuminance corresponding to the second operation performed by the user in the first room. Also good. In addition, the required illuminance X corresponds to the illuminance selected according to the operation attribute, with the difference between the visual acuity at a certain age normalized by the visual acuity at the age of 20 and the visual acuity at the corresponding age of the user as a coefficient. The necessary illuminance X may be calculated by multiplying by a coefficient. The priority order of user information may be determined by user information such as age, sex, eyesight, etc. in addition to the required illuminance.

Further, the illuminance measuring device 21 may be provided not only in the lighting fixture 2 but also in any of the operating device 3, the information storage unit, and the information reading device 6. Further, the illuminance measuring device 21 may be provided independently in the illumination control system 1. The illuminance measuring device 21 not only measures the illuminance but also stores the elapsed time from the start of lamp mounting, the accumulated lamp lighting time, and the like, and uses the previously registered lamp luminous flux decay curve to determine the luminous flux from that time. You may estimate the present illumination intensity by calculating | requiring the value of decline. The illuminance measuring device 21 may output the illuminance measurement result to the operation device 3 including the illuminance determining unit 61.

The figure which shows the structure of the illumination control system which concerns on the 1st Embodiment of this invention. The flowchart which shows the operation | movement procedure of the illumination control by the said illumination control system. The figure which shows the structure of the illumination control system which concerns on the 2nd Embodiment of this invention. The flowchart which shows the operation | movement procedure of the illumination control by the said illumination control system. The figure which shows the structure of the illumination control system which concerns on the 3rd Embodiment of this invention. The flowchart which shows the operation | movement procedure of the illumination control by the said illumination control system. The figure which shows the structure of the illumination control system which concerns on the 4th Embodiment of this invention. The flowchart which shows the operation | movement procedure of the illumination control by the said illumination control system. The figure which shows the structure of the illumination control system which concerns on the 5th Embodiment of this invention. The flowchart which shows the operation | movement procedure of the illumination control by the said illumination control system. The figure which shows the structure of the system using the conventional home controller.

Explanation of symbols

1 Lighting control system 2, 2A, 2B Lighting fixture 3, 3A, 3B Controller 4, 4A, 4B IC tag (information storage unit)
5, 5A, 5B Slippers 6, 6A, 6B Information reader 21 Illuminance measuring device (illuminance measuring means)
61 Illuminance determination unit 62 Time measurement unit

Claims (6)

Lighting equipment,
An information storage unit that stores user information and is carried by the user;
In an illumination control system comprising: an information reading device that reads user information stored in the information storage unit and controls a lighting apparatus according to the user information;
The user information of the information storage unit includes the user's own attributes, the user's operation attributes preset according to the user, the user's position and the user's operation details, and the user's own attributes. And control information of the lighting fixture selected according to the operation attribute of the user,
The information reader reads user information from the information storage unit, recognizes the current position of the user, and controls the lighting apparatus based on the user information and the current position of the user. Lighting control system. A plurality of the lighting fixtures and information readers are installed,
The lighting control system according to claim 1, wherein when one of the information reading devices reads user information, the lighting control system controls a plurality of lighting fixtures.   The lighting control system according to claim 2, wherein when the current position of the user changes, the information reading device that reads the user information changes, and the control content of the lighting fixture changes accordingly.   There are a plurality of the information storage units, and the information reading device reads a plurality of pieces of user information from the plurality of information storage units, and controls the luminaire according to any one of these pieces of user information. The illumination control system according to any one of claims 1 to 3, wherein   5. The information reading device according to claim 1, wherein after the user information is read, if the next user information is not read for a certain period of time, the lighting apparatus is turned off. The lighting control system described. The lighting fixture has illuminance measuring means capable of measuring illuminance,
The illuminance measuring means measures the illuminance of the lighting fixture, and outputs a measurement result to the information reading device,
The illumination control system according to claim 1, wherein the information reading device determines whether the illuminance is equal to or higher than an illuminance determined according to user information.

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