JP7612199B2 - Lighting System - Google Patents

Description

The present invention relates to a lighting system.

A lighting system has been proposed that is installed on a wall, ceiling, etc. near the entrance to a building, and that includes a human presence sensor that detects the presence or absence of people near the entrance to the building, and a parent unit and a child unit that have a light-emitting unit that flashes when a person is detected by the human presence sensor to scare people away for crime prevention purposes (see, for example, Patent Document 1).

JP 2019-129058 A

However, lighting systems for crime prevention purposes, such as those disclosed in Patent Document 1, are being offered, and there is a demand for lighting systems that can provide a high crime prevention effect.

The present invention was made in consideration of the above-mentioned reasons, and aims to provide a lighting system that can achieve a high crime prevention effect by utilizing crime-deterrent psychology.

In order to achieve the above object, the lighting system according to the present invention comprises:
A first lighting device is installed on an outer periphery of a window in a building, the outer periphery being located outside the window;
a second lighting device installed on an outer periphery of the window, the first lighting device being installed on an inner side of the window in the building;
A human presence sensor that detects the presence or absence of a person in a preset area adjacent to the window on the outside of the building;
a lighting control device that turns on the first lighting device so that the illuminance of the first lighting device is higher than the illuminance of the second lighting device when a person is detected by the human presence sensor ,
The illuminance difference between the illuminance of the first lighting device and the illuminance of the second lighting device is 144 lux or more .

According to the present invention, when a person is detected by the motion sensor, the lighting control device turns on the first lighting device so that the illuminance of the first lighting device is higher than that of the second lighting device , and the illuminance difference between the illuminance of the first lighting device and the illuminance of the second lighting device is 144 lux or more . As a result, when an unauthorized intruder into a building enters an area adjacent to a window on the outside of the building, particularly at night, the first lighting device turns on so that the illuminance of the first lighting device is higher than that of the second lighting device, causing the window to function as a mirror. Therefore, the unauthorized intruder's figure is reflected on the entire window and the unauthorized intruder can objectively observe his or her own figure, which can induce a crime-suppressing psychology in the unauthorized intruder, thereby achieving a high crime prevention effect.

1A and 1B show a building in which a lighting system according to an embodiment of the present invention is installed, in which FIG. 1A is a cross-sectional view and FIG. 1A and 1B show a lighting device according to an embodiment, in which FIG. 1A is a perspective view and FIG. 1 is a circuit diagram of a light-emitting module according to an embodiment; 2 is a circuit diagram of a lighting control unit according to an embodiment. FIG. 5A to 5C are diagrams illustrating the operation of the lighting control unit according to the embodiment. 1A and 1B are diagrams for explaining the conditions of an experiment conducted on a lighting system according to an embodiment, in which (A) is a diagram showing the illuminance of each of two lighting devices, and (B) is a diagram showing the illuminance difference between the two lighting devices. 13A and 13B show the results of an experiment conducted on a lighting system according to an embodiment, in which (A) is a photograph of a window taken from outside when the illuminance inside the window is higher than the illuminance outside the window, with the absolute value of the illuminance difference being 507.1 lux; (B) is a photograph of a window taken from outside when the illuminance inside the window is higher than the illuminance outside the window, with the absolute value of the illuminance difference being 350.6 lux; (C) is a photograph of a window taken from outside when the illuminance inside the window is higher than the illuminance outside the window, with the absolute value of the illuminance difference being 170.9 lux; (D) is a photograph of a window taken from outside when the illuminance outside the window is higher than the illuminance inside the window, with the absolute value of the illuminance difference being 143.5 lux; and (E) is a photograph of a window taken from outside when the illuminance outside the window is higher than the illuminance inside the window, with the absolute value of the illuminance difference being 310.29 lux.

The following describes a lighting system according to an embodiment of the present invention with reference to the attached drawings. The lighting system according to this embodiment includes a first lighting device installed outside the window of a building, a second lighting device installed inside the window of the building, a human presence sensor that detects the presence or absence of a person in a pre-defined area adjacent to the window on the outside of the building, and a lighting control device that turns on the first lighting device so that the illuminance of the first lighting device is higher than the illuminance of the second lighting device when a person is detected by the human presence sensor. The lighting devices are installed near the windows of the building, and when an unauthorized intruder approaches the window of the building during nighttime hours, the first lighting device turns on so that its illuminance is higher than that of the second lighting device. In this way, the unauthorized intruder's image is projected on the entire window, which creates a crime-deterrent psychological effect on the unauthorized intruder.

As shown in Figs. 1(A) and (B), the lighting system according to the present embodiment includes two linear lighting devices 1 (1A, 1B), a lighting control device 2 that controls the lighting of the lighting device 1, an illuminance sensor 51 that detects the brightness around the lighting device 1A, and a human presence sensor 61 that detects the presence or absence of a person around the lighting device 1A. The lighting device 1A is a first lighting device installed outside the window W in the building H. The lighting device 1B is a second lighting device installed inside the window W in the building H. The mounting position of the lighting devices 1A and 1B is not limited to the upper side of the window W, but may be disposed on the side or lower side of the window W. Here, the glass plate G used for the window W may be transparent. In addition, it is preferable that at least one of the glass plates G of the window W in the thickness direction is covered with a translucent film to increase the reflectance of light incident on the window W. An example of such a translucent film is a heat insulating film. In addition, the translucent film may function as a polarizing film. As shown in FIG. 2(A), each lighting device 1 includes multiple (five in FIG. 1(A)) flexible, long light-emitting modules 21 and a long cover 11 that covers the light-emitting modules 21. The lighting device 1 also includes caps 12 that are attached to both ends of the cover 11 in the longitudinal direction and seal the inside of the cover 11. The cap 12 has outlet holes 12a for guiding the conductive wires L1 and L2 for supplying current to the light-emitting modules 21 to the outside of the cap 12.

As shown in FIG. 2B, the light-emitting module 21 has a plate-shaped circuit board 211 and a light-emitting unit 212. The circuit board 211 is, for example, a long FPC (Flexible Printed Circuits), and a conductor pattern (not shown) is formed on the circuit board 211. The light-emitting units 212 are, for example, SMD (Surface Mount Device) type LED (Light Emitting Diode) light-emitting devices, and are mounted in a row along the Y-axis direction of the circuit board 211. The light-emitting units 212 are connected in a 7-series 2-parallel configuration, for example, as shown in FIG. 3. One current regulator 215 is inserted in each of two series circuits formed by connecting seven light-emitting units 212 in series. As the current regulator 215, for example, MSI45020AT1G manufactured by ON Semiconductor Corporation can be used. The anode side of the series circuit including the seven light-emitting units 212 is commonly connected to the electrode pad 211a via a conductor pattern formed on the circuit board 211. Meanwhile, the cathode of the series circuit including the seven light-emitting elements 212 is connected to the electrode pad 211b via a conductor pattern formed on the circuit board 211. Here, it is preferable that the number of the light-emitting elements 212 and the light emission intensity of each of the light-emitting elements 212 are set so that the illuminance of the lighting device 1A is 145 lux or more. As a result, when the lighting device 1A is turned on and the lighting device 1B is turned off, the absolute value of the illuminance difference between the lighting devices 1A and 1B is 145 lux or more.

Returning to Figures 2(A) and (B), the cover 11 has a cover body 111 formed in a long rectangular tube shape that covers the five light-emitting modules 21, and two long ribs 112 that extend along the Y-axis direction on the -Z direction side of the cover body 111. In other words, the cover 11 body covers the circuit board 211 and multiple light-emitting sections 212 of the light-emitting module 21. Both the cover body 111 and the ribs 112 are made of a soft material. For example, a transparent silicone resin is used as such a soft material.

The illuminance sensor 51 is installed, for example, around the lighting device 1A and is connected to the lighting control device 2 via a signal line (not shown). The illuminance sensor 51 may be an analog illuminance sensor or a digital illuminance sensor. The illuminance sensor 51 outputs an L-level voltage when the detected illuminance is lower than a preset reference illuminance, and outputs a preset H-level voltage higher than the L level once the detected illuminance changes from a state lower than the reference illuminance to a state equal to or higher than the reference illuminance.

The human sensor 61 is installed around the lighting device 1A, for example, and is connected to the lighting control device 2 via a signal line (not shown). The human sensor 61 may be, for example, a sensor equipped with a pyroelectric sensor that detects infrared rays emitted from a person. The human sensor 61 is set so that its detection area includes a predetermined area adjacent to the window W on the outside of the building H when the lighting device 1A is installed outside the window W in the building H. Here, the area adjacent to the window W is set to an area extending from the surface of the window W to a position about 1 m away from the window W, for example. The human sensor 61 has two output ports te1 and te2, as shown in FIG. 4, for example, and when a person is detected, it outputs a predetermined H-level voltage from the output port te1 and outputs a predetermined H-level voltage lower than the H-level from the output port te2. On the other hand, when the human sensor 61 no longer detects a person, it outputs an L-level voltage from the output port te1 and outputs an H-level voltage from the output port te2.

The lighting control device 2 is connected to the signal lines derived from the illuminance sensor 51 and the human presence sensor 61. The lighting control device 2 controls the lighting state of the light-emitting unit 212 of each of the lighting devices 1A and 1B based on the output of the illuminance sensor 51 and the human presence sensor 61. Specifically, when the illuminance detected by the illuminance sensor 51 is equal to or lower than a preset reference illuminance, and when a person is detected by the human presence sensor 61, the lighting control device 2 turns on the lighting device 1A and turns off the lighting device 1B so that the illuminance of the lighting device 1A is higher than the illuminance of the lighting device 1B. On the other hand, when the illuminance detected by the illuminance sensor 51 is equal to or lower than a preset reference illuminance, and when a person is not detected by the human presence sensor 61, the lighting control device 2 maintains the lighting device 1A in an off state and turns on the lighting device 1B. The lighting control device 2 is connected to a power supply circuit 31, which converts the alternating current supplied from an alternating current power source AC into direct current and outputs the direct current, via conductive wires L1 and L2. Here, the power supply circuit 31 has a rectifier smoothing circuit and a step-down chopper circuit, and outputs a DC voltage between the two output terminals teH and teL such that the output terminal teH is at the higher potential.

The lighting control device 2 has four switching elements SW1, SW2, SW4, SW5, three resistors R1, R2, R3, inverters IN1, IN2, a Zener diode ZD1, a comparator CMP, latch circuits 411, 413, a first timer 412, and a second timer 414. The switching elements SW1, SW2, SW4, SW5 are, for example, NPN-type bipolar transistors. The collector of the switching element SW5 is connected to the high-potential output terminal teH of the power supply circuit 31, and the emitter is connected to the electrode pad 211a of the light-emitting module 21. The collector of the switching element SW1 is connected to the electrode pad 211b of the light-emitting module 21, the emitter is connected to the low-potential output terminal teL of the power supply circuit 31, and the base is connected to the latch circuit 413. The switching element SW2 has a collector connected to the electrode pad 211c of the light-emitting module 21 and an emitter connected to the low-potential output terminal teL of the power supply circuit 31. The switching element SW4 has an emitter connected to the low-potential output terminal teL of the power supply circuit 31 via a pull-down resistor R2 and a latch circuit 413, and a collector connected to the high-potential output terminal teH of the power supply circuit 31 via a current-limiting resistor R1. The base of the switching element SW4 is connected to the output port te1 of the human sensor 61. The latch circuit 413 is, for example, an SR flip-flop circuit, and when an input voltage input to an S terminal connected between the collector of the switching element SW4 and the resistor R1 transitions from an L level to an H level, the latch circuit 413 continues to output an H level voltage from a Q terminal until an input voltage input from a second timer 414 to an R terminal transitions from an L level to an H level. The second timer 414 is connected to the output port te2 of the human sensor 61, and starts counting when the output of the output port te2 transitions from L level to H level. After that, when the count number reaches a number corresponding to a preset first reference time, it outputs an H level voltage to the R terminal of the latch circuit 413. Here, the first reference time is set to, for example, several minutes to several tens of minutes.

The inverter IN1 is, for example, an inverting amplifier circuit, and its input terminal is connected to the Q terminal of the latch circuit 413, and its output terminal is connected to the base of the switching element SW2. The comparator CMP is, for example, configured to include an operational amplifier, and when the voltage of the positive input terminal is equal to or higher than the voltage of the negative input terminal, it outputs a preset H level voltage from the output terminal, and when the voltage of the positive input terminal is less than the voltage of the negative input terminal, it outputs an L level voltage lower than the H level from the output terminal. The output terminal of the comparator CMP is connected to the base of the switching element SW5, and the negative input terminal is connected to the cathode of the Zener diode ZD1. The Zener diode ZD1 functions as a constant voltage source, and its cathode is connected to the low potential output terminal teL of the power supply circuit 31, and its anode is connected to the high potential output terminal teH of the power supply circuit 31 via the voltage dividing resistor R3. The inverter IN2 is, for example, an inverting amplifier circuit, and its input terminal is connected to the output terminal (not shown) of the illuminance sensor 51, and its output terminal is connected to the positive input terminal of the comparator CMP. Here, the comparator CMP outputs a voltage of H level when the output voltage of the inverter IN2 is equal to or higher than the reference voltage between both ends of the Zener diode ZD1, and outputs a voltage of L level when the output voltage of the inverter IN2 is less than the reference voltage between both ends of the Zener diode ZD1. The latch circuit 411 is, for example, an SR flip-flop circuit, and when the input voltage input from the comparator CMP to the S terminal transitions from the L level to the H level, it continues to output a voltage of H level to the base of the switching element SW5 until the input voltage input from the first timer 412 to the R terminal transitions from the L level to the H level. When the output of the Q terminal of the latch circuit 411 transitions from the L level to the H level, the first timer 412 starts counting, and then, when the count number reaches a number corresponding to the preset second reference time, it outputs a voltage of H level to the R terminal of the latch circuit 411. Here, the second reference time is set based on the actual time between sunset and sunrise, for example, and is set to 7 hours.

Here, the operation of the lighting control device 2 according to the present embodiment will be described with reference to FIG. 4 and FIG. 5. First, as shown in FIG. 5, as the surroundings of the lighting device 1 become darker, the output voltage Vs of the illuminance sensor 51 gradually decreases accordingly. Here, when the illuminance around the lighting device 1 is equal to or greater than the aforementioned reference illuminance, the output voltage of the inverter IN2 is less than the aforementioned reference voltage, the output voltage of the comparator CMP is maintained at the L level, and the switching element SW5 is maintained in the OFF state. At this time, since no DC power is supplied from the power supply circuit 31 to the light-emitting module 21, both of the light-emitting units 212 of the light-emitting modules 21 of the lighting devices 1A and 1B maintain an off state. Then, at time T1, when the output voltage Vs of the illuminance sensor 51 reaches the voltage Vsth corresponding to the aforementioned reference voltage, the output voltage of the inverter IN2 shown in FIG. 4 becomes equal to or greater than the aforementioned reference voltage, and the voltage input from the comparator CMP to the S terminal of the latch circuit 411 becomes the H level. At this time, the voltage of the Q terminal of the latch circuit 411 is set to the H level. Then, the switching element SW5 is turned on, and DC power is supplied from the power supply circuit 31 to the light-emitting module 21. Here, when the human sensor 61 does not detect a person, the voltage output from the output port te1 of the human sensor 61 to the base of the switching element SW4 is maintained at the L level, and the switching element SW4 is maintained in the OFF state. Then, the S terminal of the latch circuit 413 is pulled down to the voltage level of the output terminal teL on the low potential side of the power supply circuit 31 via the resistor R2, the voltage of the S terminal of the latch circuit 413 is maintained at the L level, and an L level voltage is output from the Q terminal of the latch circuit 413 to the base of the switching element SW1, and the switching element SW1 is maintained in the OFF state. Then, since no current flows from the electrode pad 211a to the electrode pad 211b of the light-emitting module 21 of the lighting device 1A, the lighting device 1A is maintained in the OFF state. On the other hand, the inverter IN1 shown in FIG. 4 outputs a H level voltage, so that the switching element SW2 is maintained in the ON state. In this case, a current flows from electrode pad 211a to electrode pad 211b of the light-emitting module 21 of the lighting device 1B, causing the lighting device 1B to light up. That is, at time T1, only the lighting device 1B is turned on, and the lighting device 1A remains in the off state.

After time T1, at time T2, the motion sensor 61 detects a person. In this case, the voltage output from the output port te1 of the motion sensor 61 to the base of the switching element SW4 changes to H level, and the switching element SW4 is turned on. At this time, the voltage of the S terminal of the latch circuit 413 rises to a voltage level obtained by dividing the voltage generated at the high-potential output terminal teH of the power supply circuit 31 by the resistors R1 and R2, and an H-level voltage is output from the Q terminal of the latch circuit 413 to the base of the switching element SW1, and the switching element SW1 is turned on and off. Then, a current flows from the electrode pad 211a to the electrode pad 211b of the light-emitting module 21 of the lighting device 1A, so that the lighting device 1A is turned on. On the other hand, the inverter IN1 shown in FIG. 4 outputs an L-level voltage, so that the switching element SW2 is turned off. In this case, no current flows from electrode pad 211a to electrode pad 211b of light-emitting module 21 of lighting device 1B, so lighting device 1B is turned off. That is, at time T2, only lighting device 1A is turned on, and lighting device 1B is turned off.

After that, as shown in FIG. 5, immediately after the human sensor 61 stops detecting a human at time T3, the voltage output from the second timer 414 to the R terminal of the latch circuit 413 is maintained at the L level, so that the voltage output from the Q terminal of the latch circuit 413 to the switching element SW1 and the inverter IN1 is maintained at the H level. Therefore, the state in which the switching element SW1 is on and the switching element SW2 is off is maintained, so that only the lighting device 1A is turned on and the lighting device 1B is turned off. At this time, the output voltage from the output port te2 of the human sensor 61 to the second timer 414 transitions from the L level to the H level, and the second timer 414 starts counting. Then, when the count number reaches a number corresponding to the first reference time dT at time T4, the second timer 414 outputs a H level voltage to the R terminal of the latch circuit 413. As a result, the output of the Q terminal of the latch circuit 413 is reset to the L level again, switching element SW2 is turned on, switching element SW1 is turned off, and once again only lighting device 1B is turned on and lighting device 1A is turned off.

When the time elapsed from time T1 reaches the aforementioned reference time, the first timer 412 shown in FIG. 4 outputs an H-level voltage to the R terminal of the latch circuit 411. This resets the output of the Q terminal of the latch circuit 411 to L level again, and the switching element SW5 turns off. Then, both lighting devices 1A and 1B turn off. In this way, when it becomes night and the illuminance detected by the illuminance sensor 51 becomes lower than the reference illuminance, the lighting control device 2 according to this embodiment turns on only the lighting device 1A when a person is present in the detection area of the human sensor 61, that is, the area including the area adjacent to the window W described above, and turns on only the lighting device 1B when no person is present in the predetermined area adjacent to the window W.

Here, the results of an experiment on the relationship between the illuminance difference between the lighting device 1A and the lighting device 1B and the appearance of the window W when viewed from the outside of the window W will be described with reference to Figs. 6 and 7. In the experiment, the appearance of the window W when viewed from the outside of the window W was observed for each of the 10 combinations of illuminance of the lighting devices 1A and 1B. The illuminance of the lighting devices 1A and 1B was set to 10 combinations as shown in Fig. 6(A). Here, the illuminance of the lighting devices 1A and 1B was measured using a CL-200A manufactured by Konica Minolta. In addition, a light-transmitting film was attached to the entire outside of the glass plate G of the window W. As the light-transmitting film, OD651L manufactured by Lintec Corporation was adopted. The absolute value of the illuminance difference for each of the 10 combinations of illuminance of the lighting devices 1A and 1B shown in Fig. 6(A) is shown in Fig. 6(B). 7A to 7B show photographs of the window W taken from the outside of the window W for five combinations of the illuminances of the lighting devices 1A and 1B. Here, Figs. 7A to 7C are photographs in which the illuminance inside the window is higher than the illuminance outside the window, and Figs. 7D and 7E are photographs in which the illuminance outside the window is higher than the illuminance inside the window. Also, Figs. 7A to 7C show absolute values of illuminance difference of 507.1 lux, 350.6 lux, and 170.9 lux, respectively. When the illuminance inside the window is higher than the illuminance outside the window, the image of a person standing inside the window W in the building H is visible in all cases, and the image of a person standing outside the window W in the building H is almost invisible. However, it can be seen that as the absolute value of the illuminance difference becomes smaller, it becomes more difficult to see a person standing inside the window W in the building H. On the other hand, when the illuminance outside the window is higher than the illuminance inside the window, in either case the image of the person standing inside the window W in building H is barely visible, but the image of the person standing outside the window W in building H is visible. The absolute values of the illuminance difference in Figures 7(D) and (E) are 143.5 lux and 310.29 lux, respectively. From this result, it was found that if the illuminance outside the window is higher than the illuminance inside the window and the absolute value of the illuminance difference is 144 lux or more, the image of the person standing inside the window W in building H is barely visible, but the image of the person standing outside the window W in building H is clearly visible.

As described above, according to the lighting device 1 of this embodiment, when a person is detected by the motion sensor 61, the lighting control device 2 turns on only the lighting device 1A so that the illuminance of the lighting device 1A is higher than the illuminance of the lighting device 1B. As a result, when an unauthorized intruder into the building H enters an area adjacent to the window W on the outside of the building H, particularly at night, the lighting device 1A turns on and the lighting device 1B turns off, causing the window W to function as a mirror. Therefore, the unauthorized intruder's figure is reflected on the entire window W and the unauthorized intruder can observe his or her own figure objectively, which induces a crime-suppressing psychology in the unauthorized intruder and provides a high crime prevention effect.

In addition, in this embodiment, at least one thickness direction of the glass plate G of the window W is covered with a light-transmitting film to increase the reflectance of light incident on the window W. The absolute value of the illuminance difference between the illuminances of the lighting devices 1A and 1B is set to 144 lux or more. This allows the window W to function as a mirror that clearly reflects the image of a person detected by the human presence sensor 61 at night.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configuration of each of the above-mentioned embodiments. For example, the lighting control device 2 may be configured to constantly light the lighting devices 1A and 1B. In this case, the lighting control device 2 may turn on the lighting devices 1A and 1B so that the illuminance of the lighting device 1A is lower than that of the lighting device 1B when no person is detected by the human presence sensor 61, and turn on the lighting devices 1A and 1B so that the illuminance of the lighting device 1A is higher than that of the lighting device 1B when a person is detected by the human presence sensor 61. In addition, when the lighting control device 2 turns on the lighting devices 1A and 1B so that the illuminance of the lighting device 1A is higher than that of the lighting device 1B, it is preferable that the absolute value of the illuminance difference between the lighting devices 1A and 1B is set to 145 lux or more.

In the embodiment, an example has been described in which the illuminance sensor 51 and the human presence sensor 61 are separate from the lighting devices 1A and 1B, but this is not limiting, and at least one of the illuminance sensor 51 and the human presence sensor 61 may be built into the lighting device 1A. For example, an opening (not shown) may be formed in at least one of the caps 12 of the lighting device 1A, and the illuminance sensor 51 and the human presence sensor 61 may be stored in the cap 12 such that a part of them faces the outside of the cap 12 from the opening.

In the embodiment, an example has been described in which the lighting devices 1A and 1B are each a flexible linear light source, but the lighting devices 1A and 1B are not limited to this and may be a linear light source that is not flexible.

In an embodiment, the window W may have multiple glass plates arranged to overlap each other in the thickness direction, and the translucent film may cover at least one of the multiple glass plates in the thickness direction.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these. The present invention includes suitable combinations of the embodiments and modifications, and suitable modifications thereto.

The lighting device of the present invention is suitable as a lighting system for crime prevention purposes in houses, facilities, etc.

1A, 1B: lighting device, 2: lighting control device, 11: cover, 12: cap, 12a: lead-out hole, 21: light-emitting module, 31: power supply circuit, 51: illuminance sensor, 61: motion sensor, 111: cover body, 112: rib, 211: circuit board, 211a, 211b: electrode pad, 212: light-emitting part, R1, R2, R3: resistor, 215: current regulator, 411, 413: latch circuit, 412: first timer, 414: second timer, AC: AC power supply, CMP: comparator, IN1, IN2: inverter, L1, L2: conductive wire, SW1, SW2, SW4, SW5: switching element, teH, teL: output terminal, ZD1: Zener diode

Claims (4)

A first lighting device is installed on an outer periphery of a window in a building, the outer periphery being located outside the window;
a second lighting device installed on an outer periphery of the window, the first lighting device being installed on an inner side of the window in the building;
A human presence sensor that detects the presence or absence of a person in a preset area adjacent to the window on the outside of the building;
a lighting control device that turns on the first lighting device so that the illuminance of the first lighting device is higher than the illuminance of the second lighting device when a person is detected by the human presence sensor ,
The illuminance difference between the illuminance of the first lighting device and the illuminance of the second lighting device is 144 lux or more.
Lighting system. At least one side of the window in a thickness direction is covered with a light-transmitting film for increasing the reflectance of light incident on the window.
10. The lighting system of claim 1. The first lighting device is
A long flexible circuit board;
At least one light emitting unit mounted on the circuit board;
and a flexible, long cover formed from a soft material and covering the circuit board and the at least one light emitting unit.
3. A lighting system according to claim 1 or 2 . Further comprising an illuminance sensor for detecting the brightness of the surroundings,
When the illuminance detected by the illuminance sensor is equal to or lower than a predetermined reference illuminance and a person is detected by the human presence sensor, the first lighting device is turned on.
4. A lighting system according to any one of claims 1 to 3 .

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