JP5853185B2 - Lighting device and lighting fixture - Google Patents

Description

  The present invention relates to a lighting device and a lighting fixture using the lighting device.

  In recent years, in order to reduce the amount of carbon dioxide emission, which is the main cause of global warming, power saving has been promoted in all electrical devices. In particular, since the power consumption of the lighting device (lighting fixture) accounts for a very high percentage of the power consumption at home, it is desired to save power in the lighting device.

  On the other hand, the present applicant detects the brightness (illuminance) of the illumination environment by a brightness sensor, and the brightness of the illumination environment with respect to a change in outside light other than the illumination light (for example, natural light such as sunlight). We have proposed an illuminating device that automatically adjusts (dimming) the light output of the light source so that is kept constant. For example, in the conventional example described in Patent Document 1, a brightness sensor is provided on a fixture body installed on a ceiling so that a detection value (output voltage value) of the brightness sensor becomes a predetermined target value (target voltage value). Dimming is performed. However, in this conventional example, even if the brightness of the lighting environment is the same, the detection value of the brightness sensor varies greatly depending on the reflectance of the floor, wall, or furniture such as a desk or table. Therefore, for example, if the floor or wall reflectivity is doubled due to room redesign, the brightness of the lighting environment is kept constant unless the target value for the detection value of the brightness sensor is also doubled. It wo n’t sag.

  Therefore, in the conventional example described in Patent Document 1, the detection value of the brightness sensor in a state where the light source is rated-lit when the power is turned on is stored, and the target value of the brightness sensor is set based on the detection value. doing. As a result, the target value is automatically changed when the reflectivity changes due to room redesign, etc., so the automatic dimming function of the lighting device operates normally to keep the brightness of the lighting environment constant. be able to.

  By the way, there is provided an illuminating device that includes a plurality of types of light sources having different light colors and selectively turns on the plurality of types of light sources or simultaneously turns them on to mix colors. When the above-described automatic dimming function is mounted on such a lighting device, it is necessary to set a target value of the brightness sensor for each light source. That is, the detected value of the brightness sensor at the time of rated lighting of each light source is stored while only one type of light source is rated on in order, and the target value of the brightness sensor is set based on the detected value.

JP 2005-243314 A

  However, when detecting the brightness with the brightness sensor while turning on multiple types of light sources one after another, if each light source blinks instantaneously (from rated on to off, from off to rated on), the light Color and brightness change rapidly. Such a sudden change may give a visual stress to the user or may cause an electrical stress to the lighting circuit for lighting the light source.

  The present invention has been made in view of the above problems, and reduces visual stress applied to a user and electrical stress applied to a lighting circuit when setting a target value for the brightness of a lighting environment. With the goal.

The illumination device of the present invention is configured to supply power to the first light source unit, a second light source unit having a light color different from that of the first light source unit, and to turn on the first light source unit. A first lighting circuit unit configured to be able to increase or decrease the amount of power supply, and a second lighting circuit configured to supply power to the second light source unit to light and to increase or decrease the power supply amount to the second light source unit A brightness sensor that includes a photoelectric conversion element and uses an output of the photoelectric conversion element according to the brightness of the illumination environment as a brightness detection value, and the detection value corresponding to the brightness of the illumination environment. A storage unit storing a target value, the first lighting circuit unit is controlled to adjust the light output of the first light source unit, and the second lighting circuit unit is controlled to control the light of the second light source unit. and a control unit for adjusting an output, wherein the control unit, the target value setting to be stored in the storage unit to determine the target value At least one of the first lighting circuit unit and the second lighting circuit unit so that the detection value of the brightness sensor matches the target value stored in the storage unit in the target value setting mode. An automatic dimming control mode for controlling either one of the first lighting circuit unit and the second lighting circuit unit in the target value setting mode, and the first light source unit. The brightness sensor detection value in a state in which only the second light source unit is lit and the brightness sensor detection value in a state in which only the second light source unit is lit in the rated state are stored in the storage unit, and the control The unit sets the target value in the automatic dimming control mode based on a detection value of the brightness sensor in a state where only one of the first light source unit and the second light source unit is lit at rated power. The automatic adjustment In the control mode, the control unit controls the first lighting circuit unit and the second lighting circuit unit to match the detection value of the brightness sensor with the target value. The controller operates to adjust the light output and the light output of the second light source unit, respectively, and the control unit switches the first light source unit and the second light source unit from off to on in the target value setting mode. The first lighting circuit unit and the second lighting circuit unit are controlled to gradually increase the power supply amount, and the power supply amount is switched when the first light source unit and the second light source unit are switched from lighting to extinguishing. The first lighting circuit unit and the second lighting circuit unit are controlled so as to gradually decrease the voltage .

In this lighting device, in the target value setting mode, the time required for the control unit to switch off and turn on the first light source unit and the second light source unit is longer than the time required to detect the brightness of the brightness sensor. Preferably there is.

In the illumination device, in the target value setting mode, the control unit gradually increases the light output of the second light source unit to the rated lighting while gradually decreasing the light output of the first light source unit from the rated lighting. In this way, it is preferable to switch from a state where only the first light source unit is lit at a rated level to a state where only the second light source unit is lit at a rated level .

  The lighting fixture of the present invention includes any one of the lighting devices and a fixture main body that holds the lighting device.

  INDUSTRIAL APPLICABILITY The lighting device and the lighting fixture of the present invention have an effect that it is possible to reduce visual stress applied to the user and electrical stress applied to the lighting circuit when setting a target value for the brightness of the lighting environment. .

Embodiment of the illuminating device which concerns on this invention is shown, (a) is a block diagram, (b) is a circuit block diagram of a lighting circuit part. (a)-(c) is a wave form diagram for demonstrating operation | movement of the control part in the same as the above. (a), (b) is explanatory drawing for demonstrating the target value setting operation | movement of the control part in the same as the above. It is a disassembled perspective view which shows embodiment of the lighting fixture which concerns on this invention. It is sectional drawing same as the above.

  Hereinafter, embodiments of a lighting device and a lighting fixture according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1A, the lighting device of the present embodiment includes two light source units 1, 2, two lighting circuit units 3, 4, a control unit 5, a power factor correction circuit 6, a brightness sensor 7, and a storage. Part 8 and the like. One light source unit (hereinafter referred to as a first light source unit) 1 has a series circuit of one or more light emitting diodes that emit white light. The other light source unit (hereinafter referred to as a second light source unit) 2 has a series circuit of one or more light emitting diodes that emit light bulb light. The light sources 1 and 2 emit light (lights up) when a current flows by applying a voltage obtained by multiplying the forward voltage of each light emitting diode by the number (hereinafter referred to as drive voltage).

  The power factor correction circuit 6 is a conventionally known step-up chopper circuit, and outputs a DC voltage higher than the AC voltage supplied from the commercial AC power supply 100. One lighting circuit unit (hereinafter referred to as a first lighting circuit unit) 3 is a switching unit that steps down the DC voltage output from the power factor correction circuit 6 to a desired DC voltage (driving voltage of the first light source unit 1). It has a power supply circuit. Similarly, the other lighting circuit unit (hereinafter referred to as a second lighting circuit unit) 4 converts the DC voltage output from the power factor correction circuit 6 to a desired DC voltage (driving voltage of the second light source unit 2). It has a switching power supply circuit that steps down.

  As shown in FIG. 1B, the first lighting circuit unit 3 and the second lighting circuit unit 4 include a step-down chopper circuit and drive circuits 30 and 40 that drive the step-down chopper circuit. The step-down chopper circuit is well known in the art, and the cathode of the diode D1 is connected to the positive output terminal of the power factor correction circuit 6, and between the anode of the diode D1 and the negative output terminal of the power factor improvement circuit 6. A series circuit of the switching element Q1 and the resistor R1 is inserted. A smoothing capacitor C1 made of an electrolytic capacitor and an inductor L1 are connected in series between the cathode and anode of the diode D1, and a discharging resistor R2 is connected to both ends of the smoothing capacitor C1. The light emitting diodes LED of the light source units 1 and 2 are connected in series between both ends of the smoothing capacitor C1. The operation of the step-down chopper circuit configured in this way is well known in the art, and the DC voltage stepped down from the input voltage (the output voltage of the power factor correction circuit 6) is smoothed by switching the switching element Q1 at a high frequency. The light is output to the light source units 1 and 2 from both ends of the capacitor C1. The drive circuits 30 and 40 switch the switching element Q1 in accordance with a control signal given from the control unit 5.

  The brightness sensor 7 includes a photoelectric conversion element (not shown) such as a solar cell or a photodiode, and an output circuit that amplifies the output of the photoelectric conversion element and outputs a detection voltage at a level corresponding to the amount of received light (brightness). (Not shown). However, since such a brightness sensor 7 is well known in the art, detailed circuit configuration illustration and operation description are omitted. The storage unit 8 is made of an electrically rewritable nonvolatile semiconductor memory such as a flash memory.

  The control unit 5 includes a microcomputer and hardware such as a memory such as a ROM and a RAM, and a program (software) stored in the ROM and executed by the microcomputer. And the operation | movement (process) of the control part 5 demonstrated below is implement | achieved when a microcomputer runs a program. The operating power supply of the control unit 5 is supplied from a power circuit (not shown) created from the output voltage of the power factor correction circuit 6.

  Here, the control unit 5 operates the switching power supply circuits of the lighting circuit units 3 and 4 intermittently and sets the duty ratio (= T1 / T0 × 100) of the operation period (ON period) T1 to the cycle T0 of the intermittent operation to 100%. The light output of the light source units 1 and 2 can be adjusted (dimmed) by increasing / decreasing within a range of 0% from (see FIG. 2). That is, the light output of the light source units 1 and 2 increases as the duty ratio increases as shown in FIG. 2B, and the light output of the light source units 1 and 2 decreases as the duty ratio decreases as shown in FIG. Decrease. As shown in FIG. 2 (a), when the duty ratio is 100%, the switching power supply circuit is always operated and the light source units 1 and 2 are lit at rated power. When the duty ratio is 0%, the switching power supply circuit is always operated. The light source units 1 and 2 are turned off. In the following description, the above-described duty ratio is referred to as a dimming ratio, and this dimming ratio represents a light output ratio with the light output when the light source units 1 and 2 are rated at lighting being 100%.

  In the present embodiment, the emission color (white) of the first light source unit 1 and the emission color (bulb color) of the second light source unit 2 are different. Therefore, the control unit 5 changes the ratio between the light output (dimming ratio) of the first light source unit 1 and the light output (dimming ratio) of the second light source unit 2 to thereby change the first light source unit 1 and the second light source unit 2. The color of light irradiated from the light source unit 2 to the illumination space can be adjusted (toned). That is, the light color becomes closer to white as the ratio of the light output (dimming ratio) of the first light source unit 1 becomes higher, and the light color becomes lighter as the ratio of the light output (dimming ratio) of the second light source unit 2 becomes higher. Close to color. When the dimming ratio of the first light source unit 1 is higher than 0% and the dimming ratio of the second light source unit 2 is 0%, the light color is white, and the dimming ratio of the first light source unit 1 is When 0% and the dimming ratio of the second light source unit 2 is higher than 0%, the light color is the light bulb color. In the following description, a ratio (ratio) between the dimming ratio of the first light source unit 1 and the dimming ratio of the second light source unit 2 is referred to as a toning ratio.

  By the way, if the 1st light source part 1 and the 2nd light source part 2 are rated lighting by 100% of light control ratio, respectively, a light output will become large too much. Therefore, the control unit 5 adjusts the dimming ratios of the light source units 1 and 2 so that the sum of the dimming ratio of the first light source unit 1 and the dimming ratio of the second light source unit 2 becomes 100%. Is preferred. In the following description, the sum of the dimming ratio of the first light source unit 1 and the dimming ratio of the second light source unit 2 is referred to as the total dimming ratio.

  Here, the control unit 5 receives a control signal (infrared signal) transmitted from a wireless remote controller (not shown), and changes the total dimming ratio and the toning ratio according to the received control signal. The wireless remote control has a switch for increasing / decreasing the total dimming ratio, a switch for changing the toning ratio, etc., and when these switches are operated, the total dimming ratio increases / decreases and the toning ratio changes Send a control signal to indicate For example, when the control unit 5 receives a control signal instructing an increase in the total dimming ratio, the control unit 5 increases the dimming ratio of each of the light source units 1 and 2 and receives a control signal instructing a decrease in the total dimming ratio. The dimming ratio of the light sources 1 and 2 is reduced. In addition, when the control unit 5 receives a control signal instructing to change the toning ratio, the control unit 5 adjusts the ratio of the dimming ratios of the light source units 1 and 2 to change the toning ratio. However, when changing the total dimming ratio, the control unit 5 maintains at least one of the dimming ratio of the first light source unit 1 and the dimming ratio of the second light source unit 2 while keeping the toning ratio constant. Increase or decrease. Similarly, when changing the toning ratio, the control unit 5 changes at least one of the dimming ratio of the first light source unit and the dimming ratio of the second light source unit 2 while keeping the total dimming ratio constant. Increase or decrease. This makes it possible to adjust only the brightness (total light control ratio) without changing the light color, or to adjust only the light color (color control ratio) without changing the brightness (total light control ratio). it can.

  Further, the control unit 5 automatically adjusts the dimming ratio of the first lighting circuit unit 3 and the second lighting circuit unit 4 so that the brightness detected by the brightness sensor 7 matches a predetermined target value. It has a function. Here, as described in the related art, it is necessary to set the target value of the brightness sensor 7 for each of the first light source unit 1 and the second light source unit 2 having different light colors. In other words, the control unit 5 uses the detection value of the brightness sensor 7 in a state where only the first light source unit 1 is lit at a rated value and the detection value of the brightness sensor 7 in a state where only the second light source unit 2 is lit at a rated level. The data is stored in the storage unit 8. Further, the control unit 5 sets the target value of the brightness sensor 7 based on the detected value of the brightness sensor 7 at the time of rated lighting, and causes the storage unit 8 to store the set target value. However, the control unit 5 executes the above-described target value setting operation (target value setting mode) when the AC power supply 100 is turned on or when a control signal instructing target value setting is received from the wireless remote controller. And after setting a target value by target value setting operation, the control part 5 reads the target value memorize | stored in the memory | storage part 8, and performs an automatic light control function (automatic light control mode). However, the target value of the brightness sensor 7 is set based on the difference between the detection value of the brightness sensor 7 in a state where both the light sources 1 and 2 are turned off and the detection value of the brightness sensor 7 at the time of rated lighting. It doesn't matter.

  Next, the target value setting operation of the control unit 5 will be described with reference to FIG. For example, when a control signal for instructing target value setting is received from the wireless remote controller, a target value setting program is executed by the microcomputer of the control unit 5, and as a result, the control unit 5 starts a target value setting operation. The control unit 5 controls the first lighting circuit unit 3 to turn on the first light source unit 1 with a dimming ratio of 100% (rated lighting) (time t0) and cause the brightness sensor 7 to detect the brightness. Here, since the brightness of the illumination environment, particularly the brightness in the presence of outside light, may change abruptly in a short time, it is preferable to average the detection values of the brightness sensor 7 over time. That is, the control unit 5 averages the detection values of the brightness sensor 7 during the period from the time t0 to the time t1, and stores the time average value in the storage unit 8 as the detection value when the first light source unit 1 is rated on. Let

  Subsequently, the control unit 5 turns off the first light source unit 1 and turns on the second light source unit 2 at a rated dimming ratio of 100%. At this time, the control unit 5 gradually reduces the duty ratio of the first lighting circuit unit 3 by gradually decreasing the power supply amount per unit time of the first lighting circuit unit 3 and also the duty ratio of the second lighting circuit unit 4. By gradually increasing the power supply amount, the power supply amount per unit time of the second lighting circuit unit 4 is gradually increased. As a result, the dimming ratio of the first light source unit 1 decreases from 100% to 0% in the period T2 from time t1 to time t2, and the dimming ratio of the second light source unit 2 is from time t1 to time t2. Will increase from 0% to 100%. For example, the control unit 5 changes the dimming ratio of the first light source unit 1 and the second light source unit 2 by 5% every 20 milliseconds, but is not limited thereto. And the control part 5 carries out time average of the detected value of the brightness sensor 7 in the period T3 from the time t2 to the time t3, The time average value is stored in the memory | storage part 8 as a detection value at the time of the rated lighting of the 2nd light source part 2. Remember me. However, in the target value setting mode, the control unit 5 sets a time T2 required for switching the light sources 1 and 2 to be switched off and on to a time T3 (for example, 1 second) required for detecting the brightness of the brightness sensor 7, for example, It is set to 2 seconds.

  Here, as shown in FIG. 3B, the control unit 5 switches the dimming ratio of the first light source unit 1 from 100% to 0% at time t1, and the dimming ratio of the second light source unit 2 from 0%. When it is switched to 100%, the light color and brightness may change abruptly, giving a visual stress to the user, or giving an electrical stress to the lighting circuit portions 3 and 4. On the other hand, in the present embodiment, the control unit 5 gradually increases or decreases (fade in and fade out) the dimming ratio between the first light source unit 1 and the second light source unit 2, so that the user is allowed to set the target value. The visual stress applied and the electrical stress applied to the lighting circuit units 3 and 4 can be reduced. In the target value setting mode, the detection value at the time of rated lighting of the second light source unit 2 may be acquired first, and the detection value at the time of rated lighting of the first light source unit 1 may be acquired later.

  By the way, the life of the step-down chopper circuit constituting the lighting circuit units 3 and 4 is often determined by the deterioration state of the electrolytic capacitor used for the smoothing capacitor C1, and in particular, the electrolytic capacitor is left in a high temperature environment in a non-energized state. Deterioration progresses and the life tends to be shortened. Therefore, when one light source unit 1 (or 2) is turned on at a dimming ratio of 100% and the other light source unit 2 (or 1) is turned off, the lighting circuit unit 3 or 4 that is turned off is smoothed. Since the capacitor C1 is left in a high temperature environment in a non-energized state, the life may be shortened. Therefore, except when all the light source units 1 and 2 are turned off, the control unit 5 sets the duty ratio of the switching power supply circuit of each of the lighting circuit units 3 and 4 to a predetermined lower limit value (for example, 1 %) To 100%. That is, also in the target value setting mode, it is preferable that the control unit 5 sets the dimming ratio of the light source units 1 and 2 to a lower limit value instead of 0%. As a result, even when the dimming ratio is set to the lowest level, a slight current can continue to flow through the smoothing capacitor C1 of the lighting circuit units 3 and 4, so that the smoothing capacitor C1 is left in a high temperature environment in a non-energized state. It will not be done. As a result, the deterioration of the smoothing capacitor C1 (electrolytic capacitor) can be suppressed and the life of the lighting device can be extended. However, the lower limit value of the dimming ratio is not limited to 1%, but to the extent that it does not substantially affect the amount of light or light color irradiated from the lighting device to the illumination space (for example, 1 to 3%). I just need it. Note that “a level that does not substantially affect” means, for example, that most people do not notice the difference in brightness (illuminance) and light color when the dimming ratio is 0% and the lower limit. Means degree.

  Thus, the relationship between the dimming ratio (light quantity) of the light source units 1 and 2 and the brightness (illuminance) of the lighting space does not change even if the reflectance of the furnishings such as floors, walls, desks and tables is different. Only the detection value of the brightness sensor 7 changes. For example, when the target brightness (illuminance) of the illumination space is obtained with a total dimming ratio of 70% when there is no outside light, the dimming ratio of each light source unit 1 and 2 is 100% A value obtained by multiplying the detected value of the brightness sensor 7 by 0.7 becomes the target value of the brightness sensor 7 when each of the light source units 1 and 2 is lit alone. And the brightness of illumination space is adjusted by the control part 5 adjusting the dimming ratio of the 1st light source part 1 (or 2nd light source part 2) so that the detection value of the brightness sensor 7 may correspond with target value. The target brightness will be maintained. Further, when both the first light source unit 1 and the second light source unit 2 are turned on, that is, when toning, the control unit 5 controls the dimming ratio of the first light source unit 1 according to each toning ratio. By adjusting the dimming ratio of the second light source unit 2, the brightness of the illumination space is maintained at the target brightness.

  In the target value setting mode, the control unit 5 acquires the detection value of the brightness sensor 7 while switching the first light source unit 1 from turning on to turning off and simultaneously switching the second light source unit 2 from turning off to lighting. It doesn't matter. For example, when the dimming ratio between the first light source unit 1 and the second light source unit 2 is increased or decreased by 5% every 20 milliseconds as described above, the control unit 5 is set for each dimming ratio (toning ratio). The detection value of the brightness sensor 7 may be acquired and stored in the storage unit 8. In this way, it is possible to finely set the target value of the automatic light control at the time of color adjustment, and the accuracy of the automatic light control can be improved.

  The lighting device of the present embodiment is used in a lighting fixture 10 as shown in FIGS. The lighting fixture 10 is a so-called ceiling light that is installed using a hook ceiling 201 installed on the ceiling surface 200 as shown in FIG. The lighting fixture 10 includes a fixture body 11, an upper LED unit 12, an upper frame 13, an upper panel 14, a reflector 15, a lower LED unit 16, a lower LED unit 17, a light receiving unit 18, a lower panel 19, a mounting bracket 20, and the like. Prepare.

  The instrument body 11 includes a substantially square central top plate 21, an upper side plate 22 connected to the outer side of the central top plate 21, a side top plate 23 connected to the upper side plate 22, and a side ceiling. The lower side plate 24 connected to the outer side of the plate 23 is integrally formed with a thin metal plate.

  There are a total of four upper LED units 12, each of which has an LED substrate 25 attached to the outer surface of the upper side plate 22 of the instrument main body 11 with the irradiation direction directed laterally, and the LED substrate 25 is attached by a translucent lens cover 26. Covered. On the LED board 25, a part of the light-emitting diode of the light bulb color that constitutes the second light source unit 2 is mounted. When these light emitting diodes emit light, light bulb-colored light is radiated toward the side portion of the fixture body 11 and the ceiling surface 200 through the lens cover 26. The four upper LED units 12 are respectively installed at positions facing the four sides of the fixture body 11 formed in a substantially square shape.

  There are a total of four lower LED units 17, and LED substrates 27 are attached inwardly on the lower surface of the upper side plate 22 of the instrument body 11 and have a lens cover 28 having translucency. Note that a part of the white light-emitting diode constituting the first light source unit 1 and a part of the light bulb-colored light-emitting diode constituting the second light source unit 2 are mounted on the LED substrate 27. When these light emitting diodes emit light, the light reflected by the reflecting plate 15 is emitted toward the lower side of the instrument body 11 through the lens cover 28.

  The upper frame 13 is formed in a rectangular frame shape, and is attached to the upper surface side of the main body 11 so as to cover the upper LED unit 12 from above. An upper panel 14 is attached to the upper part of the upper frame 13. The reflection plate 15 is formed in a substantially truncated pyramid shape with a central portion protruding downward, and is attached to the lower surface side of the instrument body 11 with a screw 16. A light receiving unit 18 for receiving an infrared signal transmitted from the wireless remote controller and a flat rectangular box shape made of a translucent material are formed on the lower surface of the reflecting plate 15 to cover the lower LED unit 17 and the reflecting plate 15. A lower panel 19 is attached. The mounting bracket 20 is fixed to the center of the instrument body 11, and is detachably attached to the hooking ceiling 201. The lighting device is electrically connected to the AC power supply 100 via the mounting bracket 20 and the hooking ceiling 201.

1 1st light source part (light source part)
2 Second light source (light source)
3 First lighting circuit (lighting circuit)
4 Second lighting circuit (lighting circuit)
5 Control unit 7 Brightness sensor 8 Storage unit

Claims (4)

A first light source unit, a second light source unit having a light color different from that of the first light source unit, a power supply to the first light source unit to be turned on, and a power supply amount to the first light source unit can be increased or decreased. A first lighting circuit unit, a second lighting circuit unit configured to supply power to the second light source unit so that the second light source unit is lit and increase or decrease the amount of power supplied to the second light source unit, and a photoelectric conversion element. A brightness sensor having an output of the photoelectric conversion element corresponding to the brightness of the illumination environment as a brightness detection value, and a storage unit storing the target value of the detection value corresponding to the brightness of the illumination environment And a controller that controls the first lighting circuit unit to adjust the light output of the first light source unit, and controls the second lighting circuit unit to adjust the light output of the second light source unit; With
The control unit determines a target value setting mode in which the target value is determined and stored in the storage unit, and the detection value of the brightness sensor is stored in the target value stored in the storage unit in the target value setting mode. An automatic dimming control mode for controlling at least one of the first lighting circuit unit and the second lighting circuit unit so as to match,
In the target value setting mode, the control unit controls the first lighting circuit unit and the second lighting circuit unit, and the detected value of the brightness sensor in a state where only the first light source unit is rated-lit. And the storage unit stores the detected value of the brightness sensor in a state where only the second light source unit is lit at a rated level, and the control unit further includes any one of the first light source unit and the second light source unit. Based on the detection value of the brightness sensor in a state where only one of them is lit at a rated level, the target value in the automatic light control mode is set to operate,
In the automatic dimming control mode, the control unit controls the first lighting circuit unit and the second lighting circuit unit to match the detection value of the brightness sensor with the target value. Operate to adjust the light output of one light source unit and the light output of the second light source unit, respectively;
In the target value setting mode, the control unit is configured to gradually increase a power supply amount when switching the first light source unit and the second light source unit from turn-off to lighting. The first lighting circuit unit and the second lighting circuit unit are configured to control the lighting circuit unit and to gradually decrease the amount of power supply when the first light source unit and the second light source unit are switched from lighting to lighting off. The lighting device characterized by controlling . In the target value setting mode, the time required for the control unit to switch off and turn on the first light source unit and the second light source unit is equal to or longer than the time required for brightness detection of the brightness sensor. The lighting device according to claim 1. In the target value setting mode, the control unit is in the so that gradually increasing until rated lighting the light output of the second light source section while gradually decreasing from the rated lighting the light output of the first light source unit, 3. The lighting device according to claim 1, wherein the lighting device is switched from a state in which only the first light source unit is lit at a rated level to a state in which only the second light source unit is lit at a rated level .   A lighting fixture comprising: the lighting device according to any one of claims 1 to 3; and a fixture body that holds the lighting device.

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