JP5877326B2 - Lighting system - Google Patents

Description

  The present invention relates to a lighting system capable of realizing energy saving of electric power by dimming a lighting fixture.

  Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2009-295399 (Patent Document 1), there is known an energy saving technology for electric power by determining the presence or absence of a person and reducing illuminance by using a human sensor. ing.

2009-295399

  However, in the above-described conventional lighting system, energy saving is realized by determining the presence or absence of a person with a human sensor and lighting or dimming the lighting device in the lighting area. Therefore, if there is an area where no human is detected by the human sensor, the illumination in that area is turned off or dimmed. Therefore, there is a problem that part of the area is turned off and the atmosphere of the entire area is destroyed.

  The present invention was invented in view of the background art described above, and its purpose is to maintain the comfort without changing the atmosphere in the lighting area even when the lighting apparatus is switched to the energy saving mode. Is to provide a lighting system.

  An illumination system comprising an irradiating unit that illuminates a space and a dimming control unit that performs dimming control of the irradiating unit, wherein the irradiating unit includes a wall surface irradiating unit 32 that illuminates a wall surface, and a base irradiating unit that illuminates the entire space 31 and the dimming control unit can switch the irradiation unit between a normal mode and an energy saving mode, and the energy saving mode lowers the illuminance of the irradiation unit as compared with the normal mode, and the base irradiation The illumination system is characterized in that the illuminance reduction width of the portion is larger than the illuminance reduction width of the wall surface irradiation portion.

  Further, in the energy saving mode, the illumination system may be characterized in that the illuminance reduction width of the wall surface irradiation unit is zero.

  Moreover, the said illumination system may have the lighting fixture which has a base irradiation part and a wall surface irradiation part, The illumination system characterized by the above-mentioned may be sufficient.

  Further, the illumination system includes the intensive irradiation unit 37 that irradiates a specific irradiation position. In the energy saving mode, the illuminance reduction width of the important irradiating unit is equal to or less than the illuminance reduction width of the base irradiation unit. The illumination system may be characterized in that it is equal to or greater than the illuminance reduction width of the irradiation unit.

  Moreover, the said light control part may have a timer part, and the illumination system characterized by switching a normal mode and an energy saving mode according to the result of the said timer part may be sufficient.

  In the lighting system of the present invention, the atmosphere of the entire space can be maintained as it is even in the energy saving mode. Thereby, energy saving can be realized while maintaining comfort.

It is an experimental instrument block diagram of Feu measurement experiment. It is a figure which shows the correlation with the geometric average brightness | luminance of a front wall same as the above, and color mode boundary brightness | luminance. It is a figure which shows the structure of a test patch brightness fixed presentation apparatus same as the above. It is a figure which shows experimental equipment same as the above. (A) (b) (c) It is a figure which shows the experimental result for every lighting fixture same as the above. It is a figure which shows a residence room same as the above. (A) (b) It is a figure which shows the external appearance and light distribution curve of the lighting fixture (vertical corner light) same as the above. (A) and (b) are top views which show the specific area | region which calculates geometric average brightness | luminance. It is the figure which looked at the specific area | region which calculates geometric average brightness | luminance same as the above from the gaze direction. (A) (b) (c) It is a figure which shows the experimental result for every lighting fixture same as the above. It is a figure which shows the correlation with the geometric average brightness | luminance of the area | region G same as the above, and color mode boundary brightness | luminance. It is a block diagram of the illumination system in Embodiment 1. It is the fixture installation schematic of the illumination system in Embodiment 1. It is sectional drawing of the lighting fixture 34 used for Embodiment 2. FIG. It is a side view of the lighting fixture 34. FIG. It is a block diagram of the illumination system in Embodiment 3. It is the fixture installation schematic of the illumination system in Embodiment 3. It is a lighting system block diagram containing a timer part. It is equipment arrangement | positioning in the experiment facility in the case of Feu value measurement. It is a figure which shows the measurement result in a measurement experiment. It is a correlation diagram of Feu value and accumulation establishment.

(Feu value calculation theory)
In the present invention, the “brightness sensation index” is used in order to numerically determine the feeling of brightness. Hereinafter, the “brightness index” will be described.

  The “brightness sensation index” is a comprehensive evaluation of “brightness” that can be felt with respect to the space when the illumination space is observed. In the present invention, the “brightness sensation index” is defined quantitatively. “Color mode boundary luminance” in the concept of illumination-recognition visual space (Reference (1): Evaluation of the sense of brightness in the real environment by measuring the size of the brightness of the illumination-recognition visual space, The Journal of the Illuminating Society of Japan, Vol. 86, No. 11, 2002, P830-836, Yamaguchi et al.). Here, “color mode boundary luminance” means that a color chart (hereinafter referred to as a test patch) placed in an illuminated room is viewed from an observer (subject) and placed in that room. It is an intermediate color between the brightness level recognized as an object (object color) and the brightness level recognized as a light source that emits light (light source color). This is the level of luminance that is visible, and it quantitatively represents the brightness of the illuminated room.

Moreover, it has been shown that the additiveness of the color mode boundary luminance is established in a non-uniform illumination environment (Reference (2): Additivity of the sense of brightness of the space in a non-uniform illumination environment, 36th Illuminating Society of Japan. National Conference Proceedings, P154, 2003, Yamaguchi et al.) When a certain lighting environment K1 is the sum of the lighting environments K2 and K3, the lighting environment K1 is the sum of the color mode boundary luminances in the lighting environments K2 and K3. It has been demonstrated that the color mode boundary luminance at can be predicted.

  From the above, the “color mode boundary luminance” in the concept of illumination-recognition visual space can quantitatively grasp the sense of brightness of the space, and “brightness” that defines the sense of brightness of the room where a certain luminaire is installed It can be said that it is technically possible to set a “sensory index”.

  For this color mode boundary luminance setting, the test patch luminance presentation device 5 shown in FIG. 3 is used. The test patch luminance presentation device 5 includes a light source box 5a containing a light source system 5b configured by a slide projector using a halogen light bulb as a light source, and an optical system box containing a rotational density filter 5d. 5c, a movable flat mirror 5e, and a test patch T provided at a height of 1100 mm from the installation plate 5a by a support 5f. The test patch T is locally illuminated by the light passing through the rotational density filter 5d from the light source system 5b reflected by the movable plane mirror 5e. The subject can freely adjust the brightness of the test patch T by rotating the rotational density filter 5d with a switch at hand. Further, the test patch T is inclined at an angle of 45 ° downward so that the irradiation surface is hardly affected by illumination. The test patch T has a size of 60 mm × 60 mm, and the irradiated surface is made of N5 and gray paper.

From the “color mode boundary luminance A” measured by operating the test patch luminance presentation device 5, a “brightness sensation index F” is derived based on the following [Equation 1], and the unit is “feu”. ]. The unit of “color mode boundary luminance A” is [cd / m 2].
[Equation 1]
F = A / 2
The outline of the brightness sensation index defining method based on the “color mode boundary luminance A” will be described below.

  First, as shown in FIG. 4, an 8-tatami real-sized residential room R with a room size of 3500 mm × 3500 mm and a ceiling height of 2500 mm is prepared as a standard measurement environment, and the ceiling and walls have a white cloth finish. One side of the wall is partitioned with a white roll screen, the floor has a dark brown flooring finish, the ceiling and wall reflectivity is 80%, and the floor reflectivity is 10%.

  Using the test patch luminance presentation device 5 shown in FIG. 3, “color mode boundary luminances A1 to An” when various lighting fixtures L1 to Ln are individually arranged in the residential room R are measured, and the above [ Based on Formula 1, the individual “brightness sensation indices F1 to Fn” of the lighting fixtures L1 to Ln are calculated.

  Next, a lighting fixture Lr (dashed line in FIG. 4), which is a ceiling-mounted ceiling light with a milky acrylic cover, is installed in the center of the room in the measurement environment. The luminaire Lr can be dimmed in the range of 25% to 100%, and measures the “color mode boundary luminance Ar” when dimming so as to obtain just the right brightness by subject's subjective evaluation. 1], “required brightness sensation index Fr” in the measurement environment is set.

  Next, the installation position of the luminaire is determined from the shape, interior layout, and size of the room, and the sum of the “brightness sensation index F” of the luminaire arranged at each installation position is “required brightness sensation index Fr”. The lighting fixture is selected from the lighting fixtures L1 to Ln. For example, if the lighting fixtures L10, L15, and Ln are selected and the brightness sense indexes F10, F15, and Fn of the respective lighting fixtures are selected, Fr = [F10 + F15 + Fn] may be obtained.

In this manner, by defining the “brightness sensation index F” based on the “color mode boundary luminance A”, the “luminance sensation index Fr” is set to “ If the lighting fixtures are combined so that the “sum of brightness sensation index” becomes the “required brightness sensation index Fr” of the room, even in a room mainly composed of indirect lighting or wall lighting in one room, In consideration of the room conditions, it is possible to realize a lighting environment with a required brightness suitable for the purpose of the room.

  In other words, by performing addition based on the value of “brightness sensation index” for each lighting fixture described in the catalog, etc., even a general user without specialized knowledge can easily achieve a lighting environment with the required brightness. The combination of lighting fixtures to be determined can be determined.

  However, in the above method, it is necessary to measure the “color mode boundary luminance A” for each lighting fixture, which takes a lot of man-hours, and the measurement of the “color mode boundary luminance A” is a measurement based on an individual sense. Therefore, there is a possibility that measurement errors due to sensory blur for each individual may increase.

  Therefore, in the present invention, “geometric mean luminance” excluding measured data of “color mode boundary luminance A” under various conditions and light source luminance of a specific area in the illumination space within the observer's field of view under the various conditions. Is defined based on an empirical formula derived from the correlation, and “brightness sensation index F” is defined when a certain condition is set. explain.

  First, in the residential room R shown in FIG. 4, the approximate center on the back wall R1 side facing the roll screen on the right hand is set as the viewpoint position P of the subject.

  The lighting fixtures used are the three lighting fixtures L1, L2, and L3 of the indirect lighting system that are arranged so that the light source cannot be seen by the subject. As the lighting fixture L1, a vertical corner light is disposed in the vicinity of the right corner of the front wall R2 facing the viewpoint position P of the subject. As the lighting fixture L2, a floor-mounted horizont light is disposed in the vicinity of the left corner of the front wall R2. As lighting fixture L3, a floor stand is arrange | positioned in the left corner vicinity of back wall R1. In addition, each of these lighting fixtures L1, L2, and L3 can be dimmed by the dimmer 7 arranged at the hand of the subject.

  First, the test patch luminance presentation device 1 is installed so that the test patch T is located 2500 mm from the back wall R1, and the “color mode boundary luminances A1, A2, A2, A2, and B3 when the lighting fixtures L1, L2, and L3 are lit alone are installed. A3 "was measured. The measurement of the “color mode boundary luminances A1, A2, A3” is performed by dimming each of the lighting fixtures L1, L2, L3, and measured by the “illuminance meter 4” installed at the center of the floor of the room. The test was performed three times under a plurality of conditions with different illuminances.

  Also, under the above-mentioned plurality of conditions, the value of the “geometric mean luminance Ba” of the front wall R2 facing the viewpoint position P is calculated from the light distribution data of each lighting fixture L1, L2, L3 using the radiosity method. Calculated by simulation. Here, the value of each “geometric average luminance Ba” of the lighting fixtures L1, L2, and L3 is set to “geometric average luminance Ba1, Ba2, Ba3”. The unit of “geometric mean luminance Ba” is [cd / m 2].

  FIGS. 5A, 5B, and 5C show the measurement results of the “color mode boundary luminances A1, A2, and A3” and the simulation results of “geometric average luminances Ba1, Ba2, and Ba3” of the front wall R2. FIG. 5 (a) shows the result when the lighting fixture L1 is lit, FIG. 5 (b) shows the result when the lighting fixture L2 is lit, and FIG. 5 (c) shows that the lighting fixture L3 is lit. The results are shown respectively.

FIG. 2 shows the “floor center illuminance” shown in FIGS. 5A, 5B, and 5C with “geometric mean luminance Ba” of the front wall R2 on the horizontal axis and “color mode boundary luminance A” on the vertical axis. The graph shows the relationship between the average value of the measurement results of “color mode boundary luminance A1, A2, A3” and the simulation result of “geometric average luminance Ba1, Ba2, Ba3” under various conditions.

A straight line 50 in FIG. 2 is a straight line obtained by linear regression with respect to all plot points, and as a result of the linear regression analysis, the coefficient of determination shows a high value of 0.85. That is, it can be said that there is a high correlation between the “color mode boundary luminance A” and the “geometric average luminance Ba” of the front wall R2, and the “color mode boundary luminance A” and the “geometric average luminance Ba of the front wall R2”. ] Is expressed by the following [Equation 2]. Therefore, the “color mode boundary luminance A” can be estimated from the “geometric mean luminance Ba” of the front wall R2.
[Equation 2]
A = 0.92Ba
When “brightness sensation index F” is defined as ½ of “color mode boundary luminance A”, “brightness sensation index F” is expressed by the following [Equation 3].
[Equation 3]
F = 0.46Ba
As described above, the correlation between the “color mode boundary luminance A” and the “geometric mean luminance Ba” of the front wall R2 (see [Expression 2] above), “brightness sense index F”, and “color mode boundary luminance A”. "Brightness sensation index F" can be defined as a function of "geometric mean brightness Ba" of front wall R2 (see above [Equation 3). ]reference).

  A specific example will be described below. A room R: 3600 mm × 3600 mm and a ceiling height: 2500 mm shown in FIG. 6 is set as a standard condition room, and the luminaire L1 (vertical corner light) shown in FIG. It is arranged in the vicinity of the right corner of the front wall R2 facing the wall.

  Then, when setting the “brightness sensation index F” for each lighting fixture for this lighting fixture L1, first, the “geometric mean luminance Ba” of the front wall R2 when the lighting fixture L1 is lit alone is set. Calculated by a simulation using the radiosity method.

  When performing a simulation, first set the conditions of the target room (size, interior reflectance, arrangement of lighting fixtures, etc.), and each interior based on the lighting fixture conditions (light flux, light distribution data, etc.) The direct illuminance incident on the surface is calculated. Next, the mutual reflection component when each interior surface is used as a light source is calculated using the radiosity method, and finally the light flux incident on each interior surface is determined, and then the viewpoint position, gazing point and field of view range are determined. By setting, it is possible to obtain the luminance distribution of each interior surface in the field of view.

  In the case of the residence room R shown in FIG. 6, the size of the residence room R is set to an X-direction dimension of 3600 mm, a Y-direction dimension of 3600 mm, and a Z-direction dimension of 2500 mm in a three-dimensional space having an X axis, a Y axis, and a Z axis. Then, set the interior reflectance of each interior surface. In the vicinity of the right corner of the front wall R2 facing the subject's viewpoint position P, light distribution curves J1 and J2 shown in FIG. 7B (J1 is a horizontal light distribution curve and J2 is a vertical light distribution). A lighting fixture L1 (vertical corner light) having a curved line is shown. Further, the coordinates of the viewpoint position P (X, Y, Z) = (1800 mm, 0 mm, 1250 mm), the position coordinates of the gazing point Q (X, Y, Z) = (1800 mm, 3600 mm, 1250 mm), and the field of view range. Assuming that the front wall R2 is used, a simulation result of 12.1 [cd / m2] was obtained for the “geometric mean luminance Ba” of the front wall R2 shown in FIG. As described above, the “geometric mean luminance Ba” of the front wall R2 can be objectively calculated by a calculation simulation using the radiosity method based on the light distribution data of each lighting fixture.

Then, the “brightness sensation index F” of the lighting fixture L1 is F = 0.
46Ba = 5.57 [feu] is set, and while maintaining the correlation between the “brightness sensation index F” and the “color mode boundary luminance A”, the “geometric average luminance Ba of the front wall R2 calculated objectively” is set. "Brightness sensation index F" of an illumination space with little error due to the subjectivity of the individual can be easily obtained.

  In addition, since the “geometric mean brightness Ba” for each lighting fixture is calculated by the above-described calculation simulation, it is not necessary to measure “color mode boundary luminance A” for each lighting fixture, and the number of man-hours can be reduced.

  On the other hand, as shown in FIGS. 8A and 8B, the upward direction θ1 = 35 ° and the downward direction θ2 = 50 from the visual point direction P1 from the viewpoint position P of the subject based on the range of the effective visual field of the human. A region G within a viewing angle of θ, left direction θ3 = 50 °, right direction θ4 = 50 ° is set, and “geometric mean luminance Bb” in the region G is set as the light distribution data of each of the lighting fixtures L1, L2, and L3. Therefore, it can be calculated by a calculation simulation using the radiosity method.

  In the residential room R shown in FIG. 4, the region G when looking at the approximate center of the front wall R <b> 2 from the viewpoint position P of the subject is a three-dimensional region as shown in FIG. 9.

  In the residential room R, as in the previous example, the three lighting fixtures L1, L2, and L3 of the indirect lighting system are arranged so that the light source is not visible to the subject, and the lighting fixtures L1, L2, and L3 are arranged. “Color mode boundary luminances A1, A2, and A3” in the case of lighting alone were measured. The measurement of the “color mode boundary luminances A1, A2, A3” is performed by dimming each of the lighting fixtures L1, L2, L3, and measured by the “illuminance meter 4” installed at the center of the floor of the room. The test was performed three times under a plurality of conditions with different illuminances.

  Moreover, the value of the “geometric mean brightness Bb” of the region G was calculated from the light distribution data of each of the lighting fixtures L1, L2, and L3 by a calculation simulation using the radiosity method under the plurality of conditions. Here, the value of each “geometric average luminance Bb” of the lighting fixtures L1, L2, and L3 is set to “geometric average luminance Bb1, Bb2, Bb3”.

  FIGS. 10A, 10B, and 10C are tables showing the measurement results of the “color mode boundary luminances A1, A2, A3” and the simulation results of “geometric mean luminances Bb1, Bb2, Bb3” of the region G. FIG. 10A shows the result when the lighting fixture L1 is lit, FIG. 10B shows the result when the lighting fixture L2 is lit, and FIG. 10C shows that the lighting fixture L3 is lit. Each case result is shown.

  In addition, the reflectance of the interior surface of the experimental equipment is actually measured, and the reflectance of the interior surface of the residential room R used for the simulation is 79% for the ceiling and 81% for the wall. The floor reflectivity is 9.8%, and the roll screen reflectivity is 68%.

  FIG. 11 shows “geometric mean luminance Bb” of the region G on the horizontal axis of the logarithmic scale and “color mode boundary luminance A” on the vertical axis of the logarithmic scale. The graph shows the relationship between the average value of the measurement results of “color mode boundary luminances A1, A2, A3” and the simulation result of “geometric average luminances Bb1, Bb2, Bb3” under various conditions with different “floor center illumination”. It is a thing.

A straight line 51 in FIG. 11 is a straight line obtained by linear regression with respect to all plot points, and as a result of the linear regression analysis, the coefficient of determination shows a high value of 0.93. That is, it can be said that there is a high correlation between the “color mode boundary luminance A” and the “geometric average luminance Bb” of the region G. The relationship with "
]. Therefore, the “color mode boundary luminance A” can be estimated from the “geometric mean luminance Bb” of the region G.
[Equation 4]
A = 3.0Bb ^0.7
When “brightness sensation index F” is defined as ½ of “color mode boundary luminance A”, “brightness sensation index F” is expressed by the following [Equation 5].
[Equation 5]
F = 1.5Bb ^0.7
As described above, the correlation between the “color mode boundary luminance A” and the “geometric mean luminance Bb” of the region G (see the above [Expression 4]), the “brightness sense index F”, and the “color mode boundary luminance A”. "Brightness sensation index F" can be defined as a function of the "geometric mean luminance Bb" of the region G (see the above [Equation 5). ]reference).

  A specific example will be described below. A room R: 3600 mm × 3600 mm and a ceiling height: 2500 mm shown in FIG. 6 is set as a standard condition room, and the luminaire L1 (vertical corner light) shown in FIG. It is arranged in the vicinity of the right corner of the front wall R2 facing the wall.

  Then, when setting the “brightness sensation index F” for each lighting fixture for this lighting fixture L1, first, the “geometric mean luminance Bb” of the region G when the lighting fixture L1 is lit alone, It is calculated by a calculation simulation using the radiosity method.

  When performing a simulation, first set the conditions of the target room (size, interior reflectance, arrangement of lighting fixtures, etc.), and each interior based on the lighting fixture conditions (light flux, light distribution data, etc.) The direct illuminance incident on the surface is calculated. Next, the mutual reflection component when each interior surface is used as a light source is calculated using the radiosity method, and finally the light flux incident on each interior surface is determined, and then the viewpoint position, gazing point and field of view range are determined. By setting, it is possible to obtain the luminance distribution of each interior surface in the field of view.

  In the case of the residence room R shown in FIG. 6, the size of the residence room R is set to an X-direction dimension of 3600 mm, a Y-direction dimension of 3600 mm, and a Z-direction dimension of 2500 mm in a three-dimensional space having an X axis, a Y axis, and a Z axis. Then, set the interior reflectance of each interior surface. In the vicinity of the right corner of the front wall R2 facing the subject's viewpoint position P, light distribution curves J1 and J2 shown in FIG. 7B (J1 is a horizontal light distribution curve and J2 is a vertical light distribution). A lighting fixture L1 (vertical corner light) having a curved line is shown. Further, the coordinates of the viewpoint position P (X, Y, Z) = (1800 mm, 0 mm, 1250 mm), the position coordinates of the gazing point Q (X, Y, Z) = (1800 mm, 3600 mm, 1250 mm), and the field of view range. The region G within the viewing angle of the subject's viewpoint P from the viewing direction P1 in the upward direction θ1 = 35 °, the downward direction θ2 = 50 °, the rightward direction θ3 = 50 °, and the leftward direction θ4 = 50 °. A simulation result of “geometric mean luminance Bb” of region G was 6.0 [cd / m 2]. As described above, the “geometric mean brightness Bb” of the region G can be objectively calculated by a calculation simulation using the radiosity method based on the light distribution data of each lighting fixture.

  Then, the “brightness sensation index F” of the lighting fixture L1 is set to F = 1.5Bb0.7 = 5.3 [feu] based on the above [Equation 5]. “Brightness sensation index F” of an illumination space with little error due to individual subjectivity based on the “geometric mean luminance Bb” of the region G objectively calculated while maintaining the correlation with “color mode boundary luminance A” Can be easily obtained.

As explained so far, the evaluation value for evaluating the lighting environment of the space is “brightness sensation index F
"Can be used to properly evaluate the lighting environment of the space. Then, in order to measure such an evaluation value, that is, “brightness sensation index F” in an actual illumination environment (illumination space), “geometric mean luminance Ba, Bb” is obtained from the luminance distribution in the illumination space. Good.

  Thus, in the illumination environment measuring apparatus of the present embodiment, a still image (luminance distribution image) obtained by imaging a space (illumination space) by the imaging apparatus 1 fixed to a tripod is taken into the computer apparatus 2 and the luminance distribution image is imaged. By processing, the viewing angle P is set within the viewing angle of the viewing direction P1 from the subject's viewpoint position P1 in the upward direction θ1 = 35 °, the downward direction θ2 = 50 °, the leftward direction θ3 = 50 °, and the rightward direction θ4 = 50 °. The “geometric mean brightness Bb” of the specific area G1 is obtained, and “brightness sensation index F” is calculated based on the above [Equation 5], with F = 1.5Bb0.7.

Here, in order to image the specific region G within the viewing angles of the above-described upward direction θ1 = 35 °, downward direction θ2 = 50 °, leftward direction θ3 = 50 °, and rightward direction θ4 = 50 ° with the imaging device 1, It is necessary to use a fisheye lens as the lens 10. However, since the resolution of the fisheye lens is high at the center, but the resolution decreases toward the periphery, in order to increase the calculation accuracy of the “brightness sensation index F”, the luminance distribution image of the ellipse of the specific area captured by the fisheye lens is used. It needs to be converted to a rectangle. Therefore, when a fisheye lens is used as the lens 10, a program for converting the shape of the specific area G from an ellipse to a rectangle is installed in the computer device 2, and the specific area is obtained by executing the program on the image captured from the imaging device 1. Convert the shape of G from an ellipse to a rectangle. At this time, there are many points where brightness information (brightness value) does not exist just by converting the shape, and therefore there is no luminance value at all points in the specific region G converted into a rectangle. In such a case, a process of interpolating from the luminance values of neighboring points is performed. As a result, even when a fisheye lens is used, the evaluation value (brightness sense index F) can be easily measured. (Embodiment 1)
By measuring the brightness index (Feu value) described above, the lighting system is designed by numerically grasping the atmosphere of the entire space.

  First, an illumination system having an irradiation unit and a dimming control unit as shown in FIG. 12 will be described. The irradiating unit includes a wall surface irradiating unit 32 and a base irradiating unit 31, and the dimming control unit can select two setting modes, a normal mode and an energy saving mode. And the wall surface irradiation part 32 and the base irradiation part 31 can be installed like FIG. 13 as an example. FIG. 13 is a schematic view of installation of a lighting fixture in a space. In order to irradiate the entire space 30, the base irradiation unit 31 is arranged in a line at equal intervals. If the entire space 30 can be irradiated, it is not necessary to align in an unbroken line. Further, the wall surface irradiation unit 32 is installed so that the irradiation direction faces the wall surface in order to irradiate the wall surface. As an installation method, a holding device with the ceiling may be provided, a certain distance from the ceiling may be provided, or a method of directly embedding in the ceiling may be used. The wall surface irradiation unit 32 and the base irradiation unit 31 can be dimmed individually by the dimming control unit. In order to perform light control, a method of giving an instruction to a lighting fixture by operating a remote controller is considered.

In the lighting system shown in FIG. 12, when the energy saving mode is selected, the illuminance reduction width of the base irradiation unit 31 that illuminates the entire space 30 is larger than the illuminance reduction width of the wall surface irradiation unit 32. Creates a difference in illuminance. When the illuminance is lowered, the illuminance reduction width of the wall surface irradiation unit 32 may be zero. This is because, in order to exert the effect of the present invention, it is possible to exert the effect by making a difference in illuminance between the wall surface irradiation unit 32 and the base irradiation unit 31 and keeping the illuminance of the wall surface irradiation unit 32 high. That's why. In addition, the atmosphere of the whole space can be kept bright, so that the illumination intensity of the wall surface irradiation part 32 is kept high.
As a result of performing individual dimming as described above, even when the illuminance is lowered, the wall surface illuminance is higher than the illuminance of the entire space, visually maintaining the brightness of the entire space, and realizing an energy saving effect. ing. That is, the illumination system of the present embodiment is designed to keep the illuminance of the wall surface irradiation unit 32 higher than the illuminance of the base irradiation unit 31 when the energy saving mode is selected.

Here, the lighting fixture used for the base irradiation unit 31 may be a straight-tube fluorescent lamp, a lighting fixture using an LED, or an organic EL. Moreover, the lighting fixture used for the wall surface irradiation part 32 may be a lighting fixture using an LED or an incandescent lamp. However, if a more energy-saving effect is desired, it is more effective to use a lighting fixture using an LED with less power consumption. Can be expected.
(Embodiment 2)
As the lighting fixture used for the base irradiation unit 31 and the wall surface irradiation unit 32 shown in the first embodiment, a lighting fixture as shown in FIGS. 14 and 15 may be used. FIG. 14 shows a cross-sectional view of the lighting fixture 34, and FIG. 15 is a side view of the lighting fixture 34. The lighting fixture 34 includes a base irradiation unit 31 and a wall surface irradiation unit 32. In the base irradiation unit 31 and the wall surface irradiation unit 32 illustrated in FIG. 14, an LED or an organic EL may be used as a semiconductor light emitting element.

14 includes a base irradiation unit 31 and a wall surface irradiation unit 32. Further, the irradiation light of the wall surface irradiation unit 32 achieves the same effect as the wall surface irradiation unit 32 shown in FIG. 13 because the reflected light reaches the wall surface. That is, the functions of the base irradiation unit 31 and the wall surface irradiation unit 32 can be exhibited with one lighting fixture. That is, since one lighting fixture plays the role of two lighting fixtures, the energy saving effect can be exhibited more than the lighting system shown in the first embodiment. In the second embodiment, the wall surface irradiation unit 32 shown in the first embodiment may be used. By using the wall surface irradiation unit 32 together, the entire space can be kept brighter.
In addition, when the energy saving mode is selected, the illuminance of the base irradiating unit 31 is reduced, but by maintaining the illuminance of the wall surface irradiating unit 32, it is possible to reduce power consumption while maintaining the atmosphere of the entire space. . Note that, when the energy saving mode is selected, the decrease in illuminance of the wall surface irradiation unit 32 may be zero.
(Embodiment 3)
When any one of Embodiments 1 to 3 is used as a lighting system of the present invention at a commercial store or the like, it is possible to use a lighting system including an irradiating unit as an irradiation unit as shown in FIG. When using the priority irradiation part 37, it can install as shown in FIG. The priority irradiation unit 37 has an effect of changing the illuminance with the surroundings by irradiating a part, such as irradiating the sales product with priority, and making the sales product stand out from the consumer. The important point irradiation unit 37 is movable and can be installed at any place on the mounting rail 38. By moving the installation location, it is possible to irradiate sales merchandise from any point. In the energy saving mode, the power consumption can be suppressed by reducing the illuminance of the priority irradiation unit 37.
Further, the illuminance reduction width of the priority irradiation unit 37 in the energy saving mode is smaller than the illuminance reduction width of the base irradiation unit 31 and larger than the illuminance reduction width of the wall surface irradiation unit 32. Either one of the lowering widths may be 0, but it is necessary to keep the irradiance of the important point irradiation unit 37 higher than the illuminance of the base irradiation unit 31.

In addition, when there are many people coming and going, such as commercial stores, and when people can be expected to come and go with temporal periodicity, a lighting system having a timer unit as shown in FIG. 18 is effective. By providing a timer, set the energy saving mode to be selected automatically when the number of people going in and out is low, and the commute mode selected when the time is expected to be high. Can do. That is, by having the timer unit, it is not necessary to control artificially.
(Measurement experiment of Feu value effect)
As described above, various embodiments have been listed. Hereinafter, the energy saving effect when the energy saving mode is selected by the lighting system of the present invention will be described. The following numbers are the experimental measurement results at the experimental facility.

In this experiment, the power consumption is calculated and compared by measuring the Feu value and the illuminance when the lighting device is dimmed collectively (conventional lighting device) and when the lighting device is individually dimmed (present invention). The energy saving effect was confirmed. FIG. 19 is a layout view of devices and the like in the experiment. In this experiment, in order to suppress the light from other than the lighting fixtures such as reflection from the wall as much as possible, the dark curtain 43 was used to prevent reflection. And the impression of the atmosphere which the test subject 42 received when performing each light control, the Feu value, and the illuminance value in that case were measured using the Feu measuring machine 44 and the illuminometer 41, respectively. In this experiment, the illuminance of the entire space is gradually reduced, and when the subject 42 looks over the entire space, the illuminance is adjusted so that the atmosphere of the space does not collapse, and the illuminance and power consumption at that time are measured. To do.

  FIG. 21 shows a comparison between the Feu value at the time of dimming and the cumulative establishment of the subject 42 at each value. Here, by comparing the Feu values at a cumulative probability of 75%, the illuminance in the batch dimming and the individual dimming was compared. The power consumption was calculated by comparing the illuminance, and the energy saving effect was judged.

  First, as shown in FIG. 20, the Feu value in batch dimming was 22, the illuminance (desk surface) was 874 (lx), and the illuminance (wall surface) was 522 (lx). On the other hand, the Feu value in individual light control was 19, the illuminance (desk top surface) was 620 (lx), and the illuminance (wall surface) was 534 (lx). From this result, it can be seen that the Feu values at which the subject in both dimming methods does not destroy the atmosphere in the space do not match and are different. Correspondingly, the illuminance on the desk surface and wall surface is also changing.

  Since the illuminance in each case is different, the difference in power consumption was calculated from the difference in illuminance. The lighting fixture used for the experiment necessary for calculation will be described. First, the base irradiation unit is a straight tube fluorescent lamp Hf32W and has a total power of 1020w. About a wall surface irradiation part, it becomes a total electric power 365W using LED wall washer downlight 200 form. About a priority irradiation part, it is LED spotlight 35 form, and electric power total is 97W.

  Based on the information on the appliances used, the power consumption at each illuminance was examined. As a result, comparing the illuminance of both dimming on the desk surface and calculating the power consumption, it was confirmed that the power consumption in the individual dimming was 30% less than the power consumption in the batch dimming. On the other hand, when the illuminance of both dimming on the wall surface was compared and the power consumption was calculated, it was confirmed that the power consumption in the individual dimming was 3% higher than that in the batch dimming. When the power consumption is calculated by adding the desk surface illuminance and the wall surface illuminance, it was found that the power consumption in the individual dimming has an energy saving effect of 20% than the power consumption in the collective dimming.

  That is, it was found that individual dimming can exert an energy saving effect without destroying the atmosphere of the entire space, rather than dimming the entire space by batch dimming. From this, it can be seen that the illumination system described in each of the embodiments described above can effectively realize energy saving.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Computer apparatus 3 Communication cable 4 Illuminance meter 30 The whole space 31 Base irradiation part 32 Wall surface irradiation part 33 Feu measuring device 34 Lighting fixture 41 Illuminance meter 42 Subject 43 Dark curtain 44 Feu measuring machine

Claims (4)

An illumination system having an illumination unit that illuminates a space and a dimming control unit that performs dimming control of the illumination unit, wherein the illumination unit includes a wall surface illumination unit that illuminates a wall surface and a base illumination unit that illuminates the entire space. The dimming control unit can switch the irradiation unit between a normal mode and an energy saving mode, and the energy saving mode lowers the illuminance of the irradiation unit as compared with the normal mode, The illuminance reduction width is larger than the illuminance reduction width of the wall surface irradiation part ,
It has an important irradiation part to irradiate, and when the energy saving mode, the illuminance reduction width of the important irradiation part is
Less than the illuminance reduction width of the base irradiator and greater than the illuminance reduction width of the wall surface irradiator
Lighting system characterized by The illumination system according to claim 1, wherein a reduction amount of illuminance of the wall surface irradiation unit is 0 in the energy saving mode. The illumination system according to claim 1, further comprising a lighting fixture having a base irradiation unit and a wall surface irradiation unit. The lighting system according to claim 1, wherein the dimming control unit is a timer unit.
And switching between normal mode and energy-saving mode according to the result of the timer unit
Characteristic lighting system.