JP5133149B2 - Indoor lighting design method and lighting control system - Google Patents

Description

  The present invention relates to an indoor lighting design method and a lighting control system.

  Lighting equipment and lighting that achieves a lighting environment that matches the room's usage in a highly designed room mainly composed of indirect lighting with multiple lights in a room and wall lighting. As a conventional indoor lighting design method that allows a general user who does not have lighting expertise to easily select a combination of fixtures, the surface brightness changes using a light source that is different from the light source of the lighting fixture in an indoor lighting space. The color chart seen from the observer is between the level of brightness recognized as an object placed in the room and the level of brightness recognized as a light source that emits light. Based on the correlation with the color mode boundary luminance, which is the luminance of the color chart when an unnatural color appears, a “brightness sensation index” that represents the brightness of the lighting space Set up and install lighting fixtures individually Sum of the brightness feeling index that is, such that the brightness feeling index needed in the room, there is a method of combining luminaire (e.g., see Patent Document 1).

Moreover, in the above-mentioned Patent Document 1, when setting the brightness sensation unit, it is necessary to actually measure the color mode boundary luminance for each appliance using a test patch luminance presentation device in a room under standard conditions, which requires a lot of man-hours. In addition, since the measurement is based on individual senses, there is a risk that measurement errors due to blurring of the senses may increase, and in order to improve this problem, measured data of color mode boundary luminance under various conditions and each of the conditions Paying attention to the correlation with the physical quantity that can be obtained by the simulation below or the measurement by the equipment, the brightness sensation based on the color mode boundary luminance when a certain condition is set by the empirical formula derived from the correlation It has been possible to propose a method for defining an index (for example, see Patent Document 2).
JP 2006-269378 A JP 2007-171055 A

  However, the conventional brightness sensation index does not assume an illumination space in which a daylight incident window surface or the like exists. In general, when a high-luminance part with higher brightness than other areas such as a window surface is present in the room, the eyes adjust to the high-luminance part, so that the illumination space is larger than when there is no high-luminance part. The impression becomes darker. That is, the feeling of brightness in the illumination space that is felt with respect to the same brightness sensation index is reduced as compared with the case where there is no high luminance part. Conversely, when there is a low-luminance part in the room that has a lower brightness than other areas, the eyes adjust to the low-luminance part, so the impression of the lighting space is less than when there is no low-luminance part. It becomes brighter. That is, the feeling of brightness of the illumination space that is felt for the same brightness sensation index is increased as compared to the case where there is no low luminance part.

  Therefore, in an indoor lighting design method for designing indoor lighting based on a brightness sensation index that is affected by the presence of a high-luminance part or a low-luminance part such as a window surface, and an illumination control device that controls indoor lighting, A feeling of brightness could not be secured.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is indoors that can ensure appropriate brightness in consideration of adaptation to the eyes in an illumination space where a high-luminance portion or a low-luminance portion exists. An object of the present invention is to provide an illumination design method and an illumination control system.

  According to the first aspect of the present invention, a color chart in which the luminance of the surface changes using a light source different from the light source of the luminaire in the indoor illumination space is provided in the room, and the color chart viewed from the observer is in the room. Color mode boundary, which is the brightness of the color chart when an unnatural color is seen, which is halfway between the brightness level recognized as a placed object and the brightness level recognized as a light source that emits light Based on the correlation with the brightness, a brightness sensation index that expresses the brightness of the lighting space is specified, and it is applied to a high-luminance part that has higher brightness than other areas of the lighting space, or to other areas of the lighting space. The same brightness sensation that occurs when the observer's eyes adapt to the high-brightness or low-brightness part in an illumination space where the low-brightness part has a lower brightness than the indoor and outdoor windows. Change in brightness of the lighting space evaluated by the observer for the indicator , Corrected brightness sensation corrected based on a prediction formula that shows the relationship between the brightness sensation index corresponding to the brightness of the window surface and the brightness evaluation of the lighting space by the observer for each combination of window position and scenery outside the window An index is defined, and indoor lighting is designed using a corrected brightness sense index.

  According to the present invention, it is possible to design indoor lighting that secures an appropriate brightness feeling in consideration of adaptation to the eyes in an illumination space in which a high-luminance part or a low-luminance part exists. Comfort can be improved.

  The invention of claim 2 includes a lighting fixture that illuminates an indoor lighting space, and a color chart in which the luminance of the surface changes using a light source different from the light source of the lighting fixture in the indoor lighting space, in the room, The color chart seen by the observer looks like an unnatural color that is intermediate between the luminance level recognized as an object placed in the room and the luminance level recognized as a light source that emits light. Brightness sensation index measuring means for measuring a brightness sensation index representing the brightness sensation of the illumination space based on the correlation with the color mode boundary luminance, which is the luminance of the color chart, and other areas in the illumination space A high-brightness part or a low-brightness part in an illumination space where a high-brightness part with higher brightness or a lower-brightness part with lower brightness than other areas in the illumination space exists on the window surface between indoor and outdoor The same as the eyes of the observer The change in the brightness of the lighting space evaluated by the observer with respect to the Russian sensation index, and the relationship between the brightness sensation index according to the brightness of the window and the evaluation of the brightness of the lighting space by the observer Brightness sensation index correction means for deriving a corrected brightness sensation index corrected based on the prediction formula shown for each combination of the scenery outside the window, and dimming the lighting fixture so that the corrected brightness sensation index becomes a target value And a control means for controlling.

  According to the present invention, it is possible to perform dimming control that secures an appropriate brightness feeling in consideration of adaptation to the eyes in an illumination space in which a high-luminance part or a low-luminance part exists, and a resident in an indoor illumination space Comfort can be improved.

  According to a third aspect of the present invention, there is provided the light shielding device according to the second aspect, wherein the area and position of the window surface in the illumination space are variable, and the control means is configured so that the corrected brightness sense index becomes a predetermined value. The dimming of the lighting fixture and the operation of the light shielding device for the window surface are controlled in conjunction with each other.

  According to this invention, the dimming range is widened by interlockingly controlling the dimming of the lighting fixture and the operation of the light shielding device.

  As described above, according to the present invention, it is possible to ensure an appropriate brightness feeling in consideration of adaptation to the eyes in an illumination space where a high-luminance part or a low-luminance part exists, There is an effect that it is possible to provide an indoor lighting design method capable of improving comfort and a lighting control system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
In this embodiment, when a lighting fixture is to be installed in an indoor space, an indoor lighting design for determining what type of lighting fixture needs to be installed in order to achieve the required brightness and atmosphere. It is about the method.

  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-recognized visual space (Reference 1: Evaluation of the sense of brightness in the real environment by measuring the brightness size of the illumination-recognized visual space; Magazine, 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.

  It has also been shown that color mode boundary luminance additivity holds in non-uniform lighting environments (Reference 2: Additivity of spatial brightness in non-uniform lighting environments, 36th National Congress of the Illuminating Society of Japan) Proceedings, P154, 2003, Yamaguchi et al.) When a certain lighting environment K1 is the sum of the lighting environments K2 and K3, the color in 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 mode boundary luminance 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 the color mode boundary luminance setting, the test patch luminance presentation device 1 shown in FIG. 2 is used. The test patch luminance presentation device 1 includes a light source box 1a that houses a light source system 1b that is a slide projector using a halogen light bulb as a light source, and an optical box that houses a rotational density filter 1d. 1c, a movable flat mirror 1e, and a test patch T provided at a height of 1100 mm from the installation plate 1a by a support 1f. The test patch T is locally illuminated by the light passing through the rotational density filter 1d from the light source system 1b reflected by the movable plane mirror 1e. The observer can freely adjust the brightness of the test patch T by rotating the rotational density filter 1d 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” of the test patch T measured by operating the test patch luminance presentation device 1, a “brightness sensation index F ′” is derived based on the following [Equation 1]. The unit of “color mode boundary luminance A” is [cd / m ² ].

  The outline of the indoor lighting design method using the “brightness sensation index F ′” defined based on the correlation with the “color mode boundary luminance A” will be described below.

  First, as shown in FIG. 3, an 8-tatami real-sized residential room Ra having a room size of 3500 mm × 3500 mm and a ceiling height of 2500 mm is prepared as a measurement environment under standard conditions, and the three surfaces of the ceiling and the wall are finished with a white cloth. One side of the wall is partitioned by a white roll screen 2 and 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 1 shown in FIG. 2, the “color mode boundary luminances A1 to An” when various lighting fixtures L1 to Ln are individually arranged in the residential room Ra are measured, and the above [ Based on Equation 1, the individual “brightness sensation indicators F1 ′ to Fn ′” of the lighting fixtures L1 to Ln are calculated.

  Next, a lighting fixture Lr (dashed line in FIG. 3), which is a ceiling-mounted ceiling light with a milky white 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 according to the subjective evaluation of the observer. From “Equation 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 luminaires arranged at each installation position is “the required brightness sensation index Fr ′”. The lighting fixture is selected from the lighting fixtures L1 to Ln. For example, when the lighting fixtures L10, L15, and Ln are selected and the brightness sense indexes F10 ′, F15 ′, and Fn ′ of the respective lighting fixtures are set, Fr ′ = [F10 ′ + F15 ′ + Fn ′] may be satisfied.

  In this way, by defining the “brightness sensation index F ′” based on the correlation with the “color mode boundary luminance A”, for a room in which the “required brightness sensation index Fr ′” is set. If the lighting fixtures are combined so that the “sum of brightness sensation indicators” of each lighting fixture becomes the “required brightness sensation indicator Fr ′” of the room, indirect lighting and wall lighting with a plurality of lamps in one room can be performed. Even in the main room, it is possible to realize a lighting environment having a required brightness according to the use of the room in consideration of the room conditions.

  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, correlation between the measured data of “color mode boundary luminance A” under various conditions and “geometric mean luminance” excluding the light source luminance of a specific area of the illumination space within the observer's field of view under the various conditions. A method of defining “brightness sensation index F ′” when a certain condition is set based on an empirical formula derived from the correlation will be described below.

  First, in the residential room Ra shown in FIG. 3, an approximate center on the back wall Ra1 side facing the roll screen 2 on the right hand is set as the observer's viewpoint position P. And in the indoor lighting design method of this embodiment, as shown to Fig.4 (a) (b), based on the range of a human's effective visual field, it is upward from the test subject's viewpoint position P with respect to the gaze direction P1. A region G within a viewing angle of θ1 = 35 °, a downward direction θ2 = 50 °, a leftward direction θ3 = 50 °, and a rightward direction θ4 = 50 ° is set, and the “geometric mean luminance B” in the region G is set for each illumination. It calculates from the light distribution data of the appliances L1, L2, and L3 by calculation simulation using the radiosity method.

  In the residential room Ra shown in FIG. 3, the region G when looking at the approximate center of the front wall Ra <b> 2 from the viewpoint position P of the subject is a three-dimensional region as shown in FIG. 5.

  The lighting fixtures used are three lighting fixtures L1, L2, and L3 of the indirect illumination system that are arranged so that the light source cannot be seen by the observer. As the lighting fixture L1, a vertical corner light is arranged in the vicinity of the right corner of the front wall Ra2 facing the observer's viewpoint position P. As the lighting fixture L2, a floor-mounted horizon light is arranged in the vicinity of the left corner of the front wall Ra2. As lighting fixture L3, a floor stand is arrange | positioned in the left corner vicinity of back wall Ra1. In addition, each of these lighting fixtures L1, L2, and L3 can be dimmed by the dimmer 3 arranged at the hand of the observer.

  First, the test patch luminance presentation device 1 is installed so that the test patch T is located 2500 mm from the rear wall Ra1, and the “color mode boundary luminances A1, A2, A3 when the lighting fixtures L1, L2, L3 are lit alone are installed. 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 “illuminance”.

Further, under the above-mentioned plurality of conditions, the value of “geometric mean luminance B” of the region G was calculated from the light distribution data of each of the lighting fixtures L1, L2, and L3 by calculation simulation using the radiosity method. Here, the value of each “geometric mean luminance B” of the lighting fixtures L1, L2, and L3 in the region G is “geometric mean luminance B1, B2, and B3”. The unit of “geometric mean luminance B” is [cd / m ² ].

  6A, 6B, and 6C are tables showing the measurement results of the “color mode boundary luminances A1, A2, and A3” and the simulation results of “geometric average luminances B1, B2, and B3” of the region G. FIG. 6 (a) shows the result when the lighting fixture L1 is turned on alone, FIG. 6 (b) shows the result when the lighting fixture L2 is turned on alone, and FIG. 6 (c) shows that the lighting fixture L3 is turned on alone. Each case result is shown.

  The reflectance of the interior surface of the experimental equipment is actually measured, and the reflectance of the interior surface of the residential room Ra used for the simulation is 79% for the ceiling and 81% for the wall. The reflectance of the floor is 9.8%, and the reflectance of the roll screen 2 is 68%.

  FIG. 7 shows “geometric mean luminance B” of region G on the logarithmic scale on the horizontal axis and “color mode boundary luminance A” on the logarithmic scale on the vertical axis. Relationship between average value of measurement result of “color mode boundary luminance A1, A2, A3” and simulation result of “geometric average luminance B1, B2, B3” of region G under various conditions with different “floor center illumination” Is shown in a graph.

  A straight line 51 in FIG. 7 is a straight line obtained by linear regression with respect to all plot points, and as a result of 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 B” of the region G, and the “color mode boundary luminance A” and the “geometric average luminance B of the region G”. ] Is expressed by the following [Equation 2]. Therefore, the “color mode boundary luminance A” can be estimated from the “geometric mean luminance B” of the region G.

  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].

  As described above, the correlation between the “color mode boundary luminance A” and the “geometric mean luminance B” of the region G (see [Expression 2] above), the “brightness sense index F ′”, and the “color mode boundary luminance”. Based on the correlation with “A” (see [Expression 1] above), the “brightness sensation index F ′” can be defined as a function of the “geometric mean luminance B” of the region G (see above [ (See Equation 3]).

  A specific example will be described below. The room size: 3600 mm × 3600 mm and the ceiling height: 2500 mm shown in FIG. 8 is set as a standard condition room, and the lighting fixture L1 (vertical corner light) faces the subject's viewpoint position P. Place near the right corner.

  Then, when setting the “brightness sensation index F ′” for each lighting fixture for this lighting fixture L1, first, the “geometric mean luminance B” of the region G 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 residential room Ra shown in FIG. 8, the size of the residential 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. And lighting fixture L1 (vertical corner light) which has a predetermined light beam, light distribution data, etc. is arrange | positioned in the right-corner vicinity of front wall Ra2 facing a test subject's viewpoint position P. FIG. 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 B” of the region G was 6.0 [cd / m ² ]. As described above, the “geometric mean brightness B” 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.

The “brightness sensation index F ′” of the lighting fixture L1 is set to F ′ = 1.5B ^0.7 = 5.3 based on the above [Equation 3], and “brightness sensation index F ′” is set. And “color mode boundary luminance A” while maintaining the correlation between the “color mode boundary luminance A” and the “brightness sensation index F” of the illumination space with less error due to the subjectivity of the individual based on the “geometric mean luminance B” of the region G that is objectively calculated You can get '"easily.

  In addition, since the “geometric mean luminance B” 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.

  Even in a room mainly composed of indirect lighting or wall lighting with multiple lamps in a room, the value of the “brightness sensation index F ′” of each lighting fixture described in the catalog, etc., in consideration of the room conditions By performing addition based on the above, even a general user who does not have specialized knowledge can easily determine a combination of lighting fixtures that realizes a lighting environment with a required brightness.

  However, the method of defining the “brightness sensation index F ′” as described above is higher than that of a high-luminance part having a higher luminance than other regions, such as a window surface on which daylight is incident, or other regions. An illumination space in which a low-luminance part with low luminance exists is not assumed. In general, when a high-brightness part having higher brightness than other areas is present in the room, the eyes adapt to the high-brightness part, so the impression of the illumination space is darker than when there is no high-brightness part. That is, the feeling of brightness in the illumination space that is felt with respect to the same brightness sensation index is reduced as compared with the case where there is no high luminance part. Conversely, when there is a low-luminance part in the room that has a lower brightness than other areas, the eyes adjust to the low-luminance part, so the impression of the lighting space is less than when there is no low-luminance part. It becomes brighter. That is, the feeling of brightness of the illumination space that is felt for the same brightness sensation index is increased as compared to the case where there is no low luminance part.

  Therefore, in the present invention, the “brightness sensation index F ′” is corrected in order to eliminate the influence of the high luminance part and the low luminance part in the room.

  First, for the purpose of obtaining a subjective brightness evaluation of a room with a window for various outdoor brightness, while the outdoor brightness changes momentarily in the daytime, night and evening, A subjective evaluation experiment was conducted in which the subject was evaluated for indoor brightness by setting the position and type of scenery and the output of indoor lighting.

  The room is made of glass on both sides of the east (outdoor view is residential) and north (outside view is green wood), and the roll screen installed on the indoor side shields the glass surface appropriately. This is a W5.0m × D5.0m × H2.4m laboratory where the position and size of the window can be changed and the position and size of the window can be set arbitrarily. The ceiling shows the entire ceiling surface to the light source. It consists of a light ceiling, flooring, and white cloth.

  And the position of the window provided in the room (window condition) is “the window is located on the entire surface of the observer's facing wall (window condition: M1)”, “longitudinal length of 1/3 of the room width and the same dimension as the room height. “The window is located in the center of the opposing wall (window condition: M2)”, “A horizontal window with the same dimension as the room height and 1/3 of the room width is located in the center of the opposing wall (window condition: M3)”, “Opposite The window was positioned at the upper 2/3 of the wall (window condition: M4) ”.

  The type of scenery that can be seen from the window (scenery conditions) is “housing” when the east side is the opposing wall, “green” when the north side is the opposing wall, and when the east side is the opposing wall ( That is, when the scenery condition is “house”), the window position is the above-described window conditions M1 to M4, and when the north surface is the facing wall (that is, when the scenery condition is “green”), the window position is Was set as the window conditions M1 and M2 described above.

  Also, in the room, the entire surface of the optical ceiling always emits light, and other artificial lighting is installed in addition to this optical ceiling. As lighting conditions, the daytime and nighttime are “artificial lighting only and the floor surface central illumination is 300 lx. In the evening, further “turn off artificial lighting”, “set floor center illumination to 3% of window vertical illumination”, “floor center illumination to 10% of window vertical illumination A total of 5 conditions including 4 conditions of “setting” and “setting the floor center illumination to 30% of the window vertical illumination” were provided.

  There were five observers, and they sat in the room under the conditions (hereinafter referred to as “environmental conditions”) that set the window conditions, scenery conditions, and illumination conditions, and opened their eyes, and adapted to these environmental conditions for 3 minutes. Later, the room brightness was evaluated. Each observer conducts a brightness evaluation, and after all the observers have completed the brightness evaluation, the environmental conditions are changed, and while the environmental conditions are changed, the test subjects close their eyes and wait for a series of tasks. After setting the following environmental conditions, this series of operations was repeated. In the experiment of the daylight changing every moment in the evening, the brightness evaluation under all lighting conditions (5 conditions) in three stages with different outdoor brightness for two combinations of scenery conditions and window conditions on the same day Got. The experiment was conducted over a plurality of days, and brightness evaluation data was obtained three times per observer under the same environmental conditions.

  Then, simultaneously with the subjective evaluation of the brightness of each observer under each environmental condition, the window surface vertical surface illuminance, the observer's frontal vertical surface illuminance, and the luminance distribution in the observer's visual field are measured. From the luminance distribution in the observer's field of view, the geometric average luminance of the window surface and the geometric average luminance in the region G (“geometric average luminance B” in [Expression 3] above) are obtained. From “Equation 3”, “brightness sensation index F ′” is derived.

  As an example of the experimental results, FIG. 9 shows the relationship between the “brightness sensation index F ′” and the indoor brightness evaluation in the window condition “M1” and the scenery condition “house”. From this experimental result, it is clear that the indoor brightness evaluation is influenced by the geometric average brightness of the window surface (= the brightness of the scenery outside the window), and “brightness sensation index F ′” and “ It was found that the relationship with "brightness evaluation" depends on the brightness outside the window.

  The relationship between “brightness sensation index F ′” influenced by the brightness outside the window and “categorical evaluation of indoor brightness by the observer” is indicated by prediction curves Y1 to Y10 in FIG. Y2,. . . , Y9, and Y10, the window surface geometric average brightness increases, and the higher the window surface geometric average brightness, the lower the evaluation of the brightness even with the same brightness sensation index F ′. The lower the is, the higher the evaluation of the brightness is even with the same brightness sense index F ′. These prediction curves Y1 to Y10 are prediction formulas for predicting “indoor brightness evaluation by an observer” using a brightness sense index and window surface geometric mean luminance as variables for each combination of window position and scenery type. Can be shown as

  Regarding the correspondence between the brightness sensation index and the categorical evaluation of indoor brightness, in a state where there is no significant change in the brightness distribution in the room, as represented by a standard interior room with no general lighting, From the past experimental data, it is clear that a high correlation is established. Therefore, in a room with a window, the brightness sensation index and the indoor brightness categorical obtained in a state where the brightness of the room and the brightness of the window surface are almost equal, that is, the brightness distribution in the room is not significantly changed. The correspondence with the evaluation is set as the reference state.

  For example, under the condition that the geometric average luminance of the window surface and the geometric average luminance of the region G are almost equal, the ratio of the geometric average luminance of the window surface and the geometric average luminance of the region G is in the range of 2/3 to 3/2. In this case, the correspondence between the brightness sensation index in the reference state and the categorical evaluation of the room brightness is the relationship indicated by the reference curve Ya in FIG. This relationship can be expressed as a function with only the brightness sense index as a variable.

  Next, as a method for calculating the corrected brightness sensation index F in which the brightness sensation index F ′ is corrected in consideration of the influence of the window surface geometric average brightness (the brightness of the scenery outside the window), first, the above-described measurement is performed. Using one of the above prediction formulas (prediction curves Y1 to Y10) in consideration of the influence of scenery and window surface brightness based on the brightness sense index F ′ measured by the method and the window surface geometric average brightness at the time of measurement. Predict the brightness of the room. Then, in the reference state (reference curve Ya in FIG. 9), the value of the brightness sensation index from which the predicted evaluation is obtained is used as the corrected brightness sensation index F. While maintaining the relationship with the brightness evaluation of the room, the brightness of the room affected by the geometric average luminance of the window surface can be indicated by a brightness sense index.

  FIG. 9 exemplifies the relationship between the brightness sensation index and the room brightness in the window condition “M1” and the scenery condition “house” in accordance with the change in the geometric average luminance of the window surface. In each prediction formula showing the curves Y1 to Y10, by changing only one coefficient included in each prediction formula, the same prediction curves Y1 to Y10 can be obtained even in other window conditions and scenery conditions. In other words, by obtaining the above coefficients for each combination of typical window conditions and scenery conditions, the brightness sensation index and the observer taking into account the influence of the window surface geometric mean luminance corresponding to each window condition and scenery condition It is possible to define the relationship (prediction curves Y1 to Y10) with the indoor brightness evaluation by the measured brightness sense index F ′, the window surface geometric mean luminance at the time of measurement, and the prediction curves Y1 to Y10. From the reference curve Ya, the corrected brightness sensation index F for each combination of window conditions and scenery conditions can be obtained as described above.

  The “corrected brightness sensation index F” obtained in this way is corrected for the effect of the eyes adapting to the presence of the high-luminance part or the low-luminance part, and this “corrected brightness sensation index F” is used. By designing indoor lighting, it is possible to design indoor lighting that secures appropriate brightness in consideration of adaptation to the eyes in lighting spaces where there are high-luminance parts or low-luminance parts. The comfort of the occupants can be improved.

  The indoor lighting design method of the present invention described above is shown in the flowchart of FIG. 1, and first, the brightness sense index F based on the correlation with the color mode boundary luminance A according to the above [Equation 1] or [Equation 3]. (Step S1), and observation is performed for the same brightness sensation index by the observer's eyes adapting to the high-luminance part or the low-luminance part in the illumination space where the high-luminance part or the low-luminance part exists The amount of change (decrease or increase) in the lighting space sensed by the viewer, and the relationship between the brightness sense index corresponding to the brightness of the window surface and the brightness evaluation of the lighting space by the observer, and the window position A corrected brightness sensation index F corrected based on a prediction formula shown for each combination of scenery outside the window is defined (step S2), and indoor lighting is designed using the corrected brightness sensation index F (step S3). Performed in the procedure.

  Note that the “required brightness sensation index Fr after correction” can be obtained by correcting the “required brightness sensation index Fr ′” in the same manner.

(Embodiment 2)
In the present embodiment, a lighting control system that performs dimming control of a lighting fixture using the “corrected brightness sensation index F” described in the first embodiment will be described.

  First, FIG. 10 shows the configuration of the illumination control system, and the lighting fixture La that illuminates the illumination space of the room Rb in which external light enters from the window W and the lighting power supplied to the lighting fixture La are dimmed and controlled. The control unit 10 includes a brightness sensation index measurement unit 11 that measures “brightness sensation index F ′”, and a brightness sensation index correction unit 12 that derives “corrected brightness sensation index F”.

  As shown in FIG. 11, the brightness sensation index measurement unit 11 includes a CCD camera 11a, a luminance distribution measurement unit 11b, a geometric average luminance calculation unit 11c, and a brightness sensation index calculation unit 11d. First, the imaging range of the CCD camera 11a is set to be approximately the same as the visual field of the observer, and the image of the wall surface Rb1 provided with the window W is captured by the CCD camera 11a. The luminance distribution measuring unit 11b The geometrical average luminance calculation unit 11c calculates the “geometric average luminance B” in the region G based on the luminance distribution, and the brightness sensation index calculation unit 11d “Brightness sensation index F ′” is calculated from “geometric mean luminance B” according to the above [Equation 3].

  As shown in FIG. 11, the brightness sensation index correction unit 12 includes a window surface luminance calculation unit 12a that calculates the window surface geometric average luminance of the window W from the luminance distribution data measured by the luminance distribution measurement unit 11b, and a corrected brightness. And a sense index calculation unit 12b. Then, the corrected brightness sensation index calculation unit 12b is preset for each combination of the window condition and the scenery condition based on the window surface geometric average luminance calculated by the window surface luminance calculation unit 12a. A prediction formula (any one of the prediction curves Y1 to Y10) for predicting “indoor brightness evaluation by an observer” is selected using the geometric average luminance as a variable, and the selected prediction formula, the reference curve Ya, and the measured brightness From the sensory index F ′, the “corrected brightness sensory index” is calculated by the method of the first embodiment.

  The control unit 10 performs dimming control on the illumination device La so that the above-described “corrected brightness sensation index F” matches a preset target value, so that the outside light incident through the window W is controlled. The light can be adjusted to an appropriate brightness with the influence taken into account. In other words, dimming control that ensures appropriate brightness can be performed in consideration of the adaptation of the eyes in an illumination space where there is a high-luminance or low-luminance location such as a window surface. The comfort of the occupants can be improved.

  Further, as shown by a broken line in FIG. 11, a light shielding device 14 that makes the window opening condition variable by opening and closing the light shielding means 15 such as a blind or a roll screen is provided. If the lighting device La is dimmed and controlled so that the index “F” matches the target value, and the operation of the light shielding device 14 is also controlled in conjunction, the dimming range is expanded. In this case, the opening condition of the window varies depending on the operation of the light shielding device 14, but the brightness sensation index correction unit 12 sequentially acquires the operation state of the light shielding device 14 and is appropriate for the operation state of the light shielding device 14. The “corrected brightness sensation index F” is calculated.

It is a figure which shows the flowchart of the indoor lighting design method of Embodiment 1. FIG. It is a figure which shows the structure of a test patch brightness | luminance presentation apparatus same as the above. It is a figure which shows experimental equipment same as the above. (A) (b) It is a top view which shows the area | region which calculates geometric average brightness | luminance same as the above. It is the figure which looked at the 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 figure which shows a residence room same as the above. It is a figure which shows the relationship between an indoor brightness sensation parameter | index and brightness evaluation. It is a figure which shows the structure of the illumination control system of Embodiment 2. FIG. It is a figure which shows the one part detailed structure same as the above.

Explanation of symbols

A Color mode boundary luminance F 'Brightness sense index F Corrected brightness sense index

Claims (3)

In the indoor lighting space, a color chart that changes the brightness of the surface is provided in the room using a light source that is different from the light source of the luminaire, and the color chart viewed by the observer is recognized as an object placed in the room. Based on the correlation between the color mode boundary luminance, which is the luminance of the color chart when it looks like an unnatural color that is intermediate between the luminance level that is recognized as the light source that emits light Prescribing a brightness sensation index that represents the brightness of the lighting space,
In an illumination space where there is a high-brightness part that has higher brightness than other areas in the illumination space or a low-brightness part that has lower brightness than other areas in the illumination space on the window surface between indoor and outdoor Depending on the brightness of the window surface, the change in the brightness of the lighting space evaluated by the observer with respect to the same brightness sensation index caused by the observer's eyes adapting to the high-luminance part or low-luminance part A corrected brightness sensation index that is corrected based on a prediction formula that shows the relationship between the brightness sensation index and the brightness evaluation of the lighting space by the observer for each combination of window position and scenery outside the window,
An indoor lighting design method characterized by designing indoor lighting using a corrected brightness sense index. A lighting fixture that illuminates an indoor lighting space;
In the indoor lighting space, a color chart that changes the brightness of the surface is provided in the room using a light source that is different from the light source of the luminaire, and the color chart viewed by the observer is recognized as an object placed in the room. Based on the correlation between the color mode boundary luminance, which is the luminance of the color chart when it looks like an unnatural color that is intermediate between the luminance level that is recognized as the light source that emits light A brightness sensation index measuring means for measuring a brightness sensation index representing the brightness of the lighting space,
In an illumination space where a high-intensity part with higher brightness than other areas in the illumination space or a low-intensity part with lower brightness than other areas in the illumination space exists on the window surface between indoor and outdoor Depending on the brightness of the window surface, the change in the brightness of the lighting space evaluated by the observer with respect to the same brightness sensation index caused by the observer's eyes adapting to the high-luminance part or low-luminance part Brightness sensation that derives a corrected brightness sensation index based on a prediction formula that shows the relationship between the measured brightness sensation index and the brightness evaluation of the lighting space by the observer for each combination of window position and scenery outside the window Index correction means;
And a control means for dimming the lighting fixture so that the corrected brightness sensation index becomes a target value. Comprising a light-shielding device capable of varying the area and position of the window surface in the illumination space;
3. The illumination control system according to claim 2, wherein the control unit controls the dimming of the lighting fixture and the operation of the light shielding device on the window surface in an interlocking manner so that the corrected brightness sense index becomes a predetermined value. .

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