JP2015204177A - Lighting device for entire lighting having roof light window integrated with lighting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems found in the prior art that although a light diffusion type roof light window that is substantially contributable against energy saving due to direct utilization of solar light needs a mounting of lighting unit as an auxiliary light source and it was difficult to arrange or control it due to an appropriate intensity of illumination or uniformity ratio of illuminance, and although a regular maintenance management was essential for the lighting unit, in the case of large-scale and high ceiling buildings such as gymnasium, factory and warehouse or the like, it was necessary to make countermeasures such as installation of temporary scaffolds for maintenance management, installation of a catwalk for maintenance management and installation of an electric lifter device and the like.SOLUTION: This invention relates to a lighting device comprised of a light diffusion type roof light window in which an upper netted glass can be removed and its maintenance management can be carried out from a roof light window, and a lighting unit mounted just below the window and a lighting system using the lighting device.

Description

The present invention relates to a lighting device including a light diffusing skylight that can be maintained and managed from a roof by removing an upper meshed glass, and a lighting device that is disposed immediately below the lighting device, and an arrangement method thereof.

Large-scale buildings such as gymnasiums, factories, and warehouses are often made of steel frames, and often have folded-plate roofs. Origami roofs have a track record of over 30 million square meters per year in Japan, and around 20% of the roofs are folded.

Large buildings such as gymnasiums, factories, and warehouses generally have high ceilings and lighting fixtures are usually installed at high locations. In the maintenance and management of lighting equipment, it is necessary to replace the light bulb every several thousand hours, that is, every two to three years, to replace the lighting fixture body every 15 years after installation, and to replace the electrical wiring every 20 to 30 years. . In the case of LED lighting fixtures, bulb replacement is not necessary, but fixture replacement every tens of thousands of hours and wiring replacement every 20 to 30 years is necessary.

Some light-diffusing skylights are specialized for folding plates. The connection hardware with the folding plate roof is made by local roll molding, so that there is no break, and the glass is installed by using a gasket, so there is no break, so that a light diffusion type skylight with low risk of water leakage can be installed relatively inexpensively It has become.

Light diffusing skylights have been developed for lighting simulations and have been used as general lighting in factories and warehouses. Since the illuminance cannot be obtained with a light-diffusing skylight on bad days, morning and evening, or at night, it is necessary to prepare a separate lighting fixture as an aid.

Patent Publication Showa 62-139202 Skylight Device Patent Publication Hei 1-186501 Indoor Lighting System Patent Publication Heisei 3-241603 Interior lighting system Patent Publication Heisei 6-116610 Solar Daylighting Device Patent Publication 2010-160975 Indoor Lighting Device Full text of utility model Showa 59-0222827 Skylight device Full text of utility model Showa 61-194909 Indoor lighting system

Many techniques combining a skylight or daylighting device and a lighting fixture have been proposed.
For example, in patent document 1 patent publication Showa 62-139202 skylight device, since sunlight and an artificial light source are taken in indoors using a mirror or a half mirror, much energy is wasted by transmission loss and reflection. Moreover, since it can be installed only on a roof with a large slope, it is difficult to use as general lighting in a large space.

Patent Document 2 Patent Publication 1991-186501 An indoor lighting system includes a lighting part, a mirror for tracking sunlight, and a dimming louver. However, by having a solar light tracking system, there is a distance between the daylighting portion and the louver, and the cost is inevitable due to the size and complexity of the device. This is difficult to adopt as general lighting in large spaces.

Patent Document 3 Patent Publication No. Hei 3-241603 In an interior lighting system, a skylight, glass provided on a ceiling surface, polarizing glass, and an artificial light source provided therein provide illumination with high performance regardless of day or night. Since the artificial light source is provided inside the glass or polarizing glass, energy loss is large, the device is complicated, and it is difficult to adopt it as general illumination in a large space.

Patent Document 4 Patent Publication Heisei 6-116610 A solar lighting device is composed of a light irradiation unit composed of a daylighting unit and a light duct and an artificial light source provided in the light irradiation unit, and stores a solar cell as a power source for the artificial light source It is. However, since the artificial light source is in the middle of the light irradiation unit and illuminates the room through the half mirror, the energy efficiency is low. In addition, it is difficult to adopt as general lighting in a large space due to the complexity of the device.

Patent Document 5 Patent Publication 2010-160975 An indoor lighting device includes a skylight that is a daylight illuminator and an artificial illuminator that is an artificial light source, and is controlled by an illuminance sensor, and has general illumination conditions. However, since there is no mechanism to arrange skylights and lighting fixtures in an integrated manner, in normal construction work, the skylights that are handled as joinery or roof construction and the lighting fixtures that are handled as electrical equipment differ between designers and installers. It is difficult to secure the sex. Further, when the room is divided and used in the future, an inferior illuminance may occur depending on the wall position.
Moreover, although the output of a lighting fixture is controlled from the illumination intensity obtained with a skylight, since it cannot be confirmed that it is the optimal skylight arrangement in the first place, it is nothing but the next best measure.

Patent Document 6 Full Text of Utility Model Showa 59-0222827 The skylight device is characterized in that the light from the skylight is sent far away, and the directivity of light is enhanced. Due to the directivity of the light, it is necessary to increase the number of installations in order to use it as general lighting, which is difficult to implement in terms of cost.

Patent Document 7 Full Text of Utility Model Showa 61-194909 In an indoor lighting device, sunlight and artificial light sources are used to reduce energy contrast by reducing the illuminance contrast at the window in the daytime and in the center of the room. However, the amount of light obtained through the optical fiber is small and it is difficult to adopt as general illumination in a large space.

When maintaining and managing lighting fixtures installed in a large-scale building with a high ceiling, a method using an aerial work vehicle, a method using a scaffolding, a method using a catwalk provided in advance on the ceiling, bulb replacement, There is a method of providing a lifting device for exchanging instruments.

Construction using an aerial work platform is relatively inexpensive and can be carried out in a short time, but it becomes an obstacle to work under lighting equipment such as factory production machines and warehouse products when the floor is not flat. Not available when things cannot move. The method of constructing with scaffolding is expensive, and the total work time becomes excessive. Scaffolding can be used when the floor is not flat or when obstacles cannot be moved, but this will increase the cost and extend the construction period.

The method of providing a catwalk in advance on the ceiling enables maintenance work in the shortest time. However, it is the most expensive method because the structure of the catwalk must be designed in addition to the roof load.

Although the method of providing the lifting device is an inexpensive method, the electric device used for the lifting device operates stably by frequently operating it, but conversely, it tends to become unstable when the usage frequency is low. is there. On the other hand, lighting fixtures have a longer life and maintenance intervals are longer. As a result, the lifting device is used less frequently and may not operate when the lifting device is required for maintenance of lighting fixtures, resulting in inconsistent results, such as frequent maintenance work for the lifting device. ing. Also, it cannot be adopted when an obstacle cannot move. Moreover, the lifting / lowering device cannot handle wiring replacement.

By aligning the arrangement of light diffusing skylights and luminaires, maintenance of the luminaires can be done from the roof, and by combining the appropriate optical characteristics, it is easy to arrange the luminaires Can be determined.

The light diffusion type skylight to which the glass is attached by the gasket can be easily removed. Therefore, luminaires and electric piping are carried out from the opening of the light diffusion type skylight. Similarly, in order to carry out maintenance of the luminaire from the roof, a marker is attached to the light diffusion plate so that the position of the luminaire can be seen through the glass. Glass can be handled safely by using a suction cup. Install a handle so that the light diffusion plate does not fall to the bottom. Moreover, both the effects can also be acquired by coloring the handle.

In order to maintain the same orientation and angle as before when the luminaire is removed and re-installed, the mounting hardware consists of a part fixed to the steel frame and a part to be removed, both of which are fixed by a knob nut that can be turned by hand Do

Appropriate arrangement is optimized by simulating the power consumption obtained by the light diffusion type skylight, the lighting equipment blinking / illuminance control method, and installation cost for each of the multiple arrangement plans obtained by calculating the illuminance of the luminaire. Select the sequence.

If the lighting device of the present invention is properly arranged, the power consumption can be reduced by 40% or more by reducing the lighting power even if the air conditioning power related to the increase in the air conditioning load due to sunlight is taken into account. It becomes an effective means.
The lighting fixtures that are indispensable for assisting light-diffusing skylights, such as during bad weather and at night, can be handled as a single unit, facilitating layout design and planning in buildings and contributing to the spread of light-diffusing skylights.
The lighting fixtures and light diffusing skylights are integrated, making it easy to maintain and manage lighting fixtures in gymnasiums, factories, and warehouses.

FIG. 1 is a top view of the lighting device of the present invention on a folded plate roof. FIG. 2 is an external view of the lighting device of the present invention on a folded plate roof. FIG. 3 is an example of installation of the lighting device of the present invention in a folded roof building. FIG. 4 is an example of installation of the lighting device of the present invention on a flat roof building. FIG. 5 is an attachment view of the illumination device of the present invention. (A) is the attachment figure to the steel beam which is a building frame of a fixed frame. (B) is the attachment figure to the fixed frame of the movable post which fixed the lighting fixture. FIG. 6 is an electrical piping wiring installation diagram of the present invention. FIG. 7 is a flow diagram of an evaluation method related to the arrangement of the illumination devices in the present invention.

The lighting fixture and the light diffusing skylight are placed one above the other, and the netted glass of the skylight just above the lighting fixture is attached by a gasket method that allows easy removal.
As for the fixing method of lighting fixtures and piping wiring, a handle and hardware are installed so that maintenance from the roof becomes easy.

FIG. 1 is a top view of the present invention installed on a folded plate roof. Since the folded-plate roof is provided with beams every few meters, lighting fixtures are attached to the beams. Providing piping wiring along the beam eliminates the need for piping groundwork and improves the appearance from below.

FIG. 2 is an external view of the present invention installed on a folded plate roof. By providing a hinge on the colored handle provided on the light diffusing plate, a large handle that is easy to handle can be stored in a narrow space with the netted glass.

FIG. 3 is an example in which the present invention is installed in a building with a folded-plate roof. FIG. 4 shows an example in which the present invention is installed in a flat roof building.

FIG. 5 is an example of a fixture for a lighting fixture. Temporarily fix the fixed frame to the beam using bolts. Then, the fixed slit of the movable post is inserted into the post fixing bolt of the fixed frame, and the knob nut is turned and fixed. Finely adjust the direction of the lighting fixture with the fixed frame, and then tighten the bolts of the fixed frame.
When maintaining the lighting fixtures, remove the light-diffusing skylight glass and light diffusion plate, insert your hand through the opening in the skylight, loosen the knob nut by hand, remove the movable post, and lift the lighting fixture to the roof. be able to. After maintenance, install in reverse order.

FIG. 6 is an example of a piping wiring method that can be maintained from the roof. The luminaire is electrically wired from the joint box via a movable ball and a flexible hose. The flexible pipe can be lifted on the roof while being connected.

FIG. 7 is an example of a method for simulating the arrangement of lighting fixtures. By calculating the illuminance using the size / characteristic / required illuminance of the room to be illuminated and the characteristics of the luminaire, multiple solutions of the arrangement of the luminaires are obtained. The arrangement of light diffusing skylights is determined from one solution of the arrangement of lighting fixtures. Next, a method for controlling blinking / illuminance of the lighting fixture is determined. The power consumption of the lighting fixture can be simulated using the above conditions and use time conditions, sunshine data at the construction site, and other weather data. In addition, the cost of lighting equipment and control and the light diffusion type skylight cost will be added and evaluated. The evaluation is calculated for all combinations, and the most appropriate method is selected in consideration of the initial cost and maintenance cost.

In a gymnasium with pools and fixed seats, a factory with large machines, and a warehouse with sorter racks, it is possible to easily and inexpensively maintain lighting equipment, and to maintain an appropriate illuminance environment. It leads to improvement of productivity. Energy saving can be achieved by the light diffusion type skylight.

1 Light diffusing skylight 2 Lighting equipment 3 Light diffusing skylight (for flat roof)
4 Folded plate roof 5 Beam 6 Electric piping 7 Netted glass 8 Light diffuser plate 9 Marker / grip 10 Fixed frame 11 Fixed frame arm 12 Fixed piece 13 Fixed bolt 14 Fixed nut 15 Lower fixed piece 16 Fixed hook bolt 17 Post fixed bolt 18 Movable post 19 Handle 20 Upper handle 21 Fixed plate 22 Fixed slit 23 Knob nut 24 Gasket 25 Skylight cover 26 Electrical wiring joint box 27 Flexible pipe

The present invention relates to a lighting device including a light diffusing skylight that can be maintained and managed from a roof by removing an upper meshed glass, and a lighting device that is disposed immediately below the lighting device, and an arrangement method thereof.

Large-scale buildings such as gymnasiums, factories, and warehouses are often made of steel frames, and often have folded-plate roofs. Origami roofs have a track record of over 30 million square meters per year in Japan, and about 40 % of the roofs are folded.

Large buildings such as gymnasiums, factories, and warehouses generally have high ceilings and lighting fixtures are usually installed at high locations. In the maintenance and management of lighting equipment, it is necessary to replace the light bulb every several thousand hours, to replace the lighting fixture body every 15 years after installation, and to replace the electrical wiring every 20 to 30 years. In the case of LED lighting fixtures, bulb replacement is not necessary, but fixture replacement every tens of thousands of hours and wiring replacement every 20 to 30 years is necessary.

Some light-diffusing skylights are specialized for folding plates. The connection hardware with the folding plate roof is made by local roll molding, so that there is no break, and the glass is installed by using a gasket, so there is no break, so that a light diffusion type skylight with low risk of water leakage can be installed relatively inexpensively It has become.

Light diffusing skylights have been developed for lighting simulations and have been used as general lighting in factories and warehouses. Since the illuminance cannot be obtained with a diffused skylight on bad days, morning and evening, and at night, it is necessary to prepare a separate lighting fixture as an aid.

Patent Publication Showa 62-139202 Skylight Device Patent Publication Hei 1-186501 Indoor Lighting System Patent Publication Heisei 3-241603 Interior lighting system Patent Publication Heisei 6-116610 Solar Daylighting Device Patent Publication 2010-160975 Indoor Lighting Device Full text of utility model Showa 59-0222827 Skylight device Full text of utility model Showa 61-194909 Indoor lighting system

Many techniques combining a skylight or daylighting device and a lighting fixture have been proposed.
For example, in patent document 1 patent publication Showa 62-139202 skylight device, since sunlight and an artificial light source are taken in indoors using a mirror or a half mirror, much energy is wasted by transmission loss and reflection. Moreover, since it can be installed only on a roof with a large slope, it is difficult to use as general lighting in a large space.

Patent Document 2 Patent Publication 1991-186501 An indoor lighting system includes a lighting part, a mirror for tracking sunlight, and a dimming louver. However, by having a solar light tracking system, there is a distance between the daylighting portion and the louver, and the cost is inevitable due to the size and complexity of the device. This is difficult to adopt as general lighting in large spaces.

Patent Document 3 Patent Publication No. Hei 3-241603 In an interior lighting system, a skylight, glass provided on a ceiling surface, polarizing glass, and an artificial light source provided therein provide illumination with high performance regardless of day or night. Since the artificial light source is provided inside the glass or polarizing glass, energy loss is large, the device is complicated, and it is difficult to adopt it as general illumination in a large space.

Patent Document 4 Patent Publication Heisei 6-116610 A solar lighting device is composed of a light irradiation unit composed of a daylighting unit and a light duct and an artificial light source provided in the light irradiation unit, and stores a solar cell as a power source for the artificial light source It is. However, since the artificial light source is in the middle of the light irradiation unit and illuminates the room through the half mirror, the energy efficiency is low. In addition, it is difficult to adopt as general lighting in a large space due to the complexity of the device.

Patent Document 5 Patent Publication 2010-160975 An indoor lighting device includes a skylight that is a daylight illuminator and an illuminator of an artificial light source, and is controlled by an illuminance sensor, and has conditions for general illumination. However, since there is no mechanism to arrange skylights and lighting fixtures in an integrated manner, in normal construction work, the skylights that are handled as joinery or roof construction and the lighting fixtures that are handled as electrical equipment differ between designers and installers. It is difficult to secure the sex. In addition, when the room is divided and used, a part that is inconvenient in terms of illuminance occurs depending on the wall position. Moreover, although the output of a lighting fixture is controlled from the illumination intensity obtained with a skylight, since it cannot be confirmed that it is the optimal skylight arrangement in the first place, it is nothing but the next best measure.

Patent Document 6 Full Text of Utility Model Showa 59-0222827 The skylight device is characterized in that the light from the skylight is sent far away, and the directivity of light is enhanced. Due to the directivity of the light, it is necessary to increase the number of installations in order to use it as general lighting, which is difficult to implement in terms of cost.

Patent Document 7 Full Text of Utility Model Showa 61-194909 In an indoor lighting device, sunlight and artificial light sources are used to reduce energy contrast by reducing the illuminance contrast at the window in the daytime and in the center of the room. However, the amount of light obtained through the optical fiber is small and it is difficult to adopt as general illumination in a large space.

When maintaining and managing lighting fixtures installed in a large-scale building with a high ceiling, a method using an aerial work vehicle, a method using a scaffolding, a method using a catwalk provided in advance on the ceiling, bulb replacement, There is a method of providing a lifting device for exchanging instruments.

Construction using an aerial work platform is relatively inexpensive and can be carried out in a short time, but it becomes an obstacle to work under lighting equipment such as factory production machines and warehouse products when the floor is not flat. Not available when things cannot move. The method of constructing a scaffold is expensive and requires a lot of work time. Scaffolding can be used when the floor is not flat or when obstacles cannot be moved, but this will increase the cost and extend the construction period.

The method of providing a catwalk in advance on the ceiling can perform maintenance work in the shortest time, but it is included in the building structure as the load of the roof and is the most expensive method.

Although the method of providing the lifting device is an inexpensive method, the electric device used for the lifting device operates stably by frequently operating it, but conversely, it tends to become unstable when the usage frequency is low. is there. On the other hand, lighting fixtures have a longer life and maintenance intervals are longer. As a result, the lifting device is used less frequently and may not operate when the lifting device is required for maintenance of lighting fixtures, resulting in inconsistent results, such as frequent maintenance work for the lifting device. ing. Also, it cannot be adopted when an obstacle cannot move. Moreover, the lifting / lowering device cannot handle wiring replacement.

By aligning the arrangement of light diffusing skylights and luminaires, maintenance of the luminaires can be done from the roof, and by combining the appropriate optical characteristics, it is easy to arrange the luminaires Can be determined.

The light diffusion type skylight to which the glass is attached by the gasket can be easily removed. Therefore, luminaires and electric piping are carried out from the opening of the light diffusion type skylight. Similarly, in order to carry out maintenance of the luminaire from the roof, a marker is attached to the light diffusion plate so that the position of the luminaire can be seen through the glass. Glass can be handled safely by using a suction cup. A foldable handle is installed so that the light diffusion plate does not fall below. Further, both of the effects can be obtained by coloring the foldable handle.

In order to maintain the same orientation and angle as before when the luminaire is removed and re-installed, the mounting hardware consists of a part fixed to the steel frame and a part to be removed, both of which are fixed by a knob nut that can be turned by hand To do. Since the slit is provided and fixed by tightening with the nut, the nut can be removed simply by loosening it. This is a method of avoiding the risk of dropping the nut.

Appropriate arrangement is optimized by simulating the power consumption obtained by the light diffusion type skylight, the lighting equipment blinking / illuminance control method, and installation cost for each of the multiple arrangement plans obtained by calculating the illuminance of the luminaire. Select the sequence.

If the lighting device of the present invention is properly arranged, the power consumption can be reduced by 40% or more by reducing the lighting power even if the air conditioning power related to the increase in the air conditioning load due to sunlight is taken into account, which is very effective for energy saving and environmental considerations. It is.
The lighting fixtures that are indispensable for assisting light-diffusing skylights, such as during bad weather and at night, can be handled as a single unit, facilitating layout design and planning in buildings and contributing to the spread of light-diffusing skylights.
The lighting fixtures and light diffusing skylights are integrated, making it easy to maintain and manage lighting fixtures in gymnasiums, factories, and warehouses.

FIG. 1 is a top view of the lighting device of the present invention on a folded plate roof. FIG. 2 is an external view of the lighting device of the present invention on a folded plate roof. FIG. 3 is an example of installation of the lighting device of the present invention in a folded roof building. FIG. 4 is an example of installation of the lighting device of the present invention on a flat roof building. FIG. 5 is an attachment view of the illumination device of the present invention. (A) is the attachment figure to the steel beam which is a building frame of a fixed frame. (B) is the attachment figure to the fixed frame of the movable post which fixed the lighting fixture. FIG. 6 is an electrical piping wiring installation diagram of the lighting device of the present invention. Figure 7 is a flow diagram of the evaluation method for the arrangement of the illumination device in the lighting device of the present invention.

The lighting fixture and the light diffusing skylight are placed one above the other, and the netted glass of the skylight just above the lighting fixture is attached by a gasket method that allows easy removal.
Folding handles and hardware are installed so that lighting fixtures and piping wiring can be fixed easily from the roof.

FIG. 1 is a top view of the lighting device of the present invention installed on a folded plate roof. Since the folded-plate roof is provided with beams every few meters, lighting fixtures are attached to the beams. Providing piping wiring along the beam eliminates the need for piping groundwork and improves the appearance from below.

FIG. 2 is an external view of the lighting device of the present invention installed on a folded plate roof. By providing a hinge on a colored handle provided on the light diffusing plate and making it a foldable type , even a large handle that is easy to handle can be stored in a narrow space with a netted glass.

FIG. 3 shows an example in which the lighting device of the present invention is installed in a folded-plate roof building. FIG. 4 shows an example in which the lighting device of the present invention is installed in a flat roof building.

FIG. 5 is an example of a fixture for a lighting fixture. Temporarily fix the fixed frame to the beam using bolts. Then, the fixed slit of the movable post is inserted into the post fixing bolt of the fixed frame, and the knob nut is turned and fixed. Finely adjust the direction of the lighting fixture with the fixed frame, and then tighten the bolts of the fixed frame.
When maintaining the lighting fixtures, remove the light-diffusing skylight glass and light diffusion plate, insert your hand through the opening in the skylight, loosen the knob nut by hand, remove the movable post, and lift the lighting fixture to the roof. be able to. After maintenance, install in reverse order.

FIG. 6 is an example of a piping wiring method that can be maintained from the roof. The luminaire is electrically wired from the joint box via a movable post and a flexible hose. The flexible pipe can be lifted on the roof while being connected.

FIG. 7 is an example of a method for simulating the arrangement of lighting fixtures. By calculating the illuminance using the size / characteristic / required illuminance of the room to be illuminated and the characteristics of the luminaire, multiple solutions of the arrangement of the luminaires are obtained. The arrangement of light diffusing skylights is determined from one solution of the arrangement of lighting fixtures. Next, a method for controlling blinking / illuminance of the lighting fixture is determined. The power consumption of the lighting fixture can be simulated using the above conditions and use time conditions, sunshine data at the construction site, and other weather data. In addition, the cost of lighting equipment and control and the light diffusion type skylight cost will be added and evaluated. The evaluation is calculated for all combinations, and the most appropriate method is selected in consideration of the initial cost and maintenance cost.

In a gymnasium with pools and fixed seats, a factory with large machines, and a warehouse with sorter racks, it is possible to easily and inexpensively maintain lighting equipment, and to maintain an appropriate illuminance environment. It leads to improvement of productivity. Energy saving can be achieved by the light diffusion type skylight.

1 Light diffusing skylight 2 Lighting equipment 3 Light diffusing skylight (for flat roof)
4 Folded plate roof 5 Beam 6 Electric piping 7 Netted glass 8 Light diffuser plate 9 Marker / folding handle 10 Fixed frame 11 Fixed frame arm 12 Fixed piece 13 Fixed bolt 14 Fixed nut 15 Lower fixed piece 16 Fixed hook bolt 17 Post fixing bolt 18 Movable post 19 Handle 20 Upper handle 21 Fixing plate 22 Fixing slit 23 Knob nut 24 Gasket 25 Skylight cover 26 Electric wiring joint box 27 Flexible pipe

Claims (6)

It is a lighting device for general lighting consisting of a light diffusing skylight and a luminaire provided directly below it. The light diffusing skylight characteristics, lighting device characteristics, lighting device flashing method, and lighting device illumination intensity control method are appropriately A combination. The lighting device according to claim 1, wherein the colored glass is installed on the light diffusing plate in order to make it easy to determine the position of the luminaire from the roof in order to remove the meshed glass and facilitate maintenance from the roof. A light diffusing skylight with either a marker, a handle installed on the light diffusing plate for fall prevention, or a colored handle installed on the light diffusing plate for discrimination and fall prevention. The lighting fixture and mounting bracket used in the lighting device according to claim 1 can be easily installed from below when installed on a roof beam or the like at the time of new installation, and is pulled up from the top during maintenance. It is possible and can be installed in the same orientation as when it was re-installed. An electric piping wiring method capable of maintaining and managing wiring from the roof using the light diffusing skylights of claim 2 in the electric piping wiring connecting the lighting fixtures according to claim 1 and between the lighting fixtures and the switchboard. Estimate the installation cost and operation cost by calculating the power consumption related to lighting for the light diffusion type skylights arranged according to the arrangement of the lighting fixtures obtained from the properties of the room, the required illuminance, and the lighting fixture characteristics, and the optimum. A method of simulating the array of claim 1. A general illumination system comprising a part or all of the illumination device according to claim 1 to the simulation according to claim 5.

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