JP2529477B2 - Indoor lighting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor lighting device, and more particularly to an indoor lighting device using two types of light sources having different lighting characteristics.

[0002]

2. Description of the Related Art In a place with a relatively high ceiling such as a gymnasium, a hotel lobby, a passageway in an underground mall or a plaza, for example, a high pressure sodium lamp and a metal halide lamp are used together,
There are many cases where indirect lighting with a fluorescent lamp and direct lighting with a light bulb are used together. When using a high pressure sodium lamp and a metal halide lamp together, the high pressure sodium lamp has the characteristic that the color rendering property is poor but the lamp efficiency is high.
Since metal halide lamps have the characteristic of low lamp efficiency but good color rendering properties, by using them together, the advantages of both can be utilized to ensure relatively good color rendering properties and required brightness with as little power as possible. (For example, Lighting Society, Lighting Handboo
k, P29 (1984)). On the other hand, the combined use of indirect lighting with a fluorescent lamp and direct lighting with a light bulb provides overall brightness while suppressing unpleasant glare in the former, and focuses on what is necessary by making a locally bright part in the latter. The purpose is to create a changing atmosphere by showing and giving a feeling of glitter (for example, Lighting Society Edition, Lighting Handbook, P434).
(1984)).

On the other hand, recently, in a relatively large indoor space or underground space, there is a growing need to obtain a light environment close to nature, in other words, to obtain a light environment close to the outdoors during sunny day. There is. However, in the above-described conventional cases, even such a purpose cannot meet such a demand of "a light environment close to the outdoors in fine weather".

As is well known, the outdoor light in fine weather is composed of direct light from the sun and diffused light from the blue sky. Therefore, in the outdoor three-dimensional object, the part facing the sun is illuminated by the direct light of the sun, and the shadow part of the direct light is illuminated by the diffused light from the blue sky. Here, for example, a daytime scene displayed on the screen surface of a movie looks like a daytime even though the illuminance on the screen surface is much lower than the outdoor illuminance during the daytime, so direct light illuminating the part facing the sun. If the ratio of the illuminance due to light to the illuminance due to diffused light from the blue sky that illuminates the shaded area due to direct light, and the correlated color temperature of direct sunlight and the diffused light from the blue sky can be reproduced in an indoor space, It is considered that a "near light environment" can be obtained.

Since the correlated color temperature when the direct light of the sun and the diffused light from the blue sky are combined is about 6500K, recently,
This fluorescent lamp with a correlated color temperature of 6500K has been put to practical use (Toshiba Lightec Co., Ltd.). However, since the shaded area is illuminated by diffused light from the blue sky, and not by synthetic light, this lamp does not give the above-mentioned feeling of natural light environment.

[0006]

These problems are due to the fact that neither light with a high directivity corresponding to the direct light of the sun nor diffused light corresponding to the light from the blue sky has been realized, and direct light and diffused light are not realized. It is because the ratio of illuminance due to light and the correlated color temperature are not similar to the outdoor daytime lighting environment in fine weather.

An object of the present invention is to solve the above problems and to provide an indoor lighting device which forms a light environment close to nature and creates a comfortable living space similar to the outdoors even in a closed space such as an underground space. To do.

[0008]

DISCLOSURE OF THE INVENTION To achieve this object, the present invention provides a light source which is arranged in the upper part of the room and which emits light having a strong directivity, and a diffused light which is arranged in the periphery of the light source. (1) Correlated color temperature K1 of a light source that emits light with strong directivity,
And the correlated color temperature K2 of the light source that emits diffused light, K1 <K
It is configured to be 2. (2) In addition to 1, the illuminance E1 by the light source that emits light with strong directivity and the illuminance E2 by the light source that emits diffused light
It is configured so that E1 / 10 ≦ E2 ≦ E1 / 3. (3) Further, the correlated color temperature K1 of the light source that emits light with strong directivity is 5500K or less, and the correlated color temperature K2 of the light source that emits diffused light is 6000K or more.

[0009]

In an indoor lighting device having a light source that emits highly directional light arranged in the upper part of the room and a light source that emits diffused light in the periphery of this light source, the highly directional light is converted into direct sunlight. It has a similar effect, and diffuse light has an effect equivalent to blue sky light. In such an indoor lighting device, by varying the correlated color temperature of light with strong directivity and the correlated color temperature of diffused light, a combination of correlated color temperatures that provides a state close to the outdoor light environment is obtained by subjective evaluation experiments. It was As a result, it was found that by setting the correlated color temperature of highly directional light to 5500K or less and the correlated color temperature of diffused light to 6000K or more, it is possible to obtain a state close to the outdoor light environment. Furthermore, it was found that a condition closer to the outdoor light environment can be obtained by setting the correlated color temperature of highly directional light to 4000 to 5500K and the correlated color temperature of diffused light to 10000 to 15000K. This can be inferred from the fact that the actual correlated color temperatures of direct sunlight and blue sky are 3500-5500K and 6000-20000K, respectively.

In addition, a subjective evaluation experiment was carried out to obtain a combination ratio of illuminances that gives a shade feeling close to an outdoor light environment by changing variously the ratio of the illuminance by the light having a strong directivity and the illuminance by the diffused light. As a result, it was found that when the ratio (E2 / E1) of the illuminance E1 due to the highly directional light and the illuminance E2 due to the diffused light is 1/10 to 1/3, it is possible to obtain a shadow feeling close to the outdoor light environment. It was This is inferred from the fact that the ratio (Eb / Es) of the illuminance Eb due to the direct light and the illuminance Es due to the blue sky light is 1/14 to 1/3.

As described above, by setting the ratio of the illuminance due to the highly directional light and the diffused light and the correlated color temperature to a predetermined value, it is possible to provide a light environment having a psychological sensation equivalent to that in a sunny day outdoors. .

[0012]

EXAMPLES Hereinafter, specific examples will be described in detail. FIG. 1 is an indoor lighting device of the present invention, and FIG. 2 is a plan view. 1 and 2 are examples of installation in a laboratory assuming a hotel lobby with a floor area of 7 m × 7 m. 1 and 2
No. 2 is a light source that emits highly directional light, and consists of a medium-angle light projector with a built-in metal halide lamp (Matsushita Electric Industrial Co., Ltd. output 2000 W, correlated color temperature 5500 K, luminous flux 180,000 lumens). , It was attached to the ceiling a little closer to the wall from the center of the ceiling. 1 and 2 is a light source that emits diffused light, which is a straight tube fluorescent lamp (manufactured by Matsushita Electric Industrial Co., Ltd.,
Output 40 W, correlated color temperature 11000 K, luminous flux 1700 lumens). In order to further increase the diffusion degree of the light of the light source 3 which emits the diffused light, the light source 3 was attached so as to form a light ceiling in combination with the opal white panel 4 made of resin.

An illuminance of about 2000 lx is obtained on the floor surface 1 by the light source 2 which emits light having a strong directivity. Further, since the correlated color temperature is 5500K, a light color that is similar to the direct light of the sun is obtained. An illuminance of about 500 lx on the floor surface 1 is obtained by the light source 3 that emits diffused light. Further, since the correlated color temperature is 11000K, a light color that is similar to blue sky light is obtained. The part of the indoor object facing the light source 2 that emits highly directional light is mainly illuminated by the light source 2 that emits a large luminous flux with strong directional light. It will be illuminated by the emitting light source 3. The illuminance of the floor surface 1 by the light source 3 that emits diffused light is 1/4 of the illuminance of the floor surface 1 by the light source 2 that emits highly directional light, and an approximate shadow feeling can be obtained in daylight on a clear day. It was

In the above description, a hotel lobby of a predetermined size has been mainly described as an example, but it is needless to say that it can be applied to indoors of other shapes.

[0015]

As described above, the present invention provides an indoor lighting device comprising a light source having a strong directivity and a light source emitting a diffused light, and a light source emitting a light having a strong directivity and a light source emitting a diffused light. By providing a predetermined difference in the correlated color temperature and the resulting illuminance, a comfortable light environment close to nature can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an indoor lighting device according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus.

[Explanation of symbols]

 1 Floor 2 Light source that emits highly directional light 3 Light source that emits diffused light 4 Opalescent panel 5 Diffused light 6 Light with high directional 7 Ceiling 8 Wall surface 9 Opalescent panel support material

Claims (3)

(57) [Claims] 1. A light source that emits highly directional light arranged in the upper part of a room and a light source that emits diffused light that is arranged in the periphery of the light source are used as constituent elements and emits light having strong directional property. An indoor lighting device in which a correlated color temperature K1 of a light source and a correlated color temperature K2 of a light source that emits diffused light are K1 <K2. 2. An illuminance E1 by a light source that emits light having a strong directivity and an illuminance E2 by a light source that emits diffused light,
The indoor lighting device according to claim 1, wherein E1 / 10 ≦ E2 ≦ E1 / 3. 3. The indoor lighting device according to claim 1, wherein the correlated color temperature K1 of the light source that emits light with strong directivity is 5500K or less, and the correlated color temperature K2 of the light source that emits diffused light is 6000K or more.