JPH06276860A - High-luminance discharge lamp for plant growth - Google Patents

Abstract

PURPOSE:To obtain a high-luminance discharge lamp for plant growth capable of efficiently supplying energies of blue light, green light and red light required for plant growth in a good balance. CONSTITUTION:Two arc tubes having different light qualities are set in an outer bulb and a high-luminance discharge lamp for plant growth is constituted to successively increase energies of blue light, green light and red light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a high-intensity discharge lamp for growing plants.

[0002]

2. Description of the Related Art Conventionally, a fluorescent lamp has been used as a light source for growing plants. However, since the fluorescent lamp has a low light conversion efficiency, it is suitable for ornamental plants such as Saintpaulia, but cannot be used in a plant growing factory or the like where a high light amount of about 20,000 lux is required.

Therefore, conventionally, a high pressure sodium lamp and a fluorescent mercury lamp have been used alone or in combination.

[0004]

By the way, when a high-pressure sodium lamp is used alone, the high-pressure sodium lamp has a large amount of red light component. For example, spinach or the like undergoes remarkable growth and its shape is often changed, resulting in a decrease in commercial value. There is a drawback that leads to. In addition, since the fluorescent mercury lamp has many blue light components, the leaves are thick and the stems become clogged, resulting in suppressed growth. Further, when the high pressure sodium lamp and the fluorescent mercury lamp are used together, the red light component and the blue light component are mixed to some extent. However, if a high-pressure sodium lamp and a fluorescent mercury lamp are used together, one lamp requires one luminaire, resulting in higher costs, and more efficient red light and blue light emission. Is difficult to do.

The present invention has been made in view of the above points, and can provide the energy of blue light, green light, and red light required for plant growth in a well-balanced, efficient, and inexpensive manner. An object is to provide a high-intensity discharge lamp for growing plants.

[0006]

The present invention has the following constitution in order to solve the above problems. In other words, inside the outer bulb of the discharge lamp,
It accommodates two arc tubes with different light quality. The blue, green, and red energies of the two lamp arc tubes are sequentially increased.

[0007]

According to the high-intensity discharge lamp for cultivating plants having the above structure, the energy of blue light, green light and red light is sequentially increased, so that the plants are irradiated with the optimal light energy in a well-balanced manner. It Further, since the two light emitting tubes are housed in the outer bulb, optimum light mixing can be obtained at low cost.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a high-intensity discharge lamp for growing plants, in which an outer bulb 2 contains two arc tubes 3 and 4 having different light qualities. Reference numeral 5 is a base, and 6 and 7 are contacts of the base 5.

[0009] For example, as a result of experiments, it is possible to efficiently promote the growth of plants by approaching the photosynthetic action curve shown in FIG. Backed up. The photosynthesis action curve shown in FIG. 2 shows that blue light (400 to 500 nm) is 23.8% and green light (5
32.4% of red light (600 to 600 nm)
00 nm) is 43.8%. Like this, blue light,
The energies of the green light and the red light need to increase sequentially. In order to approach the photosynthesis action curve of FIG. 2, the following combinations can be obtained.

Group A When a 400 watt high pressure sodium lamp (NH400DX) and a 400 watt metal halide lamp (M400L) are used in combination, the photosynthetic action curve is as shown in FIG. According to FIG. 3, blue light is 25.6%, green light is 34.2%, and red light is 40.2%.

Group B When a 150 watt high pressure sodium lamp (NHT150DX) and a 150 watt metal halide lamp (MT150DL) are used in combination,
The photosynthetic action curve is as shown in FIG. According to FIG. 4, the blue light is 27. 3%, green light 32.3%,
Red light is 40.4%.

C group When a high pressure sodium lamp of 50 watts (NHT50DX) and a metal halide lamp of 150 watts (MT150WL) are used in combination, the photosynthetic action curve is as shown in FIG. According to FIG.
Blue light 24.8%, green light 35.2%, red light 4
It is 0.0%. The types of lamps in parentheses of Group A to Group C indicate the in-house type of Iwasaki Electric Co., Ltd., who is the applicant of the present patent.

Further, for example, if the ratio of blue light, green light and red light is the same, the plants do not absorb light above the photosynthetic action curve, so light above the photosynthetic action curve is wasted.

Further, for example, when the ratio of blue light, green light and red light is reversed and the amount of blue light is increased, the growth of plant leaves is suppressed.

[0015]

As described above, according to the present invention, the luminous bulbs of two lamps having different light qualities are housed in the outer bulb of the discharge lamp, so that the blue light, the green light and the red light necessary for the plant can be obtained. A large number of lighting fixtures are not required to obtain the energy of light, the structure can be inexpensively constructed, and further, a desired mixed light can be easily obtained.

Further, since the energy of blue light, green light and red light is increased in sequence, it has a unique effect of promoting the growth of plants.

[Brief description of drawings]

FIG. 1 is a side view of a high-intensity discharge lamp for growing plants according to the present invention.

FIG. 2 is a photosynthetic action curve diagram required for plants.

FIG. 3 is a photosynthetic action curve diagram of Example A.

FIG. 4 is a photosynthetic action curve diagram of Example B.

FIG. 5 is a photosynthetic action curve diagram of Example C.

[Explanation of symbols]

 1 High-intensity discharge lamp for growing plants 2 Outer bulb 3, 4 Arc tube 5 Base 6, 7 contacts

Claims (1)

[Claims] 1. A structure in which two light-emitting tubes having different light qualities are housed in the outer bulb of a discharge lamp and the energy of blue light, green light and red light of the two light-emitting tubes sequentially increases. A high-intensity discharge lamp for growing plants characterized by the above.