Illumination – Plural light sources – Particular wavelength
Reexamination Certificate
2001-04-19
2002-11-05
O'Shea, Sandra (Department: 2875)
Illumination
Plural light sources
Particular wavelength
C362S805000, C362S800000
Reexamination Certificate
active
06474838
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to an artificial lighting apparatus using high intensity red and blue light emitting diodes as a mixed light source for young plants, especially the plantlets growth in tissue culture vessel. During the lightperiod provided to the plant, the light quantity, light quality, duty ratio and frequency of the mixed light source of the present invention are adjustable.
2. Description of the Related Art
In the past, tubular fluorescent lamps (TFLs) were used as artificial light sources in plant tissue culture. However, TFL has problems including heat generation, easily decay, fixed light quality, short life span and flickering. Light emitting diodes (LEDs) have no excess heat problem so that LEDs can be arranged very close to the cultured plant to save culturing space. In addition, LEDs have the advantages of a long life span and low power consumption. Therefore, the research in culturing plants with LEDs has been proceeding. In 1992, Hoenecke, et al. successfully cultured vegetables by high intensity red LEDs (Hoenecke, M. E., R. J. Bula, and T. W. Tibbitts, 1992, Importance of ‘Blue’ photon levels for lettuce seedlings grown under red-light-emitting diodes, HortScience 27 (5) :427-430). In 1993, blue LEDs were successfully developed. In 1996, Okamoto et al. used high intensity red LEDs and blue LEDs to culture plants, with the quantum ratio of 2:1 for red light/blue light (Okamoto, K., T. Yanagi and S. Takita, 1996, Development of plant growth apparatus using blue and red LED as artificial light source, Acta Hort., 440 :111-116). Also in 1996, Yanagi et al. used blue LEDs (170 &mgr;mol/m
2
/s) to culture lettuce (Yanagi, T., K. Okamoto and S. Takita, 1996, Effects of blue, red and blue/red lights of two different PPF levels on growth and morphogenesis of lettuce plants, Acta Hort, 440 :117-122). The dry weight of the cultured lettuce using pure blue light was less than that of the lettuce cultured by pure red light or red/blue light. Nevertheless, the cultured lettuce was short and healthy.
SUMMARY OF THE INVENTION
All the prior researches were made on a small scale, while the present invention is provided for the purpose of mass production. The present invention provides a plant-growing bench including at least one electric track and a plurality of lamps. The lamps, named LEDsets, are detachably mounted on the electric track. Each of the LEDset includes a first type of light emitting diodes, a second type of light emitting diodes and a mounting box. The two types of light emitting diodes are alternately arranged. The electric track supplies the LEDsets with power to light the light emitting diodes.
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patent: 5012609 (1991-05-01), Ignatius et al.
patent: 5660461 (1997-08-01), Ignatius et al.
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patent: 6312139 (2001-11-01), Baker et al.
Fang Wei
Jao Rueychi
Lee Den Hua
Birch & Stewart Kolasch & Birch, LLP
Fang Wei
O'Shea Sandra
Sawhney Hargobind S
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