Illuminator for plant growth

Abstract

The present invention provides an illuminator for plant growth that can illuminate a plant intermittently(pulse illumination) or continuously to cause an effect similar to sunbeam spot phenomenon, thereby accelerating photosynthetic reaction. Specifically, the illuminator for plant growth includes a light source composed of a semiconductor optical device, a control unit for outputting a turn-on timing signal for the light source, a rhythm signal detecting unit for A / D converting an input rhythm signal, a timing signal modulating unit for modulating the turn-on timing signal with the output signal from the rhythm signal detecting unit, and a pulse drive unit for pulse-modulating a power signal with the modulated turn-on timing signal outputted from the timing signal modulating unit and supplying the pulse-modulated power signal to the light source.

Description

technical field [0001] The invention relates to a lighting device for plant cultivation which utilizes light-emitting diodes and other pulsed light or strong and weak continuous light to irradiate plants to promote photosynthesis and activate it. Background technique [0002] In recent years, the practical application of factory plant cultivation systems using artificial light sources, which are not easily affected by external factors (weather, climate, pests, etc.), is being promoted. The main artificial light sources include high-pressure sodium lamps, low-pressure sodium lamps, xenon lamps, metal halide lamps, fluorescent lamps and microwave lamps, among which high-pressure sodium lamps with high luminous efficiency are the mainstream. [0003] However, in artificial light sources such as high-pressure sodium lamps, the balance between red light (wavelength range: 640-690nm) and blue light (wavelength range: 420-470nm), which are important for photosynthesis, is poor. ou...

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Problems solved by technology

[0003] However, in artificial light sources such as high-pressure sodium lamps, the balance between red light (wavelength range: 640-690nm) and blue light (wavelength range: 420-470nm), which are important for photosynthesis, is poor. output is necessary

Moreover, although the luminous efficiency of the low-pressure sodium lamp is higher than that of the high-pressure sodium lamp, there is a light quality problem of outputting a single wavelength light of the sodium D line, and it is difficult to increase the output.

[0004] Moreover, the artificial light source mentioned above increases the air conditioning load due to the large amount of heat radiation. At the same time, in order not to be affected by the heat radiation, a certain distance needs to be kept between the plant and the device, which easily leads to the problem of increasing the size of the device.

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