The relationship between the spectrum of plant growth lamps and photosynthesis Oct 09 , 2021

The solar spectrum is a continuous spectrum, in which the blue and green spectrum are stronger than the red spectrum, and the visible light spectrum ranges from 380 to 780 nm. The growth of organisms in nature is related to the intensity of the spectrum. For example, most plants in the area near the equator grow very fast, and at the same time, the size of their growth is relatively large. However, the intensity of the sun's irradiation is not as high as possible, and there is a certain degree of selectivity for the growth of animals and plants. Several key auxins that affect plant growth have significant differences in light absorption spectra. Therefore, the application of LED plant growth lights is not a simple matter, but very targeted. Here it is necessary to introduce the concepts of the two most important photosynthetic plant growth elements.

Chlorophyll Chlorophyll is one of the most important pigments related to photosynthesis. It exists in all organisms that can create photosynthesis, including green plants, prokaryotic blue-green algae (cyanobacteria) and eukaryotic algae. . Chlorophyll absorbs energy from light, which is then used to convert carbon dioxide into carbohydrates. Chlorophyll a mainly absorbs red light, and chlorophyll b mainly absorbs blue-violet light, mainly to distinguish shade plants from sun plants. The ratio of chlorophyll b to chlorophyll a of shade plants is small, so shade plants can use blue light strongly and adapt to growing in shade. Chlorophyll a is blue-green, and chlorophyll b is yellow-green. There are two strong absorptions of chlorophyll a and chlorophyll b, one in the red region with a wavelength of 630~680 nm, and the other in the blue-violet region with a wavelength of 400~460 nm.

Carotenoids Carotenoids (carotenoids) are a general term for a class of important natural pigments, which are commonly found in yellow, orange-red or red pigments in animals, higher plants, fungi, and algae. So far, more than 600 natural carotenoids have been discovered. Carotenoids absorb light in the range of 303~505 nm. They provide the color of food and affect the human body's intake of food; in algae, plants and microorganisms, their color cannot be presented because of being covered by chlorophyll. In plant cells, the carotenoids produced not only absorb and transfer energy to help photosynthesis, but also have the function of protecting cells from being destroyed by excited single-electron bond oxygen molecules. The spectrum required for plant growth should be a continuous spectrum with a certain distribution width. It is obviously inappropriate to use a light source made of two specific wavelength chips of red and blue with a very narrow spectrum. It is found in experiments that plants will occur. It is yellowish, the leaf stem is very light, the leaf stem is very thin and so on.

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