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There are two kinds of water plants, chlorophyll a, chlorophyll B. B is not directly involved in the photosynthetic reaction, its function is to transfer the absorbed light energy to chlorophyll a, which can only be called "accessory pigment", while chlorophyll a is directly involved in the photosynthetic reaction, called the "main pigment", so in promoting the function of light, chlorophyll a is better than chlorophyll b, but chlorophyll b also helps to absorb more broad spectral bands. The chlorophyll a and chlorophyll b are slightly different in structure, and the absorption rate of light energy is different, but they can absorb red and blue light, so the most easy to carry out photosynthesis is red area and blue area.

Which chlorophyll a in the blue region of the absorption peak at 430 nm, in the red light district is located in 660 nm, while chlorophyll b absorption peaks in the blue region located at 435 nm, in the red light district is located in 643nm aquatic plants chlorophyll content to the content of chlorophyll a most accounted for more than 75%, its absorption spectrum for aquatic weeds growth main spectral. If the combination intensity of the spectrum, the more close to the absorption spectrum of chlorophyll a, will be the most easy to be used in the photosynthesis above the water, so the absorption spectrum of chlorophyll a is known as the "best photosynthetic band" for photosynthesis. From the perspective of aquatic cultivation, in the choice of light source, if the light quality closer to chlorophyll a absorption spectra were more beautiful, for example, Grow plant light quality usually in accordance with chlorophyll a absorption spectra of imitation of, so theory of cultivated plants most favorable.