Plant light spectrum Oct 09 , 2021

When the human eye sees a rainbow, we see 7 kinds of spectrum-red, orange, yellow, green, blue, indigo, and purple. However, there are other spectra that the human eye cannot see. PAR-photosynthetically active radiation-range is a spectrum useful for plants to perform various processes. Chlorophyll, which makes most plants appear green, is a pigment that absorbs light in the PAR spectrum. The light absorbed by chlorophyll is then converted into energy through photosynthesis. There are many colors of light in the PAR spectrum, but not all light frequencies are visible to the human eye. However, each color triggers different functions in plants. Some colors in the lighter range are more useful or effective for plant health than others. Humans tend to regard green light as the brightest in the various visible color ranges. Although it looks bright to us, the photosynthesis efficiency of green light is not as efficient as that of red and blue waves. It has been found that blue light promotes leaf growth (leaf and stem), while red light promotes flowering, fruiting and root growth. Although we don't think red or blue light is very bright, these two ranges provide the most effective amount of light needed by plant cells to produce energy. Some plant growth lights are designed to take full advantage of those effective wave colors, and only use blue or red. The "dual band" luminous lamp uses these two colors and mixes them into purple or pink to produce the best plant growth. Plants can only thrive under a combination of red and blue light. So, what about the more common white plant lights? All white light is considered "full spectrum" light. In other words, white light includes all the light colors in the visible spectrum and the PAR spectrum-but we think it is white. White light can also be changed. The colors in white light are mixed in different proportions. If you have ever seen "cold" light, it tends to have a slight bluish tint. That's because it contains a higher proportion of blue light. "Warm" light is mixed with a higher proportion of red light. Because full-spectrum light includes a certain proportion of the PAR spectrum, it provides all the different ranges that will affect different things on the plant. However, a blend of all ranges is a less efficient system to provide what plants need most-red and blue.

Quanxing Optoelectronics disassembled full-spectrum LED plant light, the luminous efficiency is as high as 2.8umol/J

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