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| Effects of the Frequency and Duty Cycle of Pulse LED Light Sources with Different Wavelengths on Plant Photosynthetic Rate and Photocarbon Capacity |
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| （1. Yancheng Teachers University, Yancheng 224007, China; 2. Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. Sinoinnovo Technology Guangdong Company, Dongguan 523000, China; 4. Shanghai Institute of Technology, Shanghai 201418, China; 5. Xuyu Optoelectronics Co., Ltd, Shenzhen 518101, China; 6. Jiangsu Xingjie Technology Co., Ltd, Yancheng 224000, China; 7. Suqian University, Suqian 223600, China) |
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Abstract Abstract: This article analyzes the research progress of pulsed light emitting diode (LED) light sources and aims to produce different wavelength pulse LED light source light panels, and to measure the variation of photosynthetic photon flux density (PPFD) at 25 cm below the lamp panel with the change of wavelength, frequency, and duty cycle of the light source. Under the condition of fixed light source duty cycle, the variation of photosynthetic rate with frequency was studied, and it was found that under different wavelengths, the plant photosynthetic rate had its respective optimized frequency; under the condition of fixed light source frequency, the variation of photosynthetic rate with duty cycle was studied, and it was found that under different duty cycles, the plant photosynthetic rate had its respective optimized duty cycle. Because its PPFD cannot be kept constant with the change of duty cycle and frequency under the condition of fixed frequency or duty cycle, the concept of photocarbon capability is proposed with photocarbon capability=photosynthetic rate⋅PPFD-1=Pn⋅PPFD-1, its biological significance is how many carbon dioxide molecules can be stimulated by a photon energy to photosynthesis. Under the condition of fixed light source duty cycle, the variation of photocarbon capacity with frequency change was studied. Each type of light source has a corresponding optimized frequency, corresponding to the maximum photosynthetic rate under this type of light source; each type of light source has a corresponding optimized frequency, corresponding to obtaining the maximum PPFD under this type of light source; each type of light source has a corresponding optimized frequency, which corresponds to the maximum photocarbon capacity under this type of light source. This article proposes a method to measure the corresponding relationship between plant lighting parameters and carbon reduction by proposing light carbon capacity. It is hoped that in the future, optical design can achieve the most economical carbon reduction by optimizing this parameter to obtain the optimal lighting conditions.
Key words: full spectrum; photocarbon capacity; photosynthetic rate; PPFD; pulse light
CLC number: Q945.11 Document code: ADOI:10.3969/j.issn.1007-7146.2024.01.006
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