Facility horticultural lighting is a power-consuming process and a production engineering technology. Energy saving and high efficiency are the main goals to pursue. The facility horticultural LED lighting system is the executive body of the facility horticultural semiconductor lighting, and its intelligence and energy-saving performance are directly related to the lighting efficiency and effect.
From the process of light energy generation to plant absorption and utilization, the light energy utilization efficiency of facility horticultural LED lighting system refers to the efficiency of converting electrical energy into light energy and being utilized by plants. It is controlled by three links, namely LED light source and LED lamps, LED light suspension device and control system, light environment intelligent control system.
The light energy utilization efficiency of facility horticultural LED lighting systems needs to be continuously improved and optimized. The ways to improve the light efficiency of the LED lighting system for facility horticulture mainly include the following ways.
①LED light source and LED light luminous efficiency. The luminous efficacy of the light source is evaluated by the ratio of the photosynthetically effective photon flux output by the artificial light source to its unit power consumption, that is, the photosynthetically effective photon efficiency (mol/W), but this must be based on spectral construction.
First of all, in terms of light quality construction of LED chips, low-cost, energy-saving and high-efficiency spectrum is obtained through chip selection, spectrum construction, phosphor application, packaging method, etc.; secondly, the appropriate LED lamp bead luminous angle and LED array arrangement are selected according to needs. , to obtain suitable light intensity distribution and uniformity in the vertical direction; thirdly, through the design of the luminous surface of the LED light source lamp, the maximum canopy light energy interception rate is obtained, and the lighting efficiency is improved; Better input-output efficiency.
At present, several common heat dissipation methods are: natural cooling, active air cooling, direct liquid cooling, etc., through thermal conduction, thermal convection and thermal radiation.
②LED lamp suspension device and control system efficiency. The LED lamp suspension device and control system involve the relative spatial relationship between the LED lamp and the crop canopy, and involve parameters such as beam irradiation direction, irradiation surface, and canopy light interception ratio. The intelligent control system of light environment is related to three aspects: the time-space bioavailability of light, the suitability of intensity and the benefit of yield and quality.
LED lamp suspension device and control system include technical approaches such as suspension method, spatial position adjustment device, cultivation platform innovation and regulation.
The essential feature of facility horticultural semiconductor lighting is the precise, dynamic and on-demand regulation of the light environment (light quality, light intensity and photoperiod). The implementation of efficient agricultural semiconductor lighting requires the establishment of different regulation based on the spatial and temporal laws of agricultural biological light environment requirements. Strategy, it is urgent to build agricultural semiconductor lighting big data and intelligent control system.
The control of light quality, light intensity and photoperiod corresponds to the law of plant light environment requirements from the perspective of light quality and quantity, and provides suitable light environment conditions for plant growth to maximize the potential of plant growth and development from the perspective of space and time. , to maximize the rapid and high-quality growth of plants. In order to build the big data of agricultural semiconductor lighting, it is necessary to focus on the agricultural production field and agricultural biological species, focus on optimizing the types of light quality and their quantitative attributes, establish dynamic data of high-quality and high-yield light environment requirements, and establish control strategies and software and hardware equipment.
Facility Horticultural Semiconductor Lighting Technology
Facility horticultural lighting is a power-consuming process and a production engineering technology. Energy saving and high efficiency are the main goals to pursue. The facility horticultural LED lighting system is the executive body of the facility horticultural semiconductor lighting, and its intelligence and energy-saving performance are directly related to the lighting efficiency and effect.
From the process of light energy generation to plant absorption and utilization, the light energy utilization efficiency of facility horticultural LED lighting system refers to the efficiency of converting electrical energy into light energy and being utilized by plants. It is controlled by three links, namely LED light source and LED lamps, LED light suspension device and control system, light environment intelligent control system.
Therefore, in order to improve the light energy utilization efficiency of the facility horticultural LED lighting system, it is necessary to analyze and develop from the above three aspects.
The light energy utilization efficiency of facility horticultural LED lighting systems needs to be continuously improved and optimized. The ways to improve the light efficiency of the LED lighting system for facility horticulture mainly include the following ways.
①LED light source and LED light luminous efficiency. The luminous efficacy of the light source is evaluated by the ratio of the photosynthetically effective photon flux output by the artificial light source to its unit power consumption, that is, the photosynthetically effective photon efficiency (mol/W), but this must be based on spectral construction.
First of all, in terms of light quality construction of LED chips, low-cost, energy-saving and high-efficiency spectrum is obtained through chip selection, spectrum construction, phosphor application, packaging method, etc.; secondly, the appropriate LED lamp bead luminous angle and LED array arrangement are selected according to needs. , to obtain suitable light intensity distribution and uniformity in the vertical direction; thirdly, through the design of the luminous surface of the LED light source lamp, the maximum canopy light energy interception rate is obtained, and the lighting efficiency is improved; Better input-output efficiency.
At present, several common heat dissipation methods are: natural cooling, active air cooling, direct liquid cooling, etc., through thermal conduction, thermal convection and thermal radiation.
②LED lamp suspension device and control system efficiency. The LED lamp suspension device and control system involve the relative spatial relationship between the LED lamp and the crop canopy, and involve parameters such as beam irradiation direction, irradiation surface, and canopy light interception ratio. The intelligent control system of light environment is related to three aspects: the time-space bioavailability of light, the suitability of intensity and the benefit of yield and quality.
LED lamp suspension device and control system include technical approaches such as suspension method, spatial position adjustment device, cultivation platform innovation and regulation.
③Light environment intelligent control system efficiency. Real-time on-demand light supply can be achieved to maximize the biological functions of light energy and light signals.
The essential feature of facility horticultural semiconductor lighting is the precise, dynamic and on-demand regulation of the light environment (light quality, light intensity and photoperiod). The implementation of efficient agricultural semiconductor lighting requires the establishment of different regulation based on the spatial and temporal laws of agricultural biological light environment requirements. Strategy, it is urgent to build agricultural semiconductor lighting big data and intelligent control system.
The control of light quality, light intensity and photoperiod corresponds to the law of plant light environment requirements from the perspective of light quality and quantity, and provides suitable light environment conditions for plant growth to maximize the potential of plant growth and development from the perspective of space and time. , to maximize the rapid and high-quality growth of plants. In order to build the big data of agricultural semiconductor lighting, it is necessary to focus on the agricultural production field and agricultural biological species, focus on optimizing the types of light quality and their quantitative attributes, establish dynamic data of high-quality and high-yield light environment requirements, and establish control strategies and software and hardware equipment.