In-depth discussion of the secrets of LED plant light spectral data
In the past, plants only grew according to the change of seasons, but nowadays, plants under LED plant lights can change the law of plant growth according to the seasons. Changing the seasonality of plant growth is controlled by artificial environment, while plant lights only complete the growth process of plants. If the environment does not change, the growth of plants still depends on the season.
Plant factories are cross-border products, and plant light spectrum technology is an important connection point between planting equipment and planting technology. The planting process determines the spectral design, and the design and manufacture of the plant lamp is to ensure that the light quality required by the planting process can reach the best efficiency. To understand the secret of LED plant lights, you must have a deep understanding of what the spectrum of LED plant lights is.
Non-visual applications of the spectrum
Spectral applications are divided into visual applications and non-visual applications. Lighting belongs to visual applications. grow Light belongs to non-visual applications. Visual applications and non-visual applications are different in terms of the physical dimensions of the spectrum itself. However, many plant lights are still seen as lighting units. Labeling parameters, this parameter labeling that will cause confusion in the application may come from the term "grow Light".
The essence of the spectroscopic study of plant photosynthesis is the analysis of the distribution form and quantity (light quality) of the optical radiation power or light quantum within the defined range of wavelength. This analysis is achieved through spectral data and spectrograms.
Sunlight spectrum
Plant cultivation needs to study the solar spectrum. The solar spectrum tested on the ground belongs to the absorption spectrum. The standard solar spectrum is shown in Figure AM1.5G (G173-03). Due to the geographical location and the season, the amount of spectral radiation measured on the ground will vary. There are differences, but the shape of the spectrum is the same.
The general theory of plant photosynthesis is to study the wavelength range of 400nm-700nm. The AM1.5G which limits the wavelength to this range shows that the spectral shape is close to a rectangle.
The sunlight spectrum is an important reference for the plant light spectrum design, but it does not have dependence. Trying to imitate the sunlight spectrum to the plant light is a futile and inefficient approach.
The ratio of red, green, and blue radiation of AM1.5G in the 400-700nm wavelength range is:
Red light accounted for 32.62%, green light accounted for 35.38%, and blue light accounted for 32.69%.
Analyzing the sunlight in a planting area is very important for planting in this area. It should be measured locally with professional instruments so that it can be accurately analyzed.
The red, green, and blue radiation ratios of this spectrum in the 400-700nm wavelength range are:
Red light accounted for 28.7%, green light accounted for 36.58%, and blue light accounted for 35.43%.
It can be seen that the red, green, and blue components of the spectrum are different due to different geographical locations, which has a greater impact on the design of solar-type and hybrid plant factories.
Accurate analysis of the local sunlight spectrum can provide a scientific reference for photosynthesis for the planting process of solar-type and hybrid plant factories, and can correctly provide the basis for the selection of fill light. For solar-type plant factories, accurate spectrum Analysis is more conducive to the way SPA2.
The spectrum of the LED plant light is discussed as the key point, because the spectrum of the LED light source can be designed according to the requirements of the planting process. At the same time, the spectrum of the LED light source can be controlled by dimming technology. The LED light source is currently the only The variable-spectrum plant light source and the variable-spectrum technology of plant lights are mainly aimed at light form control, which has little effect on energy saving. Ordinary plant lights can also save energy by adjusting the photo period, and the application cost of variable spectrum will increase a lot.
1) The highest PPF can be calculated according to the spectral shape of the LED
After the spectral form of the plant light is determined, the highest YPF or PPF corresponding to this spectral form can be calculated. This is very important for evaluating the application of LED plant lights and is also the main method for comparing the performance of LED plant lights with other types of plant lights. You can refer to the following table we made:
The highest radiation efficiency of the current LED packaging technology in bulk supply is less than 40%:
Light source radiation efficiency = (radiation power/electric power)×100%
2) The spectral design of LED plant lights reflects the manufacturer's quality capabilities
The spectral design of LED plant lights is the equipment support capability required by the planting process, is related to the market competitiveness of plant light manufacturers, and is the main feature of measuring the manufacturer’s technology and process. The spectral design of plant lights reflects the manufacturer’s preference for LED chips. The choice of packaging, spectrum analysis and calculation capabilities of plant lights, light distribution design of lamps, light quantum field uniformity control, drive technology, heat dissipation technology, product reliability control, installation structure design and other comprehensive manufacturing levels mark the manufacturer The technical strength of the products in the market, the application of the above aspects to evaluate the plant light products can reduce investment risks and procurement risks.