The spectral design capability of LED grow light is the performance of the comprehensive manufacturing level of equipment support capability required by planting technology, LED chip and packaging technology, grow light spectral analysis and calculation capability, light distribution design, light quantum field uniformity control, driving technology, heat dissipation technology, product reliability control, installation structure design and so on.
1. The manufacturing process of led grow light affects the PPFDvalue.
Usually, the planting process needs to propose the daily radiation based on a certain light quality, or the PPFDs of the planting surface (some planting techniques require YPFDs) and photoperiod. The daily radiation determines the PPFDs and photoperiod. The designer calculates the PPF (or YPF) of the LED light source according to the PPFDs, and then designs the spectrum. It should be noted that under the same PPF value of the light source, different light distribution design, heat dissipation design and drive design lead to obvious differences in PPFD. the manufacturing process has a great influence on the electric energy utilization efficiency of plant lamps. This effect can be measured by the PPF value and PPFDvalue of electric power per watt, the higher the better. For LED light source: PPF/w, for planting surface: PPFD/w, comparing these two indexes of plant lamp with the same spectral shape, the manufacturing process level of the manufacturer can be evaluated.
2. The LED grow light spectrum is not the best, only the most suitable.
Because the spectrum of LED grow light can be designed, the spectrum of LED grow light shows diversity, and each kind of plant light spectrum is advertised by the designer as the best, here we emphasize that the spectrum is not the best, only the most suitable for some kind of planting technology, trying to make the LED spectrum universal is not a good design idea, high compatibility spectrum design is at the expense of planting efficiency and waste of electric energy.
3. Pay attention to the radiation field uniformity of the radiation surface.
For the plant light spectrum of a variety of single-wavelength lamp beads, the uniformity of the radiation surface after the mixing of many kinds of radiation needs to be considered, mainly the arrangement of lamp beads, light distribution design, installation height of lamps and lanterns, etc. The uniformity of the radiation field affects the photosynthetic efficiency. For the three-dimensional planting of the shelf structure, Lambert light distribution is used as far as possible, and for the greenhouse supplementary light lamp with lens, the uniformity of the radiation field needs to be paid more attention. it should be made clear that by increasing the installation height to improve the uniformity of the radiation surface, the result is to reduce the PPFDvalue at the rate of the second power of the distance.
4. Pay attention to the efficiency of LED grow light
The lamp efficiency of plant lamp is the ratio of PPF value of lamp to PPF value of light source, this value is less than 1, which is related to the light distribution design of secondary optics. The efficiency of LED grow light is usually between 0.9 and 0.5. the lamp efficiency affects the energy consumption index and planting efficiency of led grow light, and the efficiency of led grow light
5. On the spectral ratio.
Up to now, many grow lights are still described by the lamp-bead ratio of various spectra when talking about the spectral ratio. Because the lamp-bead ratio can not reflect the amount of radiation, this problem needs to understand the supply specifications of LED chips. LED chips are classified and supplied according to the radiation power of the same chip size, and the LED spectrum provided by the lamp-bead ratio may have a 30% deviation. This is also one of the reasons why the planting effect of different batches of the same product is different. The correct spectral ratio is to compare the radiation power of the RGB band according to the wavelength range of PAR, so that there will be a data basis for providing the product.
6. The spectrum with UV and IR bands is needed.
In order to increase the spectrum of UV and IR segments, the planting process is mainly to control the light morphology of plants. For LED grow lights with UV and IR segments, it is not suitable to use micro-molar expression in UV and IR segments, but radiation parameters, and provide PPF and YPF values at the same time, otherwise, the radiation requirements of UV and IR put forward by planting technology can not be expressed correctly.
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