Even if the light is uniform, the growth of the plants can be even and the shape of the plants can be normal. The growth of plants is phototropism, and plants will grow towards strong sunlight under normal circumstances. Each plant will produce a certain amount of auxin. When the light is uneven, the auxin will be transported horizontally, and the auxin in the plant will be transported to the direction of the backlight so that the plant will bend and grow to the place with strong light. In large-scale breeding, uneven light will cause uneven absorption of light by crops, so some grow taller, some grow slower, and taller ones will cover the lower ones, which will increase uneven growth. happened. The uneven light will also cause uneven heat, where the light is too low, the crop grows slowly, and the light is too high will burn the crop. We need to arrange the LED plant light reasonably, arrange the number of LED plant lights reasonably, and arrange the size reasonably so that the light received by the plant module is relatively uniform, and the plants grow evenly.
The effect of the arrangement of LED plant light emitting particles on the uniformity of light
In order to improve the illumination uniformity of the light-receiving surface of the LED tissue culture area, the arrangement positions of the LED luminescent particles of the two and three tubes are optimized respectively. Table 1 shows the comparison of illumination uniformity before and after the optimization of the arrangement of LED luminescent particles in the two cases at a light-receiving distance of 300mm.
Optimization of two LED plant light tubes
Two LED tubes are arranged in parallel on the top of a single-layer shelf with a length of 1,200mm, a width of 500mm, and a height of 300mm. The spacing of the tubes is calculated and optimized through the Matlab software according to the method of improving the uniformity of illumination described in the design principle. The power coefficient of the LED particles in the lamp tube is cyclically corrected, and finally, the optimized lamp tube spacing is 290mm. After optimization, the light uniformity value produced by the two lamps on the light-receiving surface. It is 0.79, the arrangement of the LED particles of the two tubes is the same, and the illuminance distribution of the light-receiving surface is shown in Figure 1. In order to compare the improvement of illumination uniformity before and after optimization, the scheme module of Tracepro software is used to establish a model of the uniform arrangement of lamp particles (before optimization), and the lamp spacing is kept the same as the optimized lamp spacing (290mm), and the simulation shows that the particles are uniform. The light distribution of the light-receiving surface in the arrangement. The uniformity of light produced by the lamp tube with unoptimized particle arrangement on the light-receiving surface is 0.49, and the illuminance distribution of the light-receiving surface is shown in Figure 2. After the optimization of the particle arrangement of the two lamps, the uniformity of the illumination on the light-receiving surface is increased by about 60% compared with the before optimization. Figure 3 shows the optimized power distribution on the tube along the length of the tube.
Optimization of three LED plant light tubes
When three LED plant light tubes are arranged on the top of the shelf, after iterative optimization by Matlab software, the distance between adjacent tubes among the three tubes is 210mm. The illumination uniformity value generated by the above three lamp tubes on the light-receiving surface can reach 0.85, and the illuminance distribution of the light-receiving surface is shown in Figure 4. According to the same lamp tube spacing, the LED luminous particles inside the three LED plant light tubes are evenly arranged. Using Tracepro software simulation, the uniformity of the light-receiving surface is 0.53, and the illuminance distribution of the light-receiving surface is shown in Figure 5. After the optimization of the tube particle arrangement, the uniformity of the light on the light-receiving surface is increased by about 60% compared with the before optimization. Fig. 6 shows the power distribution on the lamp tube in the length direction of the optimized lamp tube.
By optimizing the arrangement of LED luminous particles in the lamp tube for plant tissue culture, the uniformity of light on the light-receiving surface is improved, and the optimization method of the arrangement of the luminous particles is introduced with two lamps tubes and three lamp tubes as the optimization object. After optimization, the uniformity of the two and three lamp tube supplementary lighting schemes is improved by about 60% compared with the unoptimized uniformity, reaching 0.79 and 0.85 respectively. The new supplemental lighting scheme can provide more uniform illumination for tissue-cultured seedlings, significantly improve the growth consistency of tissue-cultured seedlings, and is beneficial to the high-quality, large-scale seedling production of tissue culture enterprises, and reduce the production cycle and cost. In addition, the illumination uniformity design method proposed in this article can also be applied to the optimization of flat-panel LED plant light.
The arrangement of high-quality LED plant lamp’s luminous particles is very reasonable. This design will make the light received by plants more reasonable and the light received by crops more uniform. Choose MOKOLight LED grow light and reasonably arrange the lamp beads to make plants grow more healthily.
