With the improvement of agricultural productivity in China in recent years, greenhouses have developed rapidly. However, due to the low winter temperature in the north and the short sunshine time, they cannot meet the needs of crop growth. Although the temperature is higher in the south, the winter and spring are more cloudy and rainy. There will also be insufficient sunshine, therefore, domestic greenhouses generally need to be supplemented with light. In traditional agricultural production, ordinary electric light sources are generally used to supplement the light and the application of different covering materials and other agricultural technical measures, such as the use of monochromatic fluorescent lamps or colored plastic films, and changing the light environment to regulate the growth and development of plants in the facility cultivation environment. These measures have problems of varying degrees, such as lack of analysis of specific spectral components, resulting in impure light quality processing, inconsistent light intensity, close to or even lower than the light compensation point of plants, and low energy efficiency of the illumination light source. Plant lights can solve these problems, and are especially suitable for artificial light-controlled plant facility cultivation environments.
One,
The working principle and use of plant lights
When plants photosynthesize, they need red and blue light instead of green light. Therefore, the light environment is one of the important physical environmental factors indispensable for the growth and development of plants. The light source of plants is mainly based on the photosynthetic curve of plant photosynthesis and the percentage of light absorbed by photosynthetic pigments to determine the composition and ratio of light quality to provide good plants. Light environment. At present, the mainstream plant lights are LED plant lights and fluorescent plant lights.
After application tests, the wavelength of the plant light is very suitable for the growth, flowering and fruiting of plants. Generally, indoor plants and flowers will grow worse and worse with time. The main reason is the lack of light irradiation. The LED lamp suitable for the required spectrum of plants can not only promote their growth, but also prolong the flowering period and improve the flowering of the flowers. quality. So it can be summarized into three points:
1) As a supplementary light, provide supplementary light for plants in the case of insufficient external light, and maintain sufficient light for plant growth.
2) Extend the light time. For mid-day and long-day plants, natural light cannot provide enough light time. Plant lights can extend the light time to achieve the best photoperiod of plants.
3) Use greenhouses or plant laboratories. Replace natural light and promote plant growth.
two,
Various performance comparisons
We use professional equipment to measure the luminous flux and luminous efficiency of fluorescent plant lights (as shown in Figure 1) and LED plant lights (as shown in Figure 2), as well as the red, green, and blue light occupancy data, and conduct a specific comparison and analysis. The specific comparison results are as follows .
2.1 Appearance comparison
We can see from the comparison between the fluorescent lamp type plant light (as shown in Figure 1) and the LED type plant light (as shown in Figure 2) that the shape of the fluorescent lamp type plant lamp is a ring, because only the downward emitted light can effectively illuminate the plants Therefore, its effective luminous efficiency and luminous flux are only about 50%.
2.2 Comparison of luminous flux and luminous efficiency
The luminous efficiency and luminous flux of the fluorescent lamp type plant lamp are slightly higher than that of the LED type plant lamp, but because only the downward emitted light can effectively illuminate the plant, the real luminous effect and luminous flux of the fluorescent lamp type plant lamp are only its own About 50% of it.
Through experiments to compare the luminous efficiency and luminous flux of the fluorescent lamp type plant light and the LED type plant light, Table 1 is obtained. It is obvious that the effect of the LED type plant light is better.
PARAMETERS
