In recent years, due to the promotion of market demand, greenhouse is widely used in winter to produce flowers, fruits, vegetables and so on. However, due to the short light time in winter, crops in greenhouses generally have insufficient light, which seriously restricts the yield and quality of crops. Farmers are in desperate need of a device that can supplement the light for facility planting. The newly developed LED grow light have the advantages of long life, low energy consumption, adjustable spectrum, etc., and are increasingly favored by people in the regulation of facility light environment. So what is LED fill light? How does it work? What are the benefits of using LED grow lighting for the growth and development of vegetables and fruits?

The wavelength of red and blue light of LED grow lighting supplementary light is precise and controllable, and the light ratio suitable for different plants and different growth stages can be customized to solve the problem of lack of sunlight in the greenhouse in winter, promote the chlorophyll needed for plant photosynthesis, improve the sweetness of fruits and reduce the occurrence of diseases and insect pests.

Vegetable seedling is an important link of facility agriculture. Due to insufficient light in facilities, seedlings are prone to overgrowth, which further affects vegetable growth, flower bud differentiation and fruit development, and ultimately affects their yield and quality. LED grow lighting filling lamps have unique light filling advantages. Studies have found that red and orange light can significantly speed up the development of plants, facilitate the accumulation of dry matter and the formation of plant organs, cause plants to bloom earlier and set seed, and play a leading role in increasing plant color and yield. The experiment showed that cucumbers grown in the greenhouse were irradiated by the combination of red and blue LED grow lighting, and the results showed that cucumber seedlings cultivated by LED grow lighting had thicker leaves, darker colors and stronger plant growth.

The installation of LED grow lighting supplement lamp should be scientific in order to effectively improve the light utilization rate of plant light. In order to ensure the light intensity of plants, plant light filling lamp should be placed as far as possible directly above the plant, its distance should be set according to the power of plant lamp. The closer the distance between general plant lamp and plant, the higher the utilization rate of light. Use LED grow lighting to fill the light, because LED heat energy is very little, will not burn the plant, can be irradiated from a close distance, the closest distance can be 10 cm. Generally to the plant lamp with less than 8W power, irradiation distance is about 0.5 meters, the plant lamp with more than 8W power, irradiation distance can be between 0.7-1 meters.