In recent years, the area of facility horticulture has developed rapidly and the light environment control lighting technology for plant growth has attracted attention. Facility horticultural lighting technology is mainly used in two aspects:
When the amount of sunshine is low or the sunshine time is short, LED plant grow lights are used as supplementary lighting for plant photosynthesis.
1. Research on LEDs as supplementary lighting for plant photosynthesis shows that traditional artificial light sources generate too much heat. With LED supplemental lighting and hydroponic systems, air can be recycled, excess heat and moisture can be removed and electrical energy can be efficiently converted into effective photosynthetic radiation and ultimately plant matter.
Studies have shown that with LED lighting, the growth rate and photosynthetic rate of lettuce are increased by more than 20% and it is feasible to use LED plant grow lights in plant factories.
The study shows that compared with fluorescent lamps, LED light sources with mixed wavelengths can significantly promote the growth and development of spinach, radish and lettuce, and improve morphological indicators.
It's able to maximize sugar beet bioaccumulation, maximize betalain accumulation in hairy roots and produce the highest sugar and starch accumulations in hairy roots.
Compared with metal halide lamps, the anatomical morphology of stems, leaves of pepper and perilla plants grown under the wavelength-matched LED change significantly. And as the light density of LED plant grow lights increases, the photosynthetic rate of the plant increases.
Composite wavelength LEDs can cause an increase in the number of stomata in marigold and sage plants.
Certain wavelengths of LEDs can affect the flowering time, quality and duration of a plant's flowering.
Some wavelengths of LEDs can increase the number of flower buds and blooms in plants. Some wavelengths of LED plant grow lights can reduce the flower formation response, and regulate the length of the pedicel and the flowering period, which is conducive to the production and marketing of cut flowers.
It can be seen that the flowering and subsequent growth of plants can be regulated by LED regulation.
Establishing a Controlled Ecological Life Support System (CELSS) is the fundamental way to solve the problem of long-term manned space life support. Cultivation of higher plants is an important element of CELSS and one of the keys is light.
Based on the special requirements of the space environment, the light source used in the cultivation of higher plants in space must have characteristics of high luminous efficiency, output light waves suitable for plant photosynthesis and morphogenesis, small size, light weight, long life, high safety and reliability records and no environment pollution, etc.
Compared with other light sources such as cool white fluorescent lamps, high pressure sodium lamps and metal halide lamps, LED plant grow lights are more efficient at converting light energy into photosynthetically active radiation. In addition, it has the characteristics of long life, small size, light weight and solid state.
Therefore, it has received much attention in the cultivation of ground and space plants in recent years.
Studies show that LED lighting systems can provide lighting with uniform spectral energy distribution. The efficiency of converting electrical energy into light required by plants is 520 times higher than that of metal halide lamps.