Facilities Gardening lighting technology is mainly used in two aspects:
One, in the sunshine less or sunshine time is short as a plant photosynthesis supplementary lighting;
Second, as the plant photoperiod, light form built-in induced lighting.
1, LED as a plant photosynthesis supplementary lighting research Traditional artificial light source to produce too much heat, such as the use of LED lighting and hydration system, the air can be recycled, too much heat and moisture can be removed, the energy can be Efficient conversion into effective photosynthetic radiation, and ultimately into plant material. The results show that the use of LED lighting, lettuce growth rate, photosynthetic rate increased by 20% or more, the LED used in plant plants is feasible. It is found that compared with fluorescent lamps, the mixed-wavelength LED light source can significantly promote the growth and development of spinach, radish and lettuce, and improve the morphological index. The biosynthesis of sugar beet can be the largest, the betaine accumulation in hairy root is the most significant, The highest sugar and starch accumulate. Compared with the metal halide lamp, the anatomical morphology of the pepper and basil seedlings grown under the wavelength LED was significantly changed, and the photosynthetic rate of the plant increased with the increase of the optical density. Composite wavelengths of LEDs can cause the number of stomata of both marigold and sage increased. The same time as
2, LED as a plant photoperiod, light form of the induced lighting of a specific wavelength of the LED can affect the flowering time of plants, quality and duration of flowering. Some wavelengths of LED can increase the number of flowers and flowering plants; some wavelengths of LED can reduce the flowering reaction, control the length and flowering peduncle, is conducive to cut flower production and market. It can be seen through the LED control can control the flowering of plants and subsequent growth. The same time as (CELSS) is a fundamental way to solve the problem of long-term manned spaceflight protection. The cultivation of higher plants is an important component of CELSS. The control of ecological life protection system (CELSS) One of the key light. Based on the special requirements of space environment, the light source used in the cultivation of higher space plants must have high luminous efficiency, and the output light wave is suitable for plant photosynthesis and morphogenesis, small size, light weight, long life, high safety and reliability record and no environment Pollution and other characteristics. LED is more effective in converting light energy into photosynthetically active radiation than other light sources such as cold white fluorescent lamps, high pressure sodium lamps and metal halide lamps. In addition, it has the characteristics of long life, small volume, light weight and solid state. , In recent years in the ground and space plant cultivation much attention. The study shows that the LED lighting system can provide a uniform distribution of spectral energy distribution, the energy conversion to the efficiency of the plant light than the metal halide lamp 520 times.
