What we need to know about the significance of lighting inside the greenhouse is that the growth rate of plants depends on the light intensity, that is, the amount of light radiation energy absorbed by the plant surface, not the number of light sources. Many people ask, what is the significance of lighting inside the greenhouse, how to do it, and what kind of light source should be used? The significance of lighting inside the greenhouse is to extend enough light intensity throughout the day. Mainly used for growing vegetables, roses and even chrysanthemum seedlings in late autumn and winter. Greenhouse lighting has a huge impact on the growth period and seedling quality. Usually, for tomatoes, light will start after the plant seedlings grow two cotyledons. Continuous light for 12 days can reduce the seedling preparation period by 6-8 days. But more than 24 hours of light will cause plant growth disorder. The most suitable light time is 8 hours a day. Artificial lighting is a must on cloudy and low-intensity days. Give crops at least 8 hours of light per day at night, and the time of day should be fixed. But lack of nighttime rest can also lead to disordered plant growth and reduced yields. For tomatoes, the most effective light time is from dusk to midnight, 16:00-24:00 or from midnight to early morning 24:00-8:00. This is 8 hours of light and 8 hours of rest. In practice, we should provide light to plants throughout the growing period, ie from seedling to colonization. In the last period we should reduce the light to 6 hours a day or even stop it for 2-3 days. If it takes a long time to the colonization due to poor light conditions, the light usually lasts for a month. The choice of light source When using artificial light sources, we must choose natural light that is closest to the conditions for plant photosynthesis. The light source should have the following characteristics: 1. High-efficiency conversion of electrical energy into radiant energy 2. High radiation intensity within the effective range of photosynthesis, especially low infrared radiation (thermal radiation) 3. The emission spectrum of the bulb is in line with the plant's Physiological requirements, especially in the effective spectral region of photosynthesis. Compared with various artificial light sources whose intensity is in the effective region of photosynthesis and emits horizontally, the energy conversion effect of sodium lamp is twice as high as that of mercury lamp. Sodium lamps are the most effective light sources in the greenhouse that affect plant photosynthesis and correct growth. Tubular sodium lamps can achieve high luminous efficacy radiation of 150lm/w, and are currently the most favorable choice for the growth of various crops. Increasing the sodium vapor pressure in the ceramic arc tube broadens the spectrum of blue and red light, which is the high range of wavelengths sought. Among high pressure sodium lamps for applications and horticultural products, we recommend PLANTASTAR(OSRAM), SON-T AGRO (PHILIPS), LUCALOX XO(GE). Their difference lies in boosting a higher 0-40% blue light range, activating the plant's chlorophyll. In order to obtain the highest radiant energy, all sodium lamps are equipped with a reflective layer on the inside of the lampshade. At present, most factories in China generally use sodium lamps as street lamps for plants on the spot, and export them, causing a lot of losses to the majority of users.
What are the functions of red and blue LED grow lights? Solve?
For plants, the wavelength of red light is mainly concentrated at 630~660nm, and its function is to help plants bloom and bear fruit, and the wavelength of blue light is mainly concentrated at 450~470nm. Its function is to help plants grow stems and leaves. Therefore, the phenanthrene plant growth lights on the market mainly use red Blu-ray. In addition, for living things, red light is mainly infrared light. At present, the general regular hospitals use infrared light to kill viruses, mainly for the healing and treatment of wounds. Blue light is mainly to help sleep and beauty and whiten teeth. At present, there are many related products on the market, most of which are concentrated in foreign countries, and the domestic use is still relatively small. Meet the special needs of various fields. With the continuous improvement of science and technology, people's research on LEDs has continued to deepen, and LEDs have gradually benefited human beings. Due to the luminous characteristics of LEDs, scientists can accurately control the color and wavelength of light.
