Dec 09, 2019
Introduction of plant growth lightsThe meaning of the interior lighting of the greenhouse. What we need to know is that the growth rate of plants depends on the light intensity, that is, the amount of radiant energy absorbed by the plant surface, not the number of light sources. Many people ask, what is the meaning of greenhouse interior lighting, how to do it, and what kind of light source should I use? The significance of lighting inside a greenhouse is to extend enough light intensity throughout the day. It is mainly used to grow vegetables, roses and even chrysanthemum seedlings in late autumn and winter. Greenhouse lighting has a huge impact on growing season and seedling quality. Generally, for tomatoes, the light will start after the plant seedlings grow two cotyledons, and continuous light for 12 days can reduce the seedling preparation period of 6-8 days. But more than 24 hours of light can cause plant growth disorders. The most suitable lighting time is 8 hours per day. On cloudy and low-light days, artificial lighting is a must. Give crops 8 hours of light at least at night, and the time of day should be fixed. However, the lack of night rest time can also cause plant growth disorders and reduce yield. For tomatoes, the most effective light time is from dusk to midnight, from 16:00 to 24:00, or from midnight to early morning from 24:00 to 8: 00. So light 8 hours and rest 8 hours. In practice, we should provide light to plants throughout the growing period, from seedlings to planting. In the last period, we should reduce the light to 6 hours a day or even stop for 2-3 days. If the light conditions are poor and the time required for the planting period is long, the light usually lasts for one month. Selection of Light Sources When using artificial light sources, we must choose natural light that is closest to meeting the photosynthesis conditions of plants. The light source should have the following characteristics: 1. Efficiently convert electrical energy into radiant energy 2. Achieve 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 that of plants Physiological requirements, especially in the effective spectral region of photosynthesis. The comparative intensity is in the photosynthesis effective area, and among various artificial light sources emitting horizontally, the energy conversion effect of the sodium lamp is twice as high as that of the mercury lamp. Sodium lamp is the most effective light source in the greenhouse that affects plant photosynthesis and correct growth. The tubular sodium lamp can reach 150lm / w high-efficiency radiation, which is currently the most favorable choice for the growth of various crops. Increasing the pressure of sodium vapor in the ceramic arc tube can expand the spectrum of blue and red light, which is the high-range wavelength sought. Among the high-pressure sodium lamps for application and horticultural products, we believe Chin-up Grow light will be your best choice. Their difference lies in increasing the higher 0-40% blue light range and activating the plant’s chlorophyll. In order to obtain the highest radiation energy, all sodium lamps are equipped with a reflective layer on the inside of the lamp cover. At present, most domestic factories generally use sodium lamps as street lamps for plant use, and export them, causing a lot of losses to users.