What we need to know is that the growth rate of plants depends on the light intensity, that is, the amount of light radiation absorbed by the surface of plants does not depend on the number of light sources. Many people ask, what is the meaning of greenhouse interior lighting, how to do it, what kind of light source should be selected?
The meaning of greenhouse interior lighting is to extend enough light intensity in a day. It is mainly used to plant vegetables, roses and even chrysanthemum seedlings in late autumn and winter. Greenhouse lighting has a great influence on the growth period and seedling quality. Generally speaking, the tomato will start to light after the seedlings grow two cotyledons, and the seedling preparation period of 6-8 days can be reduced by 12 days of continuous light. But more than 24 hours of light is a disorder of plant growth. The best time for lighting is 8 hours a day. Artificial lighting is necessary on cloudy and low light days. At least 8 hours of light should be given to the crops at night, and the time of light should be fixed every day. But the lack of rest time at night can also lead to plant growth disorders and reduced production.
For tomatoes, the most effective lighting time is from dusk to midnight, 16:00-24:00 or from midnight to 24:00-8:00 in the morning. In this way, the lighting will rest for 8 hours. In practice, we should provide light for plants in the whole growth period, that is, from seedling to planting period. In the last period, we should reduce the light to 6 hours per day or even stop 2-3 days. If it takes a long time to reach the planting period due to poor light conditions, the light usually lasts for one month.