When Plants Need The LED Grow Lights?

I’m sure you all know that plants need photosynthesis to grow, and one of the most powerful mediators of all is light. Because the earth’s rotation and the cause of the sun, the plant in the spring, summer, autumn can access to adequate illumination, but in winter, day short night, unable to get enough sunlight to grow plants, plus the widespread use of greenhouses, light of the demand is higher and higher, so is the lack of natural light as the fill light artificially to provide the required the plants under the condition of light, to promote their photosynthesis to! In the absence of light, plants usually need to use the plant lamp to give him enough light so that he can grow better.