Plant factory is a kind of efficient agricultural production mode which can achieve crop annual continuous production through high-precision environmental control in the facility. The output per unit area can be more than 40 times of that of open field production. Therefore, it is regarded as an important development direction of food security by countries in the world, especially countries with short cultivated land resources. Everything grows by the sun.

 

 

Sunlight is not only the energy source of photosynthesis and other basic physiological activities, but also the power source of flower bud differentiation, flowering and fruiting. But in plant factories, the light needed for vegetables is illuminated by LED lights.