This dark system is produced in the heavy industry zone in northern China. When the dark curtain is closed, the room is 100% dark. The dark system uses a geared motor to open and close, which effectively increases the service life, which is five years longer than the service life of ordinary motors, and saves future maintenance costs. The dark system can artificially control the photosynthesis of plants and the time that plants receive sunlight, thereby accelerating plant growth, shortening the growth cycle, and increasing greenhouse productivity. The greenhouses produced by our company are of high quality and low price, which ensures that buyers use limited funds to make the most valuable investment.