Medical Plants Growing Cover material :150/200micro PE Film or polycarbonate sheet Size :customized Type : Multi-Span Agricultural Greenhouses Greenhouse size : customized Span width: 30m- 100m/ customized Space between column :4m Gutter height :3m-8m   Commercial light deprivation greenhouse introduction Blackout greenhouse is designed to promote complete darkness at some times, while permitting light at others, and at the will of the grower or greenhouse operator. Blackout greenhouse is composed by hot galvanized pipe as the structure, and two-layer curtains which can create complete light deprivation. Curtains available in a range of thicknesses.   Blackout system: (1)Shading rate 100%. This kind of blackout curtain is suitable for sensitive plants requiring photoperiod control, such as chrysanthemum; (2)The special structure of its double layer material can achieve less than 0.4% of the light transmittance. The light is reflected by the aluminum foil on the surface of the shading curtain. During the light-dark period, unwanted light accumulation can be prevented. Although made of double-layer material, the closed curtain can still be collapsed into a small size, to ensure that the crop in its open to get maximum light. Has a good water permeability, the bottom of the curtain will not form condensation droplets. UV guarantee 5years. (3) gearmotor with control box can open and close the net, including the timer.