Crystal-diffusion, (abbreviated CD) is the name of crystal-clear glass on one side with a diffused treatment leading the light particles to be broken down into several smaller light particles. The total quantity of light in the greenhouse remains nearly the same. Under normal conditions, the glass gives a hazy, visual impression of light.
As the outside becomes wet then the glass becomes transparent and behaves like a normal glass pane. Extensive research has shown that using diffusion light provides the plants with more active photosynthesis as the light penetrates deeper into the crop.