I have been selling windows on the commercial and residential platforms for over a decade. They are designed to filter out UV light. The same light the our plants love is the same light that fades everything it touches (IE. furniture, paint, carpet, etc), that is why the windows are made the way they are. Greenhouse grass is specifically made to NOT block out those rays. Yes you can grow with it, but it will be kind of like giving your plant red light when it wants blue.