Dual Shades are indeed one of the best solutions when you need total light block at times, and semi light filter and privacy for other times. There are two shades installed per opening. One would be blackout and the other light filtering. You choose the color and density. They both can be hidden inside the Fascia aluminum box at the top. Ideal solution for residential media rooms, home theaters, bedrooms, and business conference rooms, schools and hospitals. Side tracks to even reduce further the light on the sides of the opening can be installed if needed.