Room Darkening: Allows a small amount of light to enter the room for a greater sense of privacy, as inside objects appear as shadows. 3/8" Double Cell Cellular Shades provide superior insulation and sound absorption. A wide range of solid colors in room darkening fabric. View additional Northern Lights colors in light filtering. Street color white. Lighter fabrics let more light into the room. For absolute light blocking see Bali's blackout style..