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What is the difference between "Room Darkening" and "True Blackout" when shopping for blinds?
What is the difference between "Room Darkening" and "True Blackout" when shopping for blinds?
This is a critical distinction that often leads to buyer's remorse. According to expert guides on Factory Direct Blinds, "Blackout" refers to the fabric's ability to block 100% of light from passing *through* the material itself. These fabrics are usually multi-layered or have a specialized coating. "Room Darkening," on the other hand, typically blocks 95% to 99% of light—enough to make a room very dark, but some silhouettes or glows may still be visible through the fabric. However, the most authoritative advice from professional installers is that the fabric is only half the battle. Even with 100% blackout fabric, light will always leak through the "light gaps" at the sides and top of the blind (often called the "halo effect"). To achieve a "true" blackout—suitable for night-shift workers or home theaters—experts recommend "Blackout Side Channels" or "Side Tracks." These are U-shaped tracks that the edges of the blind slide into, physically sealing off the gaps. On Reddit, users often suggest pairing a blackout roller shade with inexpensive "light-blocking strips" or overlapping them with blackout curtains for a "belt and suspenders" approach to total darkness.

