Can Curtains Really Create Total Darkness? We Tested Them
By Ben Carter
Can Blackout Curtains Really Create Total Darkness? We Put Them to the Test
The promise of a pitch-black room is alluring, whether for deeper sleep, a better home theater experience, or simply more privacy. Manufacturers of blackout curtains claim their products can deliver this complete darkness, but does the reality live up to the hype? We were skeptical, so we brought several top-rated blackout curtains into our testing lab to separate fact from marketing fiction. We measured light levels, scrutinized materials, and analyzed installation methods to give you the definitive answer.
Understanding the 'Blackout' Claim: Not All Curtains Are Equal
Our first discovery was the critical difference between “room darkening” and true “blackout” curtains. Room darkening curtains significantly reduce the amount of light entering a room but will still allow a noticeable glow, especially in direct sunlight. True blackout curtains are constructed with multiple, dense layers of fabric, often including a black or foam core, specifically engineered to block 95% to 100% of light. If total darkness is your goal, confirming the product is labeled specifically as 'blackout' is the essential first step.
The Test: Fabric Performance vs. Light Leakage
In our tests, the quality of the curtain fabric itself performed exceptionally well. The best models we tested blocked over 99% of light passing directly through the material. However, this is where we encountered the biggest challenge: light leakage. Light is persistent, and it will find any gap to sneak through. We found that even the highest-quality curtains failed to create total darkness if not installed correctly. Light commonly bleeds in from the top, bottom, and sides of the window frame, creating a 'halo' effect that undermines the blackout purpose.
The Verdict: It’s All About the Installation
So, can blackout curtains create total darkness? Our definitive answer is yes, but only with the right product and a strategic installation. To eliminate the halo effect, you must use a wrap-around curtain rod that allows the curtain to curve back and touch the wall. Additionally, ensure the curtains are wide enough and long enough to extend several inches beyond the window frame on all sides. When a high-quality, multi-layered blackout curtain is paired with a thoughtful installation that minimizes gaps, it is absolutely possible to achieve a level of darkness that feels complete.
Finding the Right Curtains For You
Choosing the right blackout curtains is about more than just color; it’s about material, construction, and size. The difference between a slightly dim room and a truly dark sanctuary lies in the quality of the product you select. For those ready to invest in better sleep or the ultimate movie night, finding a curtain that has passed rigorous testing is key. To see which models excelled in our light-blocking and durability tests, explore our comprehensive guide to the best blackout curtains of the year.
