If you want to prevent any light from entering to achieve a true blackout effect you will need to cover the gaps to eliminate the halo effect from your windows.
Blackout window covering ideas.
I bought them because they look great during the day when pulled u.
The blackout eztm window cover provides 100 total window black out for night shift workers home theaters napping kids and more.
Dec 28 2016 most window coverings are room darkening and not blackout because the edge of the window covering creates a halo effect of light.
The light blocking panels are often crafted from weightier fabrics such as velvet or feature a hidden lining to provide an additional barrier from the sun.
Blackout curtains blackout curtains are a mainstay in bedroom designs because they block out sunlight and create total darkness that promotes restful sleep.
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