they seem to block all light in my son's very bright room. Go for an outside mount though, then you won't have the side gaps that are inevitable with inside mount.
Beware, mine had a couple of small cuts in the material, which I fixed by putting a piece of white tape (the kind you'd find in a first aid kit) on the back. It doesn't show agaisn't the back, and it is thick enough that you can't even tell there is a cut.
4 years, 6 months ago
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