Not sure what country you're from, but "blockout blinds" are likely what you're looking for. They blockout (essentially) all light and are operated like normal blinds.
Have never seen blockout blinds which stop enough light during the day - they leak enough to be comparable to a reading lamp, since outdoors is so bright.
I used to work night shift and tried a few different things. Maybe the super-premium blinds block more light, but IME the most effective solution is blackout curtains. You'll need to hang a curtain rod that's wider than the window and get curtains that are wide enough, ideally just a single curtain rather than 2 if your window is narrow enough.
Mounted internal to the window frame, not external, works better for me. Internal can ride tighter to the window, so light can't go out the edges. With external frame mounting, you need much wider shades.
If the fabric itself isn't blocking light... You need better material. I have only ever had problem with light leakage in the edges, not in the fabric material.
I believe 'blackout thermal shades' is what to look for.
I have that. They have a magnet that keep the middle, where they connect light-tight.
Installation is key - they need to be oversized, covering the entire window AND the trim, and they need to be carefully installed so that they touch the trim.
danielheath|9 months ago
zrobotics|9 months ago
sokka_h2otribe|9 months ago
If the fabric itself isn't blocking light... You need better material. I have only ever had problem with light leakage in the edges, not in the fabric material.
I believe 'blackout thermal shades' is what to look for.
ars|9 months ago
Installation is key - they need to be oversized, covering the entire window AND the trim, and they need to be carefully installed so that they touch the trim.
theoreticalmal|9 months ago