It does block a lot do the lights. Light escape through the edges but that doesn't bother us. It blocks out enough light for us to sleep in and it does it job. The pull up and down is easy and it was really easy to install. I'm so glad I didn't pay anyone to come install it. I had a wide 70" double window so we got two 35" to place next to each other fitted perfectly. It came a little smaller so it fits without having to squeeze in, so a little bit of gap but not significant.Worth getting if you are contemplating.
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