I've had to put a layer of electric tape, sometimes two of them, on some of those just to get the bedroom to a level where it's dark enough to sleep in comfortably.
They're so bright, you can see the damn blue circles on the ceiling. Blue moon rising, invited by no one.
I once bought one of those alarms that brighten along with the pattern of natural sunlight in the morning (and dim in the evening), as I don’t get much natural light in my bedroom. The time display on it was so unbelievably bright at its lowest setting that my sleep was worse until I piled stuff up in front of it. I don’t even bother with it anymore.
Renting, I'd want something I can temporarily attach to arbitrary pre-existing blinds. On reflection, there are several types one might encounter but I'm particularly thinking of the "twist stick to adjust horizontal slats" style. (As opposed to "loop of chain controls angle", or "fully unroll from top".)
I think there was a Show HN some months back where somebody 3D printed a mount so that the twist-stick could be slotted in at a slight angle.
They're so bright, you can see the damn blue circles on the ceiling. Blue moon rising, invited by no one.