The darkening effect is fully fulfilled - that's what I bought it for. You should make sure that the curtain rod is long enough so that no light comes in to the side. In any case, the curtain doesn't let anything through. The curtain, chosen in green, comes out a little greener than pictured, but hung it looks high-quality and elegant. And this green radiates a calmness - right for the bedroom. In terms of color, it also matches all other colors. Although the curtain was very neatly packaged, it was quite cuddly and doesn't hang out.