×
My apartment is on the first floor, facing a sidewalk. At night, people walk by constantly. Dogs stop to sniff my window. Kids peek in. Delivery drivers glance over.
For two years, I kept my curtains closed the second the sun went down. But I hated feeling like I lived in a cave. I wanted natural light during the day — and absolute privacy at night. Without having to touch anything.
So I bought smart venetian blinds from Mingchen Sunshade. Then I did a very nerdy thing: I went outside at night with a flashlight and a friend to test exactly how much you can see through them.
Here’s what I discovered — and what you need to know before trusting your privacy to any blind.
Short answer: It depends entirely on three things:
The fabric type (blackout vs. light‑filtering)
The slat angle
How bright your indoor lights are
I tested all three. Here’s the breakdown.
My bedroom has blackout fabric (solid back coating). At night, with the slats completely closed (tilted shut), I went outside with my friend. We stood about 10 feet from the window. Indoor lights were on at normal brightness (a ceiling light and a nightstand lamp).
Result: We could see almost nothing. A faint glow around the edges of the window frame. No shapes. No movement. No detail. The window looked like a dark rectangle.
I called my friend inside. Then I stood outside while she walked around the room. Nothing. Complete privacy.
Verdict: Blackout fabric + slats fully closed = totally private at night.
My living room has light‑filtering fabric (thinner, lets soft light through during the day). Same test. Lights on inside. Slats fully closed. Went outside.
Result: We could see silhouettes. Not facial features. Not colors. But definitely a human shape moving around. If someone stood still near the window, we could see their outline.
My friend waved her arms. I could see the motion clearly. It wasn't like a clear window, but it was enough to make me uncomfortable.
Verdict: Light‑filtering fabric + slats closed = partial privacy. Good enough for a living room maybe, but not for a bedroom or bathroom where you really don't want anyone seeing your silhouette.
This is how most people leave their venetian blinds during the day — slats angled down slightly. At night, with lights on, I tested this too.
Result: We could see directly into the room. Through the gaps between slats, we could see furniture, lamps, even the pattern on my rug. If someone had been sitting on the couch, we'd have seen their face clearly.
Scary, right? Because I used to leave my blinds like this at night, thinking "they're closed enough." They were not.
Verdict: Never leave slats tilted open at night if you care about privacy. Ever.
I discovered something interesting. When slats are fully closed, they angle either upward or downward depending on how you last tilted them.
If the slats angle downward (the outside edge is lower than the inside edge), people outside see more reflection and less of the room. If the slats angle upward (outside edge higher), they see more of the room's interior.
My Mingchen blinds have a "privacy close" setting in the app. It tilts the slats to a specific angle (slightly downward) that maximizes outside reflection. I use that every night.
Even with perfect slats, light can leak around the edges of the blind. I tested that too.
On my bedroom (blackout fabric + inside mount + no side channels), there was a tiny 2‑3mm gap on each side of the blind. At night, with lights on, I could see a thin vertical line of light from outside. But I couldn't see into the room through that gap — it was too narrow.
On my living room (light‑filtering fabric + outside mount + no side channels), the gaps were larger (about 5‑8mm). I could actually see a sliver of the room through the side gap. Not enough to identify someone, but enough to see movement.
Solution: If you want maximum privacy, order side channels. They block side gaps completely. I didn't, and I regret it for the living room.
One weird privacy concern I hadn't thought about: the remote control has a small LED that blinks when you press a button. At night, from outside, you can see that blink through the slats. It's tiny — not a real privacy issue — but I noticed it.
I solved this by using the app at night instead of the remote. No blink.
Based on my tests, here's my honest advice.
For bedrooms, bathrooms, or any room where you absolutely need privacy at night:
Buy blackout fabric and keep the slats fully closed after dark. Don't rely on light‑filtering. The $20‑30 extra per blind is worth the peace of mind.
For living rooms, kitchens, or rooms where you don't change clothes:
Light‑filtering fabric is fine — as long as you fully close the slats at night. But remember: people can still see silhouettes. If that bothers you, go with blackout.
For any room: Never leave slats tilted open at night. Close them all the way. And consider side channels if you have inside‑mounted blinds with visible gaps.
Privacy during the day is the opposite problem. When it's bright outside and darker inside, people outside can't see in easily — but you can see out.
With light‑filtering fabric during the day, I have perfect privacy. I can see the sidewalk clearly, but people walking by just see a soft, diffuse surface. No details.
With blackout fabric during the day, the room is dark. If you want daytime privacy and light, choose light‑filtering. If you want a dark room (home theater, nursery), choose blackout.
The first week I had smart blinds, I set a schedule to close them at 9 PM. But I forgot to check the slat angle. The schedule just closed them to whatever angle they were last set at — which was tilted open from the afternoon.
So at 9 PM, the blinds "closed" but were still tilted open. People outside could see in. I didn't notice until a neighbor mentioned "nice lamp" the next day. Embarrassing.
Fix: In the Mingchen app, you can set a "closed position" that specifies both the blind being down AND the slats fully shut. I set my nightly schedule to use that. Problem solved.
Smart venetian blinds can give you excellent nighttime privacy — but only if you choose the right fabric, close the slats all the way, and address side gaps.
Here's my quick checklist:
✅ Buy blackout fabric for bedrooms and bathrooms
✅ Use the "privacy close" slat angle (slightly downward)
✅ Order side channels if you have inside‑mounted blinds
✅ Set your nightly schedule to fully close slats, not just lower the blind
❌ Never leave slats tilted open after dark
After a year of testing, I sleep fine knowing that my bedroom window is a dark rectangle to the outside world. My living room? I still get a little nervous with light‑filtering, so I'm adding blackout there too.
Don't learn the hard way like I almost did. Test your own blinds from outside at night. You might be surprised.
— Nina, street‑level apartment dweller and Mingchen Sunshade customer
Get Your Free Sample Catalog: https://www.86douglas.com/contact-usRequest our physical sample catalog to feel the texture and compare colors in person.
Need Personalized Advice?Contact our customer service team for one-on-one professional answers tailored to your specific project needs.
Copyright © 2025 Weifang Mingchen Sunshade Technology Co., Ltd. All Rights Reserved.
EN
