Hi guys!
Any tips on how to solve this kind of light leak?
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Howdy @HighBreed, one way to stop that light from leaking is to affix some ducting for the intake and have the ducting long enough with enough bends so the light can’t escape. Hope that helps. Many blessings and much love
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Some black landscaping fabric would block most of the light and still allow air to pass if that’s important to you. Otherwise I’d duct tape a piece of cardboard over it and just flip it out of the way during lights on.
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Something like this for under the door.
Use this around the door edge
Put one of these on the outside and tubing on the inside duct taped(afix however you want) in a coil shape.
https://www.homedepot.com/p/Master-Flow-6-in-Fresh-Air-Vent-FAV6/100396938
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Cardboard and duct tape
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Yeah forgot to mention that this is the only intake for that room to get fresh air inside…we blow the air out in the only window in that room…
The quality of the door itself is also bad and they used transparant silicone as a sealing…
I was thinking of screwing a duct on the inside of the room with a s shaped tube on it…
We bought a black curtain to place over the complete door but not sure about getting enough fresh air inside of the room…
This time of year i’m not worried about it getting to hot in the room because outside it’s not getting over 20°c
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For the hole, @FirstCavApache64 had the right advice. I’d do something like this and do a hook up high so it’s hanging and doesn’t drag when opening the door.
Edit, meant @Sbeanonnamellow for the ducting, but landscape fabric is great as well since it doesn’t stop airflow
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tape 1 or 2 layers of green-scrub pads over that vent. get a weather strip for the bottom of the door.
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I would get something like this, and duct tape it over the hole. The black filter does a good job at blocking light.
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@Flower Great minds think alike lol. AC infinity sells rolls cheap. You can cut to size and double layer. Keep some around for other needs. Cheers !!!
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I do the same thing, cut it to size. I have some over a vent hole right now.
Works great.
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Maybe one of these dryver vent covers that are angled. Stop the light from coming through but will still allow airflow
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Build a box with baffles, like this.
Use cardboard & tape. Done & cheap!
Also use a cheap door sweep for under the door as someone suggested above.
@HighBreed
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Couple right angles should sort you out
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Put a hose in the door both ends aiming towards the ground but not touching the ground… should conceal it to that very small area below… could even run it inside a cardboard box etc… @HighBreed
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What’s outside that door? --can you just turn that light off? 
[They make air vents that block light on its own]
You could just throw a blackout curtain over it too.
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Like most have said, flex duct is the simplest way. To attach it to your door, they make a stick on collar. The sticky side goes on the door, and you fit the flex duct right on the other end. Don’t forget to pick up a roll of foil tape to seal ALL your seams…especially on the door around your collar!!
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That’s the hallway,that door also is right across the front door of the appartment 
the problem is not really the light coming out of the door,more like the hallway light/ daylight from the livingroom interrupting the flowering room while the lights are out
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Howdy @HighBreed, is the room you’re taking the picture from the intended garden space? I assumed the light showing through was from the garden space.
If the room you’re taking the picture from is your intended garden space you can build a frame out of 1x2 dimensional lumber, with a removable cross brace and affix black and white “panda” poly sheeting to create a light proof frame just inside the door. It looks to open outwards from the intended garden space so should work well.
Do you need the vent for airflow? If so, the aforementioned ducting with enough bends will compliment the temporary frame and panda paper setup nicely.
For the frame, 1x2’s set into either the studs that makeup the door frame with small screws or into the drywall with anchors. Just a few, 3 on the tall sections running vertical, and 2 on the short sections running horizontal should work well. From there you can staple the panda paper to the 1x2’s to your hearts content and the only patching that will need to be done afterwards is the spots where you affixed the 1x2’s at. Then add a zipper entryway to the black and white poly. I like to recommend a little hammer to get the staples nice and flush if any didn’t sink flush, and some tape on top of the staples to prevent unintentional rip out because the black and white poly can stretch with a lot of negative pressure from an exhaust fan. With some brackets affixed to the vertical sections you can place a removable brace in the middle that runs horizontal if there’s a lot of negative pressure from extraction fans otherwise it may balloon up a good bit from the pressure created by the fan. The middle brace removable so you can enter and exit easily. Hope that helps. Many blessings and much love
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