light proof

How does one make the intake and outtake holes of a small grow box light proof? Isn't it true that even if you use a curved pipe out of the box, light will still get out/in?

90% uv protective black shade cloth. 2 layers

Use some ducting or put in 90* elbow pipe fittings

Combine both shade cloth and a 90* bend

see if this helps

https://www.rollitup.org/grow-journals/122142-offgridgrowers-journey-iss-vsog-stadium.html

last post is about light traps