This is a very informative thread that got buried deep and maybe it should be made sticky.

Now, if I observe correctly, basically a false ceiling is proposed to accomodate the embedded ceiling light without creating a hole on the floor on upper level.

I see there's one issue though on certain house design. A gap between the false ceiling and the upper level floor can be exposed.

Please look at my rendered photos below:



Look at the LEFT side of the photo. How do you guys put an embedded light on the ceiling on the first level without getting the gap (of the false ceiling) exposed?



Same, if we are to put a false ceiling above the painting, wouldn't the gap be exposed?