Lighting planning and arrangement of LED spots

On the other hand, I have determined the light cones for spots with 90° and 120°, and found that they would overlap well on the floor.

Overlapping on the floor is of little use to you on tables, where the circles are smaller, kitchen, dining table, counter, bathroom. Try to think in terms of LED panels, you have more options with lighting moods and indirect lighting and less glare.

Yes, LED panels, LED strips. Wall lights and here and there also retrofit... that's how you get something proper.

Hello,
thank you very much for your comments and suggestions!

In the gallery area, it is indeed planned to install a nice, large hanging lamp.

The LED panels we know don’t appeal to us design-wise on the ceiling. Not the lighting itself, but how they look on the ceiling.

Therefore, our idea would be to install (sensibly placed) dimmable spots on the ceiling as functional lighting. If I then, as suggested, leave out some spots (in the living area or in the extension of the hallway), wouldn’t it be too dark to reach the recommended 100-150 lumens/m² for the living area, or am I mistaken?

We like your idea of creating atmosphere with wall lamps and strips. For example, we could imagine placing a wall lamp between the dining table and the couch. Additionally, maybe some kind of shelf with niche lighting between the two sliding doors.

Where would the LED strips fit well?

Uplights rely on illuminating a wall and reflecting the light back indirectly. I find that hard to imagine right now. What does the "gallery" on the floor above look like? If there’s no masonry balustrade or a wall, the uplights would only illuminate the ceiling reveal. Or am I missing something?

Above the sofa, the walls in the gallery area go all the way up on the left and right and these would be illuminated.

We like our light cloud in the all-space, Slamp Clizia, 4x E27, the functions are in the bulbs

If I then omit some spots as suggested (in the living area or in the extension of the hallway), it would have to be too dark to reach the recommended 100-150 lumens/m² for the living area, or am I wrong?

I can only recommend Dialux to you. It is free and with 1-2 YouTube videos you can nicely calculate/simulate the light output, lumens, etc. That’s how I simulated my rooms where spots are/were installed. In the bathroom, for example, I came to a completely different arrangement/number than originally planned. You can also simulate quite well which beam angle fits best. At first, I also had the Luxvenum with 120° (which I also tested here), but now I have gone for the one with 60° and am quite satisfied with it.

Consider what kind of light you want to feel cozy and comfortable and what you need functionally. Then think about your places of stay in the house and your expectations of them. I would be surprised if many recessed ceiling lights remain. The recessed ceiling lights in the apartments of our guys are rarely used. They make the room functionally bright but not cozy. Even screen-oriented, partially virtual-living, young adult males notice that.