Thank you for the tips. I have decided to illuminate only the hallway (7m long) with 5 spots, spacing would be 1.16m, and the countertop/sink (2.1m) with 2 spots. Spacing 70-80cm. Otherwise, central ceiling lights and in the shower an additional outlet for a splash-proof ceiling light. In the living room, of course, 2 ceiling lights each centered. While browsing, I found ceiling lights that can be adjusted via remote control, from 2800-6000K, dimmable, 270° beam angle, 128 LEDs, 45W, 712-4000 lumens. Also available with 90W and 9000 lumens. If that's not enough, then I don't know. I think it's great that you can vary the color temperature and brightness. And if I don't like it, I can always suspend the ceiling later. It shouldn't be more expensive than 25 core drillings.