I was at Prediger in Frankfurt. However, I did not do a lighting plan. That would have cost about 2000 EUR and taken about 3-6 weeks, as they also create a detailed CAD drawing there and are apparently quite busy, and it involves several appointments. Since we needed the result this week, that was not an option. I only had a consultation appointment. As input, I had the floor plan as well as the pictures and plans of the bathroom, kitchen, and fireplace. Based on that, we went through the rooms one by one, and in between he showed suitable lamps and effects. The whole thing took about 1.5 hours and was free of charge. I found the consultation extremely helpful and very competent, so I would recommend the place. I did the drawing myself at home; in the store, we only sketched with a pencil on the floor plan, and I took notes on the distances, etc. We also discussed topics like dimming, orientation, and groups to be switched together, but I have not included those in the plan. So I was really positively surprised...
One more note about the [dosen]: meanwhile, I have the answer from the builder; the HaloX 180 1282-71 will be installed.