Thank you all for your support - appreciated!
Another issue:
For our product, we must have a pure clear white background each time. The product itself is always in focus and must of course be illuminated cleanly and balanced.
In this example, I'm trying to cleanly light an IKEA table on a white background (it must have shadows). Later I will have to render a white Ikea table.
However, with the light settings it will be overlit. I tried to exclude the table from the individual light sources with render tags or with the material of the table, to reduce the reflection. No chance.
Ideally, I need a pure white set where I can always illuminate the object with a different light source without it being overlit.
This way I could always illuminate the products/objects sepparat and still have a white background.
I think the problem at the moment is that the light sources are generally also responsible for the background being pure white. Somehow the lighting for the background as well as for the product must be separated...?!
Gladly also against payment :-) - I despair
Thanks all and take care