(3 hours ago)Rene Rechthaler Wrote: would the studio way also work for that (assigning luminance to bricks/elements itself)?
-> there are special render-only colors with variable luminance/brightness
Studio uses a cycles fork (blender) for rendering, so if you want the same results you probably better of digging (Deep) into blender editing.
There is a LDraw import plugin for blender and LDCad offers a glTF export you could also use to import into blender.