Lighting setup for the main room is almost done. I plan to transfer the setups that have been created (as well as a few of the assets that needed their UVs improving) to the other scene files in order to save time as the rooms do not change that much.
To save on materials, some texture files were combined using a layered texture plugin that with some alteration to the UV layouts allow for multiple models to use one material easily, saving on using repeat materials and repeat colours. Getting a better handle on the surface shader also made its installation much handier, and the effect I can get out of it feels much more natural.
Like with other assets, the lights will need to be grouped with the model, so that when the scale of the model changes, they change to remain in place. What I'll still need to keep in mind is how much will the various lights change as they are re-positioned and re-scaled. A final outcome is close, just a little more time and attention needed and I should be ready to start on final compositions.