Like said, movable objects get their lighting by sampling one or a few lighting samples (Show > Visualize > Volume Lighting Samples). No matter what, you can’t get it to feel grounded in the scene without all the AO and precise lighting that you can easily get on static objects.
“Light as if Static” will mess things up for you. The areas where the wall and door meet will be completely black, and the two separate rooms will clearly have shadows and lighting from a closed door. You may have to use a different colored material to fake what you want.