Spotlights would be your fill lighting, they have direction and can be restricted.  However, to use them correctly, you may need to turn off cast shadows on the fixtures. 

In regards to the ceiling, if I were considering IDL, I would make it visible again, position a point light high and centered within the room and render.  Just imagine your own kitchen where your light fixture would be located.  That is as close to real lighting as you would get unless you are accounting for extra outdoor lighting coming in through a window off scene.