Hi pencilart,
I have discovered what your problem is.
Here is a new "Fast" render (I used the new lights and new AdvancedRenderingMini-1.6.1 for this)
The problem was caused because you had a tiny height wall behind the cupboards, in the bottom right hand corner of your build, so that made the ceiling lights appear very low because the ceiling slopped down to the floor.
You also had about 3 walls for every wall of the building, not sure how that may have happened?
Looking at the name of the furniture lights you seem to have added the BasicPlusExtraLights furniture directory as a single model, so you wouldn't see the light bulbs in your furniture list, plus one of the extra lights you added was at a height above the ceiling.
Here is your model, I have left all the extra walls and added 2 light bulbs.
http://rapidshare.com/files/419477626/kitchen.sh3d
When you added the BasicPlusExtraLights did you double click the file to add it to your furniture list?
Hope this helps!
db4tech
Edit:
I see Emmanuel beat me to it while I was preparing my post!
