This is the nanny state gone-wild. The nanny knows you are not capable of making good lighting decisions on your own, so they have been made for you.
The code for lighting dictates exactly what type lighting and switches you can have in every room and exterior lighting too.
My favorite is the requirement for a florescent fixture in the bathroom. Never mind the florescent fixtures look like crap.
You're thinking you'll just put a CFL in a in a regular light socket, it's florescent and uses the same power. Problem solved right in a perfectly reasonable way, right? Wrong.
Nanny knows you will misbehave, and it's too easy to replace it with a non-CFL when the inspector leaves. The bathroom fixture has to be a purpose made florescent with built in ballast.
Most people don't know about this code, until they do an addition or build. you then discover lighting decisions are no longer yours to make.
This is called title 24 and somehow this got passed in 2005 with little public awareness. If people knew this was going on, it would have never passed.
here it is:
http://cltc.ucdavis.edu/images/news/Title24/lighting-design-guide-version-2.pdf