Hi, welcome to Carrara world. In a closed environment try to use lights as the real scene. O good point here is to use IES with your lights, so it can look more natural.

Tube lights are a little strange in Carrara, you need to rotate them so you can really use it. Look at my tutorials about light:

http://carrara.mirocommunity.org/

Range Falloff and Fall Off Rate are you best friend for closed environment.

Follow me at euQfiz Digital