If you are planning on using flash then the lighting you select for the room doesn't matter as you can just cut that out. Just make sure it's flush fitting so it doesn't cast any shadows.

If you are shooting the same shot over and over again, you may want to look into not using flash at all. There is nothing wrong with shooting longer exposures and using tungsten/HMI's you may have more problems with controlling the colour using that method though.

How good are the people taking the pictures, are they pros ???

Cheers

Cris