Miriam:(posted 8495 days ago)When workng in bar-light situations, you are going to be dealing with everything from low light to no light. Like the others have posted, you will need to use the really fast films. Depending on the situations you encounter, you might have to use extremely high film speed ratings, maybe as high as 6,400, 12,500, or even 25,000. This can be especially true if you aren't working with extremely fast lenses.
Its impossible to give specific exposure recommendations. The conditions will vary tremendously. You'll just need to do some experimenting in order to determine what will work and what you can expect. Shoot a lot and develop it forever, see what you get, and determine any necessary adjustments in film speed ratings and/or development. Shoot some more and zero in on what works.