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Our office has some battery backed up Fluorescent lighting that no
longer work. Each lighting fixture has three 4' Fluorescent tubes.
When the red button is pressed, the center tube will light up, so it
seems to indicate that power is present. Is the ballast bad or
something? How to convert these battery backed up Fluorescent lighting
fixtures to be the normal kinds which is on a switched circuit? We
want them to be off when power is cut.

Thanks

Many of them will have a seperate ballast for the two outside tubes. The
center tube will have its own ballast with an internal battery. There is
usually a connector between two of that ballast wires that will disconnect
the internal battery. I do not recall if it will still let the ballast work
as a normal ballast.

If not, you will have to replace that center ballast with a single tube
ballast, or maybe a newer electronic type that will operate the 3 bulbs and
do away with the other two tube ballast.