macandal,
Balancing ambient and flash lighting with large-format shutters is fairly easy. A leaf shutter will X-synch at all speeds. The flash exposure is determined by the length of the flash itself coupled with the distance from flash-to-subject, so you set your aperture for that. Then you simply meter the ambient light, figure out an exposure for it, and set your shutter speed to the appropriate setting for the aperture you have already chosen.
As Bob points out, strobe/flash lighting is "daylight" (~5500K) and hot lights are noticeably redder (3200-3400K). If you are shooting black and white, this isn't so much of a problem. With color, you might want to look into filtration for one or the other of the light sources.
As for exposure, if you don't have a flash meter, you can always figure things out the old-fashioned way with guide numbers. See here if you need to find out more:
https://en.wikipedia.org/wiki/Guide_number .
Best,
Doremus
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