This works depending on the intensity of the ambient light -vs- power of the flash bulb. If one were to use one of those "nuke" Edison base flash bulbs at short distance (10 ft_ish), ambient light intensity is not likely going to be a problem .... Ever. Do this same measurement with a Kodak Flash cube, ambient light -vs- shutter time and built light intensity will be a problem at ... 10ft.
Really a question of bulb burn up time -vs- film speed -vs- shutter open time. Possible to make an ambient light measurement for a given film speed and shutter speed, then figure in this exposure to the amount of light that would be added by the flash bulb.
Bernice
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