I am planning some studio work with my Cambo Legend with 150mm, n0.0 and 210mm n1 copal shutters. I have modern Profoto 600 watt sec. monolights.

I've read that the light is reduced by about half between 1/100th sec and 1/500th sec with a the max. shutter speed that can be used without cutting off any light please?
Is there a recommended shutter speed with electronic flash?