The answer to this is more of a general nature, because there are different technical types of controlling and regulating. In principle, when talking about studio flash, the lowest output does not guarantee the lowest flash duration time. Normally, this only applies to shoe mount flashes.

Example: the new Expert D or also the Porty L units by Hensel. Both series offer the lowest flash duration times even at a medium output level.

The Expert D units, for example, have a flash duration time of ca. 1/5.600 s (t 0.5) at an output setting of 8.4. In practice, this can often be the deciding factor for achieving a well-done exposure. Units which only have low flash duration times when set to a low output setting are usually insufficient for many applications! However, this information is seldom listed in catalogues and can usually only be found in user manuals or on data sheets. Generally, this also applies to generators, but here other factors play an important role, especially the number and type of flash units attached.

Here’s a list showing the flash durations of all current Hensel monolights.