Quote Originally Posted by Darkbluesky View Post
As said, now I don't know if I should believe, for example, the types of light/power used described in the book or if they are also completely wrong... this is just an example.

Right or wrong it's irrelevant past generalities, IMO.

It's has a real scientific basis and studio sets are very good at repeating effects, but each and every subject that may sit for you will differ in both shape and reflectivity. Adjustments here and there to suit a subject would probably have been the norm not the exception for Hurrell, similarly they will be for you.