I thought that I would bring this to the attention of those who may be interested in control of lighting as relates to tonal representation in photography.
I first encountered Dean Collins about thirty years ago through an educational series that he produced called "Fine Light". Unfortunately he died at a young age due to cancer. Recently I re-encountered the video of his presentation at Brooks Institute in 1991.
You may find the link to a preview of his methods and a source for the video at the site below: