This very interesting form of imaging has been, for the most part, cast aside by mainstream medicine.
Experimentation shows that varied exposure time had a negligible impact on imaging.
After taking hundreds of Kirlian pictures and comparing them to Peter Mandel's research, I know that I know that I know that Kirlian photography is a valid and useful tool in gauging a person's health, both energetic and physical. Currently, in my mobile California practice, I only take Kirlian photos when specifically requested. I do not charge extra for the service, but of course it adds to the time of the visit, and I charge an hourly rate. I use Polaroid ProVivid 689 film with the portable unit.