Faraday, Michael - Defining the nature of electromagnetic forces while in a state of intuitive vision
Type of spiritual experience
I could find no direct accounts of Faraday having had visions or hallucinations, but this quote implies that he received simular insights to, for example, Einstein
A description of the experience
Manic Depression and Creativity – D Jablow Hershman and Dr Julian Lieb
Michael Faraday, who suffered from recurrent depression, defined the nature of light and electromagnetic forces while in a state of intuitive vision and thereby developed one of the foundations of physics although lacking any formal training in mathematics.
there is also the following
Sir James Jeans – The Mysterious Universe
The properties it needed to fulfil this function had been defined with ever increasing precision by Huygens, Thomas Young, Faraday and Maxwell. It was thought of as a jelly like sea through which waves could travel, just as vibrations or undulations travel through a jelly.