I'm sorry but if you're really trying to argue that electromagnetism (the scientific name for "light") was not the main transmission method of Rife's frequencies, then you've got a lot of work ahead of you because you are contradicted by decades of documents, interviews, and lab notes. Rife used light. Period. I don't know where you're getting the idea that he didn't.
For the record, light = electromagnetism. It's just another fancy name for it.