It's a well written book, but so it should be, based on all the information that is taken from Dinshahs'initial work on light therapy over 50 years ago. You can get copies of Dinshahs' material "cheap" from their website... Dinshahs' work was well ahead of its time. It's too bad certain organizations are"still" threatened by his work even though it was an array of doctors who had written most of the original testimonials backing up his work. "Color Medicine" is mostly Dinshahs' work with some good added info. on the healing powers of sound. It's nice to know a modern book acknowledges Dinshahs' work as opposed to many other "Color" books that don't.