These are colors that are related to the different Sephirah and paths in the Sephiroth, or the Kabbalah Tree of Life. Similar color schemes were use in the Golden Dawn and by Aleister Crowley in his religion of Thelema. The Ogdoadic tradition of the Aurum Solis has a somewhat different set of color scales. A.G.H.
Greer, John Michael. The New Encyclopedia of the Occult. St. Paul, MN, Llewellyn Publications. 2003. p. 110