The pure state of the mind, the base of Buddhahood, has a quality of clear light, which develops into the pure light of the natural state. This light is "rainbow light," not material light. It is the natural energy of the primordial state and the cause of samsara and nirvana. Through the movement of this pure light, which is the inner rigpa energy in the dimension of the primordial base, the five pure lights develop and begin to appear. This process is represented by the five-colored tigle that surrounds the white A and which symbolizes the primordial natural condition......The pure lights of the five colors constitute the second step in the production of existence; they are the source of the five elements that are the underlying structure of both the external existence of the world and the internal existence of the individual. In seeing these, we perceive the elements in their gross form, but in reality the source of the elements is the pure light of the natural state.
This clear light energy resides in the heart, rises through the channels, and is projected through the eyes. It is the basis of all vision and moves from the inner to the outer dimension.
http://balkhandshambhala.blogspot.com/2013/04/the-five-pure-lights.html
Now as for the stages of the main practice, at first you determine the ground by way of the Breakthrough, then the initial moment of impure consciousness emerges in the aspect of an object, a subsequent conceptualization fastens onto it, and delusion sets in. Now, in contrast, in the Leap-over, the initial moment of consciousness is transformed into an appearance of clear light, and by experiencing the very nature of consciousness, all impure appearances dissolve into the absolute nature and vanish. Knowing how that occurs is the indispensable, sublime point of the Leap-over, so recognize it!
http://www.theopendoorway.org/Dzogchen-Thodgal.htm
