From the website http://www.SubtleAnatomy.com
There exists 3 levels of Consciousness (Buddhic, Atmic, Monadic) that bridge the Individual with the Collective Whole.
A description of them is at the link below.
http://www.subtleanatomy.com/Buddhic%20body.htm ~ Divine Love/Unity (The Baptism Initiation is the first experience of the Buddhic Plane, see Gene Key 22.)
As One reaches the Buddhic plane of Consciousness, Oneness is Experienced
"As a being, standing in the sun, suffused with its light, and pouring it forth, would feel no difference between ray and ray, but would pour forth along one as readily and easily as along another, so does one on the buddhic plane feel brotherhood (or sisterhood) and pours themself into any one who needs their help. One sees all beings as themself, and feels that all one has is another's as much as one's: in many cases, more another's than one's, because their need is greater, their strength being less."
~ Arthur E. Powell
http://www.subtleanatomy.com/Atmic%20body.htm ~ Divine Wisdom/Mind/Christ Consciousness
http://www.subtleanatomy.com/Monadic%20body.htm ~ Divine Will/Oversoul
Also a description of Major Chakras and minor Chakras: http://www.subtleanatomy.com/Chakras.htm
These Chakra areas are where you might feel Light Activations...