Light seen in this fashion is simply the light of manifestation which is born of the dark depths of the unmanifest.
It is important to not read these as belief systems, but as messages regarding one's goal in meditation. As Lao Tzu states in the Tao Te Ching, "be newborn, be free of yourself." It is this place of nothingness that one who meditates often aspires to reach. It is this place that exists as pure Creativity. As the Hindu Ramakrishna states,
"The Unmanifest is like an infinite serpent and Shakti (Energy) is simply the movement of the great serpent. The Unmanifest shines forth as Shakti and Shakti is simply the luminous darkness of the Unmanifest. Mother Essence (Nature) and Mother Energy are not two." (Transcribed in Hixon's The Great Swan: Meetings With Ramakrishna, Quest Books, p. 174).
The Unmanifest is simply the place of infinite potential. It is the place of change. It is the place we must go to bring forth real change. As Ramakrishna describes Mother as pure Creativity, it is there, in the Unmanifest, that all things exist in potential.
To get there, our meditations must take us to a place where we "exist not," according to the words of the Christian Meister Eckhart. It is this same place that the Kundalini Yoga practice of Yoga Nidra takes you. Nidra simply means deep sleep, thus the meditation is into the state of deep sleep, where you are and are not, while fully awake.
It is there that you reach the place where Lao Tzu, the author of the Tao Te Ching, wants you to go when he says, "be newborn; be free of yourself." It is this place that lies beyond the stars yet is closer to you than your nose is to your face. The following short film may be able to give you some conceptualization of this incomprehensible place. Why is it ultimately incomprehensible? It is because like the pupil of the eye, it cannot see itself without a mirror.
You are the mirror and that which gazes into the mirror. This is beautifully reflected in the following movie:
Poem of Aluna taken from: http://www.theosophy-nw.org/theosnw/world/america/my-rayr.htm
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