“Light” by itself does not exist. A certain phenomenon occurs within the creature, and the creature calls it “the Light.”
As the creature awakens to sense this phenomenon, it means that the Light spreads within it. However, in reality nothing spreads, nor does it come from anywhere! A desire simply awakens within me and I call its character, form, shape, and color “the Light” which spreads within, enters, and exits me. It exists in a process.
Yet, other than my inner desire there are no other processes that are occurring. I call part of these processes “the desire” and part “the Light.” In other words, my desire changes, and as a result, I call the phenomena that occur within it “the Light.”
From the Daily Kabbalah Lesson 12/31/2010, Talmud Eser Sefirot