Welcome to Able2know and I hope you stick around.
Light is interesting as a metaphor for insight or an epiphany and is commonly used not just in religious inspiration but commonly in language.
Of course as Alan Watts points out the perception of light is actually composed of bands of light and dark, demonstrating the Buddhist saying that the difference is the identity.
We have to remember that the patriarchy conquered and overthrew all references to the goddess, the physicality or suchness of things and replaced it with thought. We live in a world now dominated by thinking and excluding the importance of the physical and feeling. Religion now, at least organized religion eschews the physicality of things or nature as such. So light refers to thinking about nature and not experience of nature.
As such, prose has replaced poetry.
And religious myths have been interpreted literally as prose instead of metaphorically as poetry.
Remember that the female creates physical beings and the male can only create by thinking, and I think of the daytime as being male and the nighttime as being female.
At one time I had a great phobia of the dark and the night, but I have resolved this and now love the night such as described in this poem Antoine de Saint-Exupery:
Night the Beloved
Night, when words fade and things come alive.
When the destructive analysis of the day is done, and all that is truly important becomes whole and sound again.
When man reassembles his fragmentary self and grows with the calm of a tree.