Here is how God describes Himself in the Holy Quran:
Allah is the Light of the heavens and the earth.
His light is as if there were a lustrous niche, wherein is a lamp.
The lamp is inside a glass globe.
The globe is, as it were, a glittering star.
The lamp is lit from the oil of a blessed tree – an olive – neither of the East nor of the West, whose oil well-nigh would shine forth even though fire touched it not.
Light upon light!
Allah guides to His light whomsoever He pleases.
And Allah sets forth parables for men, and Allah knows all things full well. (24:36)