Suhrewardi's Metaphysics of Lights was an important stride in development of Islamic philosophical legacy. His both ontological and epistemological innovations -- accordingly explanation of existence by a substantial analogy with workings and characteristics of light, and the idea of superiority of intuitive knowledge over reason -- were later adopted by Mulla Sadra who in turn made a greater stride by reconciling Suhrewardian Illuminationism with Peripatetism to form his synthetic school of Transcendent Philosophy. Mulla Sadra paid equal regard to reason and intuition and considered them two irreplaceable and inseparable means of obtaining knowledge.

But as for your question, drawing analogy between existence/knowledge and *light* does find a lot of references in the Quran and Hadith; most notable and impressive is the verse 35 of Surat un-Nur (a Sura which actually *means* Light) that exhibits an expressive Illuminationist theme:

> God is the Light of the heavens and the earth. The allegory of His
> light is that of a pillar on which is a lamp. The lamp is within a
> glass. The glass is like a brilliant planet, fueled by a blessed tree,
> an olive tree, neither eastern nor western. Its oil would almost
> illuminate, even if no fire has touched it. Light upon Light. God
> guides to His light whomever He wills. God thus cites the parables for
> the people. God is cognizant of everything. ([24:35](http://tanzil.net/#trans/en.itani/24:35))

Another example is found in Surat ul-An'am:

> Is he who was dead, then We gave him life, and made for him a light by
> which he walks among the people, like he who is in total darkness, and
> cannot get out of it? Thus the doings of disbelievers are made to
> appear good to them. ([6:122](http://tanzil.net/#trans/en.itani/6:122))

Another interesting example can be seen in Surat ul-Baqara

> God is the Lord of those who believe; He brings them out of darkness
> and into light. As for those who disbelieve, their lords are the evil
> ones; they bring them out of light and into darkness; these are the
> inmates of the Fire, in which they will abide forever. ([2:257](http://tanzil.net/#trans/en.itani/2:257))


Among the hadiths, I can now only think of a famous one by the Holy Prophet which I think appears only in Shiite sources but I'm not sure. It reads:

> Knowledge is a light that is granted by Allah to whoever He desires.

To summarize, the concept of *light* in Islamic sources similar to Suhrawardi's application is associated with concepts of perfection such as Allah, faith, guidance and goodness; while darkness is associated with their opposites such as Satan, disbelief, mislead and evil.