We therefore need a metaphysics of Light whose paths will be mapped by the mystic’s spiritual experience of colors, especially, in the present case, the experience of the Iranian Sufis.
Corbin argues that a full metaphysics of light must be grounded in the visionary chromatic experience of the Iranian Sufi masters, distinguishing between divine ‘black light’ and the darkness of matter.
, The Man of Light in Iranian Sufism, 1971thesis