The Muhammadan light is the teaching that the first thing God created was the light of the Prophet, from which all else was made, and that this light passed through the prophets before appearing in Muhammad. Sufis and Shīʿī thinkers developed it; it underlies the idea of the perfect human.
Nūr Muḥammadī
The light of Muhammad: the primordial light created before all things, from which creation proceeds.
Also: Muhammadan light