Noor-e-Khuda is made up of words Noor and Khuda. Khuda, as you must be knowing, is God, while Noor is Urdu for Light. Hence, Noor-e-Khuda is 'Light of God', or a Divine Light.
Noor-e-Khuda is a popular song from the movie My Name is Khan, sung by Shankar Mahadevan, Adnan Sami and Shreya Ghoshal.