Du’aa of the Prophet [Sallallahu 'Alaihi Wasallam]:

O Allah, create light in my heart, and light in my eyes, and light in my hearing, and light on my right, and light, on my left, and light above me, and light beneath me, and light in front of me, and light behind me, and appoint light for me, and magnify light for me. O Allah, bestow light upon me.

[Excerpted from Radiant Prayers by Mufti Taqi Usmani]