Of the most important names God uses to describe Himself in the Qur’an is that of light (nur). God Himself is the supreme Light and all that He created are also lights. Using the Qur’an and Islamic traditions, this article addresses some of the major aspects of the concept of light. Light is one of God’s qualities, and every being in the universe is endowed with it. Moreover, the amount of light all creatures hold depends on the capacity of their existence; some beings have a fixed amount of light, while rational beings with free will, that is, human beings and jinn, can increase their light with faith and good deeds, or decrease it with disbelief and transgression.