Background (see https://greenlantern.fandom.com/wiki/Emotional_Spectrum#White.2FLife):

The White Light of Life is where the Emotional Spectrum originated. According to Indigo-1 and the Guardians of the Universe, in the beginning the universe was absolute darkness. At an unspecified point in history, the white light was introduced by an entity or entities unknown, and for 700 years the universe was nothing but a blinding white light. The darkness however, fought back against the light, eventually dividing it into the 7 Colors of the spectrum that exists today. Those who wield the white light have the capability to resurrect the dead, teleport, and can create constructs that can potentially last longer than those cast by other lights. The white energy comes from all living things, and all living things from it. So far, ring wielders seem to have no control over the ring itself, the rings doing the bidding of the Life Entity. Unlike other rings, which must be charged from a battery (with the exception of black), white rings are automatically charged whenever the wielder performs actions that constitute "living".