Answer:
As nouns the difference between light and lightning is that light is (uncountable) the natural medium emanating from the sun and other very hot sources (now recognised as electromagnetic radiation with a wavelength of 400-750 nm), within which vision is possible or light can be (curling) a stone that is not thrown hard enough while lightning is a flash of light produced by short-duration, high-voltage discharge of electricity within a cloud, between clouds, or between a cloud and the earth.