"[RV 1.100.18] is the only one among these that contains a word meaning white or light. Given that the very next line begins with a reference to the sun, it is perfectly natural to assume that white or light here refers to the brightness of the sun or of a world that is illuminated by the sun, see Sayana's interpretation. Geldner's tentative equation of white/light with skin color is not required by the context."