Mass to light ?? Some mass is lost in a star when it burns hydrogen to form helium ( 4H = 1He at more than 7000 C is'nt) ? .. Any calculation how much is lost ?? Even when u burn something which forms flame with are turning some mass into light right or wherelse is the light comming from (We all know flame emits light) ? by the way is'nt is breaking the law mass can neither be destroyed nor be created ?