Energy can be converted to mass, and interacts with gravity (such spawned the idea of a Kugelblitz Blackhole). Therefore energy "Technically" has weight in that you ""could"" put in on a scale and gravity would pull on it some amount.
It's just that SO MUCH ENERGY is SO LITTLE MASS that you would need an instrument more precise than any one we've every made to detect the "weight" if a candle flame.
It's just that SO MUCH ENERGY is SO LITTLE MASS that you would need an instrument more precise than any one we've every made to detect the "weight" if a candle flame.