Which is why I didn't designate them as 600W, but just '600'. It's a standard which means your food will get hit with the equivalent of half the energy of your 1200W microwave. (Which, in most cases, is 50% on + 50% off. Which my current microwave calls "Medium" maybe?)

Not the point, is it? 50 percent of a 1000W oven is basically 500W. W is energy / time, which is compatible with time division.