I’m looking to purchase a toroidal AUSTRALIA-to-US stepdown voltage transformer, and have narrowed my choice down to two models, one permitting a maximum rate of energy consumption of 100 Watts, and the other permitting a maximum rate of energy consumption of 250 Watts. Both of these maximum wattages (100 W and 250 W) are easily in excess of the wattages of the appliances that would be used with the stepdown transformer. My main purchasing criterion is the minimization of magnetic field leakage (i.e. stray magnetic fields), and this is what led me to decide on a toroidal design stepdown transformer. I know that I can use magnetic shielding, Mu metal, etc., to address concerns in relation to magnetic field leakage, but if the choice between using a smaller rated stepdown transformer (100 Watts, say) versus a larger rated stepdown transformer (250 Watts, say) could ALSO influence/affect the strength of the resultant magnetic field leakage, I’d like to go with (choose to purchase) the stepdown transformer that would give rise to a smaller magnetic field leakage for an appliance of a given wattage. For example, let’s say that the most energy-hungry appliance that would be used with the stepdown transformer, consumes energy at a rate of 50 Watts. If we let ‘MFL_100(50)’ denote the resultant magnetic field leakage when operating the 50 Watt appliance from the 100 Watt toroidal stepdown transformer, and ‘MFL_250(50)’ denote the resultant magnetic field leakage when operating the 50 Watt appliance from the 250 Watt toroidal stepdown transformer, then which of the following would most likely be true?: (a) MFL_100(50) < MFL_250(50) (b) MFL_100(50) = MFL_250(50) (c) MFL_100(50) > MFL_250(50) If anyone could answer this question for me, it would be greatly appreciated.