Hello, we have some source four lekos fitted with 20 amp twistlock connectors... However we want to use them in a location with 20 Amp Edison outlets. I've always been told "if the circuit is capable of 20A, everything in the circuit need to be rated 20A or higher" but the way I'm thinking right now is that a 575w lamp in our lekos doesn't draw 20A through it's plug... So why can't I use a 15A plug, most 20A Edison plugs I've seen are $10 or more. For 16 fixtures this can be a lot. Is there a good reason for this rule I was told or is that only for the parts of the circuit which will receive 20A?