LOL Dex!....and your still alive to tell about it, aren't you?
You guys have questions on basic electricity ask us before you do anything could get you into trouble ok? We'll try to keep you alive! Good idea about splitting off some of the load on that circuit and spreading it over two circuits....this will keep you safe and growing for years to come. Always look for the simplest way to solve a problem first, then go to the complex dangerous solutions only as a last resort! Here's a tip if you MUST use extension cords to do this....get the heaviest cord (thickest wire) you can afford if you are going to run it any distance at all....it's always better to have too big a wire, than too small! Much much safer too! If you think 12ga wire will handle it, buy 10ga, to be sure! Or in Dex's case if 2.5mm looks good, go for 3, or 4 even! Larger wire costs more, but it takes a lot more abuse than small wire, and 10ga will be near impossible to overload without tripping the breaker, (and that's what is supposed to happen on an overload situation) even at 100yds distance from the panel.