kinda of a set of newbie questions... what is the difference between the Habistat Heat Mat High Power and their standard mats is it literally their hotter, or is it theres more to them then that? how much hotter does the 6x11 high power mat at 15w get compard to the same size mat at 7w? is the heat delivered in a differnt way for example? some general info about them would be greatfull