Yes I do mean 140f.
Although I should say up to, which means 120 to 140 f.
But then I dont have one or two Beardies and havnt had them for a year or two.....
Ideal set up is a min 6 by 2 foot with an un stated heat source regulated according to environmental factors by the wattage. The size viv allows for heat dissipation and gradient.
Just check the ave temp of their natural enviroment and tell me that only gets to 86f !
Oh, and unless your in a very cold environment, it wont be often your home gets to less than the aussie desert at night time, so no need to wast funds on heat mats for the night !.