Gen your hot spot should be just that, a general location your new buddy can crawl to for some xtra warmth( typicaly 88-92 degrees) and wich will naturaly produce a heat gradient (closer he gets the warmer, the farther away the cooler) so long as the coolest part of the enclosure is above 75-76 he'll have lots of sots to choose for that "aahh thats just the right temp" feeling.