Mike, by any chance to you have a temp gun and a ambient temp reader? If so when you have time go outside barefoot and measure the ground then measure the air temp. You will see that the ambient temp does not have to be high at all to give you a 100F surface temp. I personally have seen a difference with offering wide range of temps. Animals are more active and better feeding responce then that of what "breeders" recommend. What makes you think that a leo in the wild would seek out cool shelter if the surface temp is 100F? Clearly in the picture the leo is using 104F so whats gonna stop them from using it in the wild other then getting eaten?. I personally don't believe that captive care of reptiles has been mastered yet. So thats why I would "push it". I still get people asking for help on animals even though their care is spot on to what breeders recommend.