The problem right here is that most people asking for help are obviously experiencing issues and recommending optimum ranges is what will help them solve those issues as fast as possible.I do not recommend going this cold for those that are new to ball pythons. However I am tired of hearing new people in the hobby saying the ambient has to be 80 and you must have light for them because both statements are false. Vent over LOL
It does not mean that they should not experienced around when they are knowledgeable enough and it does not mean the person making those recommendations keep theirs that way, their are many way to keep Ball Pythons the important is to find the one that works for your animals and yourself.
I NEVER recommend what I do, reason being it would not be optimal for a new owner and would not help troubleshooting their issues.