So I am getting ready to setup the T8 from APC for my ball python. I was going to buy a Vivarium Electronics Radiant Heat Panel 80 watt. From what I have read a 80watt should been good for a 4x2, but the dang things have been out of stock for months now. Does anyone know if a 40 watt will work because those are never out of stock on reptile basics or reptile wholesale or buy two 40 watts and put on on each side and just keep one a little be colder on the cool side....I don't know...