Great advances have been made in our knowledge and understanding of the importance of correct heating and lighting (that best replicates the sun) for our pet reptiles. For some reason, perhaps due to folklore husbandry amongst other things, the general information given out in the green tree python community seems to be far behind what the current scientific literature tells us. Very often I see new keepers being told to use radiant heat panels, heat mats, ceramic bulbs which are all poor choices for a standalone heat source. For this reason, I have attached a link to an article that is a great introduction to modern heating/lighting practices for those long time keepers that may be interested and any new keepers looking for science backed advice. 
https://www.reptifiles.com/wp-content/uploads/2020/01/Why-Infrared-Matters-by-Roman-Muryn.pdf

Often people say that halogen/basking bulbs are dangerous to gtp for a variety of reasons that are not backed up by evidence, one being that these species do not bask in the wild and so they do not need it. In fact, whilst it may not be obvious to the observer, they utilise all wavelengths of the sun by performing ‘cryptic’ basking. Here are some photos of my Manokwari gtp doing exactly that under his halogen basking bulb, T5 UVB bulb with a measured UV index of 1.5 and 6500k LED light to provide bright ‘visible light’.

Choosing appropriate infrared sources for gtp