This is one of the major problems with the advice given by the pet industry. There is a misconception that all lizards can be kept in the same manner, at the same heats.
There is a guy on these boards named Dave/Crocdoc, who lives in Australia. He has commented on the forums that when he goes out in the bush to observe monitors, he notices that during the absolute hottest part of the day, monitors are active when not many other reptiles are. Bearded dragons are generally under cover.
So the idea that a bearded dragon, which will make use of a lower temp basking area and will even mouth gape at higher temps, is at all indicative of the temps a monitor needs to be kept at, is simply misinformation fed by the companies who want to sell 100W Zoo Med basking bulbs.