Don't get too concerned about the conflicting advice. The reason is that there's more than one way of setting things up. These are the important requirements:
1 dragon per viv
Floor area at least 4 x 2 ft
Basking temperature around 40C (maybe even a bit more)
Warm end approx 35C
Cool end approx 28C (don't get too uptight about temps - they vary quite a lot in the wild!)
Use an appropriate thermostat for the heat source
Measure the temperatures using a calibrated thermometer (don't rely on the setting on the thermostat - they're rubbish)
Strongest UV you can get 12% arcadia is good - and use a reflector
Night time temp drop can go down to 15C or so, but don't let it drop too low.
You can use a ceramic as the only heat source if you want. Beardies have a parietal eye in the top of their head and are able to locate an IR heat source. The advantage of a ceramic is that you can also use it to maintain a minimum night time temp, but you will need a day/night thermostat for this.
Draco dormiens nunquam titillandus
“... there is no shame in not knowing. The problem arises when irrational thought and attendant behavior fill the vacuum left by ignorance.”