I’m not sure if you’re referring to an infrared heating panel or a ceramic heating element (such as those made by Pearlco, ZooMed, etc.).
If it’s a heating panel, there’s a chart on the bottom third of this site that may help you:
Infrared Heating Panels for Animal Cages
If you are talking about a ceramic heating element, I’ve never seen a chart with the information you seek. There would be big differences between one kept in a simple wire enclosed socket and one with a reflective metal cover around it. They do sell inexpensive thermostats for these heaters, though you need to come up with a way for a parrot to not destroy the sensor.
Good luck in finding the information you seek.
