Remember that T6/ITT/whatever you call it on your airplane is a compromise between accuracy at the temperature in the hot section, and sensor survivability - and these temperatures will vary between individual engines of the same design (CLUNK, "Ignition light out," "Uh...four hundred and fifty eight?") and between different designs.
We have 800/816 continuous/5 minutes, then for start 816-850 for 20 seconds and 850-950 for 5 seconds (all degrees C) on start. The actual temperatures where the actual burning is going on is higher, but they can't be accurately measured since the sensors themselves would quickly be destroyed. And would probably be super scurrry.