The plasma inside arc lamps (e.g. xenon headlights) are somewhere around 6,000-10,000 K.
Then there are things like fusion reactors where the temperature is in the millions of degrees and the whole point of the design is to keep the heat in.
Edit: although interestingly in an electric arc, often the electrons have a higher kinetic energy (temperature) than the heavier ions and atoms in the plasma. It's a highly non-equilibrium situation. That plays into your "high temperature, slow transfer" thing quite nicely: even the atoms within the plasma don't reach the full temperature of the electrons.
kurthr
Came to say this about fluorescents, but even the tungsten filament in an old style bulb could easily be 5000K which is ~8500F.
Then there are things like fusion reactors where the temperature is in the millions of degrees and the whole point of the design is to keep the heat in.
Edit: although interestingly in an electric arc, often the electrons have a higher kinetic energy (temperature) than the heavier ions and atoms in the plasma. It's a highly non-equilibrium situation. That plays into your "high temperature, slow transfer" thing quite nicely: even the atoms within the plasma don't reach the full temperature of the electrons.