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MJC

In article , says...
2. Even low rated power resistors can be used for the load provided
their
case temperatures are kept low by some effective means of external
cooling (something more than mere heat sinks and fans, IOW).

To an extent. Seems to me that the winding temperature will rise because
the insulation between case and wire will not have infinite heat
conduction. At some power level the lifetime must start to shorten...

Mike.