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Imagine two boxes, one a "true"blackbody radiator (such as the box
with aluminum foil referred to by John D.) and the other a collection
of tunable lasers. These lasers are tuned and have intensities in
such a way that when someone plots the intensity verus wavelength of
the light coming out of the box the resulting curve matches that of a
blackbody.
Now if a thermometer is used to measure the temperature inside the
two boxes the temperature of the first box, the one with the "true"
blackbody in it, will correspond to the peak wavelength according to
Wien's law, whereas the second will not.
This is an apparent paradox to me. What is wrong?