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On a related issue: do your students use an optical pyrometer to
measure the filament temperature? I think this instrument (which may
be a tad expensive) is a marvelous one to introduce students to, and
it fits well into the course when one is studying Stefan's law as
your students are doing. 42 years ago, while I was working at General
Atomic in La Jolla, a colleague devised a method by which the optical
pyrometer temperature range could be extended downward. He used a
chopper wheel running at about 10 Hz to make the dimly glowing
filaments visible. I think it got written up in RSI or somewhere like
that.