An undergraduate experiment using commercially available low power incandescent lamps was performed. The results
obtained, for higher temperature of the filament (say above 1000 K), were compared with those calculated using a
simple model, based on transfer of electric power predominantly into Planck’s radiation channel through Stefan-
Boltzmann law. The agreement between the results and the theory was quite satisfactory. Measurement of filament
temperature to confirm theoretical results, included in the present work, is expected to give a student more confidence
in the theory.