The blue will fade faster than red. Thus when the bulb is hotter, the more blue is seen in the spectrum. When the bulb is cooler, the more red is seen. It can be said that cooler objects radiate most of their light in the red end of the spcetrum. Thus when the temperature is raised, more blue is shown.
Students have to compare what they learned about the spctrum to the stars.
Hotter stars will show more blue in their spectrum and cooler stars will show more red in their spectrum.