In everyday life we know that something described as 'white hot' is hotter than something described as 'red hot'. What is the physics behind these everyday sayings? The BB spectrum: Peak emission wavelength gets shorter as object gets hotter: Wavelength of white photons is shorter than red photons. The BB spectrum: Peak emission wavelength gets longer as object gets hotter: Wavelength of white photons is longer than red photons. The BB spectrum: Peak emission wavelength gets shorter as object gets hotter: White hot object is emitting all visible photons with roughly equal intensity. Red hot object is just emitting the long wavelength red photons. The BB spectrum: Peak emission wavelength gets longer as object gets hotter: White hot object is emitting all visible photons with roughly equal intensity. Red hot object is just emitting the long wavelength red photons. There is no physics behind these sayings.