The formula describing the spectral radiant emittance of a perfect blackbody as a function of its temperature and the wavelength of the emitted radiation.
where Wλ equals radiation emitted into a hemisphere, C1
equals 3.7405 x 104
, λ is wavelength (µm), e equals 2.7183, C2
equals 1.4388 x 104
and T is temperature in kelvin.