law giving the spectral distribution of radiance of a Planckian radiator as a function of wavelength and temperature
Note 1 to entry: The formula is sometimes written with instead of , where
Note 5 to entry: For the up-to-date values of the Planck constant,
Note 6 to entry: This entry was numbered 845-04-05 in IEC 60050-845:1987.
Note 7 to entry: This entry was numbered 17-958 in CIE S 017:2011.