Second radiation constant in blackbody theory

secondRadiation is the second radiation constant used in Planck’s law for blackbody spectral radiance. It combines the Planck constant, speed of light, and Boltzmann constant.

Use

It appears in the exponential wavelength-temperature term of thermal-radiation formulas. See firstRadiation, boltzmann, and planckConstant.

Caveats

Keep wavelength and temperature units consistent. For peak-wavelength estimates, use wienDisplacement instead of manually optimizing Planck’s law.