Radiance
L = c₁ν³ / {exp(c₂ ν / T) -1 }

first radiation constant
c₁ = 1.191 042 869 x 10^-16 W m² sr^-1

second radiation constant
c₂ = 1.438 7770 x 10^-2 m K

T = temperature [K]
ν = wavenumber [cm^-1]

Radiance calculation

T: K
ν: cm^-1    

L: mW / ( m² cm^-1 sr )

Temperature calculation

L: mW / ( m² cm^-1 sr )
ν: cm^-1     

T: K