As used at astrophysics, Stefan's law is expressed as:

L = 4 π R^{2} σ Τ ^{4}

^{L: Luminosity (in Watts)}

^{R: Star radius}

^{T: Star's surface temperature.}

^{It's derived from the Stefan's formula, used priorly to calculate the star temperature:}

*j** = **𝜎**T*^{4}

where j is the Iradiance or Flux Density (Watt/m^2), which is estimated by comparisons with

references (like our Sun's Irradiance).

What do you think about the use of this formulae?

Here is a link about part of the topic.

https://www.teachast...-Boltzmann-Law/