Eddington luminosity
= Eddington luminosity
{c}
{title2=$L_{\rm Edd}$}
{wiki}
Balancing outward radiative acceleration against gravity gives
$$
L_{\rm Edd}=\frac{4\pi cGM}{\kappa}.
$$
It is an approximate upper luminosity for a hydrostatic star of opacity $\kappa$.