Radiant power in astrophysics is traditionally called “luminosity.” At the Eddington luminosity, LEdd ≡ 1.2× 1038M ∕M⊙ [erg∕s], radiation force balances the gravity of the central object (with mass M). In the case of stars, “super-Eddington” luminosities, L > LEdd, are not possible, as this would mean radiation pressure would blow the star apart.