The Simpson-Nakajima limit is lower than the Komabayashi-Ingersoll limit, and is thus typically more realistic for the value at which a planet enters a runaway greenhouse state. For example, given the parameters used to determine a Komabayashi-Ingersoll limit of 385 W/m2, the corresponding Simpson-Nakajima limit is only about 293 W/m2. The Simpson-Nakajima limit builds off of the derivation of the Komabayashi-Ingersoll limit by assuming a convective troposphere with a surface temperature and surface pressure that determines the optical depth and outgoing longwave radiation at the tropopause.