The mass-luminosity relation during the formation phase for the cold-classical (low core mass) population, analogous to Fig. 2. The gray and black lines in all four panels are identical as in Fig. 2. Note the giant planets with very low post-formation luminosities, even lower than in the classical cold start simulations of Marley et al. (2007) which are shown with the dotted black lines at 5 and 10 Myr.