  The evolution of stellar collision products in cluster simulations has
usually been modelled using simplified prescriptions. Such prescriptions either
replace the collision product with an (evolved) main sequence star, or assume
that the collision product was completely mixed during the collision.
  It is known from hydrodynamical simulations of stellar collisions that
collision products are not completely mixed, however. We have calculated the
evolution of stellar collision products and find that they are brighter than
normal main sequence stars of the same mass, but not as blue as models that
assume that the collision product was fully mixed during the collision.
