Model-independent energy budget for LISA

We provide an easy method to obtain the kinetic energy fraction in gravitational waves, generated during a cosmological first-order phase transition, as function of only wall velocity and quantities that can be determined from particle physics model at nucleation temperature. This generalizes recent work achieved this goal for detonations. Here we present corresponding results deflagrations hybrids. Unlike detonations, sound speed symmetric also enters analysis. perform detailed comparison between our model-independent approach other approaches literature. Python code snippet determine $K$ velocity, two speeds strength parameter transition. assess how realistic sizable deviations are close transition temperature specific model.