How does the energy output from hydrogen shell burning compare to the star's previous core fusion rate?

Answer

The energy output from shell fusion is higher

The energy generated by the ignition of hydrogen fusion in the shell surrounding the core is actually higher than the energy the star produced while fusing hydrogen throughout its core during the main sequence phase.

How does the energy output from hydrogen shell burning compare to the star's previous core fusion rate?
astronomystarstellar evolutionmain-sequencered giant