Two stars,Fred and Barney,are of the same size.Fred has spectral type F,while Barney has spectral type B.Which one is more luminous?

Name: Two stars,Fred and Barney,are of the same size.Fred has spectral type F,while Barney has spectral type B.Which one is more luminous?
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The Answer of Two stars,Fred and Barney,are of the same size.Fred has spectral type F,while Barney has spectral type B.Which one is more luminous?

Two Stars,Fred and Barney,are of the Same Size