Dave Shrader wrote:
"I believe Efficiency is the ratio of power radiated to power input."

Dave has a point. Basic efficiency is output divided by input.

Power, work, or energies can be used for the ratio. An example of energy
efficiency is in the "all day efficiency" of an electric distribution
transformer. The transformer may be energized but supplying little or no
energy during many of the 24 hours. While idle, the transformer draws
excitation current just as it does when fully loaded. So, the
transformer`s 24-hour average efficiency is lower than its efficiency
while nearly fully loaded.

Best regards, Richard Harrison, KB5WZI