Baron fired this volley in news:mnrfje$jfn$2@dont-
email.me:

Actually that is a very good way to measure overall power. Radio hams
used to do just that to measure tramsmitter output.

Not only to "measure", but to figure peak 'final stage' tuning. I've tuned
into a "light bulb dummy load" many times.

Of course, the feedline and antenna always behave differently, but it's a
starting place. Did WAC on 40 watts, CW.

Lloyd