Richard Clark wrote:
Nearly every posting that Cecil pens with his rustic understanding of
Optics suffers from the obvious lack of experience.

Everything I write about light/optics comes straight from
_Optics_, by Hecht. I assume he is more of an expert than
you are and he uses the term "irradiance" for the power
contained in a light beam. Hecht's interference equations
involving irradiance are identical in concept to Dr. Best's
power equations in his QEX article.
--
73, Cecil http://www.qsl.net/w5dxp