Cecil Moore wrote:
Cecil Moore wrote:
To the best of my
knowledge, there is no such thing as instantaneous
irradiance.

The definition of irradiance is the "average energy
per unit area per unit time". Any deviation away
from "average energy per unit area per unit time"
when discussing what I have said is a straw man
diversion, not in the spirit of a good will
discussion.

The definition of irradiance, according to NIST, is power per unit area.
The standard units are W/m2 or lumen/m2.

You can add average, peak, instantaneous, or whatever you like to
further define your quantity of interest. Such additions, however, are
not part of the standard definition of irradiance.

73,
Gene
W4SZ