µW/cm^2 Is An Irrelevant Measure

Powerwatch.org.uk:

[Power density] is ONLY relevant to heating and it averages the power over time (6 minutes for official RF PFD measurements). Powerwatch believes that the best unit of measurement for varying microwave signals at the non-thermal levels we are concerned with is volts per metre. Most instruments that display PFD units have actually measured the signal in terms of V/m and then internally calculated the equivalent (usually average) PFD value in W/m2 or similar.

Units of Safety - April 2011

Units of Safety 2 - May 2011

Units of Safety 3 - June 2011