noun Physics.
incident flux of radiant energy per unit area.

1660–70; ir-1 + radiance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irradiance (ɪˈreɪdɪəns)
Compare illuminance Ee, Also called: irradiation the radiant flux incident on unit area of a surface. It is measured in watts per square metre

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The amount of solar irradiance has not changed at the bottom of the atmosphere.
It is called the total solar irradiance and it has not moved upwards in decades
  and has in fact declined slightly.
The power of heat input during the day depends on local albedo and the sine of
  the angle of the incident solar irradiance.
Beam irradiance, and not merely total power, is everything.
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