Intensity
/ɪnˈtɛnsɪti/
noun
The quality of being intense.
The degree of strength.
Time-averaged energy flux (the ratio of average power to the area through which the power "flows"); irradiance.
noun
The quality of being radiant, shining, bright or splendid.
The flux of radiation emitted per unit solid angle in a given direction by a unit area of a source.