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Radiant Flux Density
Irradiance
Radiant exitance

Radiosity is an old term for radiant exitance.
Radiant emittance is an old term for radiant exitance.

(Terms of radiometry)

The radiant flux per unit area at a point on a surface, where the surface can be real or imaginary (a mathematical plane). An imaginary surface can for example be used to calculate or measure radiant flux density anywhere in space.

There are two cases:

Standard unit of all forms of radiant flux density is watts per square meter (W/m2).

 

References:
   luminous flux density
illuminance
luminous exitance
radiant flux
radiometry
 
 
English    German
radiant flux density    Die Strahlungsflussdichte
irradiance    Die Bestrahlungsstärke
radiant exitance    Die spezifische Ausstrahlung
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