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Radiant Intensity

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radiant intensity [′rād·ē·ənt in′ten·səd·ē]
(electromagnetism)
The energy emitted per unit time per unit solid angle about the direction considered; usually expressed in watts per steradian.
Radiant Intensity 

a radiometric unit that characterizes the radiation from a source in a certain direction. Radiant intensity is equal to the ratio of the radiant flux emitted by the source in an infinitesimal solid angle containing the direction considered to the solid angle. The concept of radiant intensity is applicable at distances from the source that greatly exceed the source’s dimensions. The unit of radiant intensity is watts per steradian.
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The dry-bulb temperature is easily measured, while the mean radiant temperature can be calculated either by the classic method using surface temperatures and view factors as described in the ASHRAE Handbook--Fundamentals (2001) or by the radiant intensity method presented by Chapman and DeGreef (1997).
Fenestration performance maps by Sengupta, Jeet; Chapman, Kirby S.; Keshavarz, Ali; Watson, Richard D. / ASHRAE Transactions
blackbody, [epsilon) = 1) with the same radiant intensity as the test surface at a specified wavelength.
Extended temperature range for calibration of two-color pyrometers. ... by Journal of Research of the National Institute of Standards and Technology
While reaction time is dependent on radiant intensity levels of the energy source, these two components are capable of reacting at extremely high rates.
Shedding some light on UV curable coatings by Susnis, Chuck / Wood & Wood Products
 
 
 
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