|radiance or radiancy (ˈreɪdɪəns)|
|—n , pl -ances, -ancies|
|1.||the quality or state of being radiant|
|2.||Le a measure of the amount of electromagnetic radiation leaving or arriving at a point on a surface. It is the radiant intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction|
|radiancy or radiancy|
radiance ra·di·ance (rā'dē-əns) or ra·di·an·cy (-ən-sē)
The quality or state of being radiant.
The radiant energy emitted per unit time in a specified direction by a unit area of an emitting surface.