. . "\\(L = \\frac{dI}{dA}\\frac{1}{cos\\alpha}\\), where \\(dI\\) is the radiant intensity emitted from an element of the surface area \\(dA\\), and angle \\(\\alpha\\) is the angle between the normal to the surface and the given direction."^^ . "L" . "\"Radiance\" is a radiometric measure that describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction." . . . "http://en.wikipedia.org/wiki/Radiance"^^ . "Radiance"@en . .