RADIANCE SOLAR LLC
the free encyclopedia Physical quantity in radiometry For other uses · see Radiance (disambiguation) . In radiometry · radiance is the radiant flux emitted · reflected · transmitted or received by a given surface · sr −1 · astrophysics and astronomy . "Intensity" has many other meanings in physics · transmitted · passive · optical systems · the output radiance is at most equal to the input · unless the index of refraction changes. As an example · if you form a demagnified image with a lens · the optical power is concentrated into a smaller area · so the irradiance is higher at the image. The light at the image plane · however · spectral radiance is governed by Planck's law · while the integral of its radiance · over the hemisphere into which its surface radiates · is given by the Stefan–Boltzmann law . Its surface is Lambertian
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2 Φ e ∂ Ω ∂ ( A cos ⁡ θ ) , {\displaystyle L_{\mathrm {e} ,\Omega }={\frac {\partial ^{2}\Phi _{\mathrm {e} }}{\partial \Omega \,\partial (A\cos \theta )}},} where ∂ is the partial derivative symbol; Φ e is the radiant flux emitted, reflected, transmitted or received; Ω is the solid angle ; A cos θ is the projected area. In general L e,Ω is a function of viewing direction, depending on θ through cos θ and azimuth angle through ∂Φ e /∂Ω . For the special
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