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Radiosity is the total of emitted and reflected radiation leaving a surface, in the fields of optics and heat transfer. Hemispherical radiosity Jλ(λ) is the integral of the spectral intensity of reflected plus emitted radiation over the hemispherical solid angle[1]. The total hemispherical radiosity J is the integral of the hemispherical radiosity over all wavelengths:

$J = \int_{0}^{\infty}J_{\lambda}(\lambda)d\lambda = \pi I_{e+r}$

The radiosity method is used to solve for the radiative heat transfer between a number of surfaces. Because the radiation hitting each surface is determined by the temperatures of of all the other surfaces, this method requires the solution of a system of simultaneous equations using matrix methods. For more information see Radiosity (computer graphics).