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In the fields of optics and heat transfer, radiosity is the total emitted and reflected radiation leaving a surface.

The diffuse radiosity (J) is the integral of the hemispherical spectral radiosity ($J_\left\{lambda\right\}$) over the spectrum:

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

where $J_\left\{lambda\right\}$ is equal to integral over the hemispherical solid angle of the sum of emitted and reflected radiant intensities.

The radiosity method is used to solve for the radiative heat transfer between a number of surfaces. This method requires the solution of a system of simultaneous equations using matrix methods because the radiation hitting each surface is determined by the temperatures of all the other surfaces.