  In nematic liquid crystals light is strongly scattered from director
fluctuations. We are interested in the limit where the incoming light wave is
scattered many times. Then, the light transport can be described by a diffusion
equation for the energy density of light with diffusion constants $D_{\|}$ and
$D_{\perp}$, respectively, parallel and perpendicular to the director. We start
from a radiative transfer theory, connect the diffusion constants to the
dynamic structure factor of director fluctuations, and shortly discuss our
results. Temporal correlations of the diffusing light probe the dynamics of
director modes on much shorter time scales than single light scattering
experiments. To account for the decaying temporal correlations, one has to add
an absorption term to the diffusion equation, which we also link to the dynamic
structure factor.
