The Monte Carlo method and Large Eddy Simulation model were used to study the spectral dependence of the horizontal radiative transport in three-dimensional broken stratocumulus clouds. It is shown that the horizontal transport strongly depends on wavelength, while variations of its spectral features are mostly determined by absorption of light in water droplets and by water vapor. The neglect of this spectral dependence can be a cause of large errors in retrieval of spectral absorption of inhomogeneous clouds.