  Large-scale peculiar motion modulates the observed luminosity distribution of
galaxies. Using about half a million SDSS galaxies, this can be harnessed to
obtain bounds on peculiar velocity moments, the amplitude of the linear matter
power spectrum, $\sigma_{8}$, and the growth rate of density perturbations at z
~ 0.1. Results obtained from this approach agree well with the predictions of
the $\Lambda$CDM model and are consistent with the reported ~ 1% zero-point
tilt in the SDSS photometry.
