To derive Anderson localization of light is one of the holy
grails of our time. I show in this talk theoretical results
derived by Vollhardt-Wölfle theory of photons in a novel time
dependent approach. The results are given for 3D disordered, finite 
sized real world systems of poly-disperse powders consisting of TiO_2 
Mie spheres. Signatures of  Anderson localized states, namely
interference effects, are determined and they can be
clearly distinguished from long living light-matter bound states as
well as frequency converted photons and losses. Influences of
different types of non-linear effects are discussed.