We investigate light transport in three-dimensional disordered media composed of irregular dielectric particles using large-scale full-wave simulations. For subwavelength particles with a size parameter $kr\approx 1$ and high refractive index contrast, we observe a crossover from diffusion to a regime characterized by nonexponential decay of time-resolved transmission as disorder increases. The corresponding time-dependent diffusion coefficient decreases with time and approaches a $t^{-1}$ scaling at long times. This dynamical slowdown is accompanied by the emergence of spectrally isolated transmission resonances with Thouless conductance below unity, indicating the dominance of long-lived modes with weak spectral overlap. The late-time near-field maps reveal evolving, nonpropagating clusters of intensity hot spots. Together, the transport, spectral, and near-field signatures provide converging numerical evidence consistent with the onset of Anderson localization of light in three-dimensional disordered dielectric media.

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• Anderson localization
• Scattering theory
• Random & disordered media