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We study photon orbits in the background of $(1+3)$-dimensional static,spherically symmetric geometries. In particular, we have obtained exactanalytical solutions to the null geodesic equations for light rays in terms ofthe Weierstra{\ss} function for space-times arising in the context ofscale-dependent gravity. The trajectories in the $(x-y)$ plane are showngraphically, and we make a comparison with similar geometries arising indifferent contexts. The light deflection angle is computed as a function of therunning parameter $\xi$, and an upper bound for the latter is obtained.

Orbits of light rays in scale-dependent gravity: Exact analytical solutions to the null geodesic equations