  We analyze future direct data matter detection experiments using Effective
Field Theory (EFT) operators with light, $\lesssim 100$ MeV mass mediators. We
compare the nuclear recoil energy spectra from these operators to the predicted
high energy solar neutrino spectrum. A set of operators that generate spectra
similar to the neutrino background is identified, however this set is distinct
from those that mimic the neutrino background for heavy, $\gtrsim 100$ MeV mass
mediators. We outline a general classification scheme based on momentum
dependence of the dark matter-nucleus interaction to determine how strong the
discovery limit for a given operator saturates in the presence of the neutrino
background. Our results highlight the benefit of considering a general
theoretical framework regarding dark matter, and motivate continued
experimental progress towards lower nuclear recoil energy thresholds.
