  Dark matter experiments primarily search for the scattering of WIMPs on
target nuclei of well shielded underground detectors. The results from liquid
scintillator experiments furthermore provide precise probes of very light and
very weakly coupled particles that may be absorbed by electrons. In these
proceedings we summarize previously obtained constraints on long-lived dark
matter vector particles $V$ (dark photons) in the $0.01-100$ keV mass range. In
addition, we provide a first projected sensitivity reach for the upcoming
XENON1T dark matter search to detect dark photons.
