  H.E.S.S. has recently completed a systematic survey of the Galactic plane in
the TeV energy domain. We analyze the flux, latitude and longitude
distributions of $\gamma-$ray sources observed by H.E.S.S. in order to infer
the properties of Galactic TeV source population. We show that the total
Milky-Way luminosity in the 1-100 TeV energy range is $L_{\rm MW} =
1.7^{+0.5}_{-0.4}\times 10^{37} {\rm ergs}\,{\rm sec}^{-1}$. Evaluating the
cumulative flux expected at Earth by the considered population, we show that
H.E.S.S. unresolved sources provide a relevant contribution to the diffuse
Galactic emission. Finally, in the hypothesis that the majority of bright
sources detected by H.E.S.S. are powered by pulsar activity, like e.g. Pulsar
Wind Nebulae or TeV halos, we estimate the main properties of the pulsar
population.
