Hα luminosity functions estimated from J-PLUS DR1 at z ≤ 0.017. Left panel: HαLF estimated by the V_int/V_max technique from the Full sample (green dots), accompanied with the best-fitting Schechter distribution to these data (green line). The black line in this plot uses the same data, but a different weighting technique based on the Stellar Mass Function. Right panel: empty dots are the HαLF estimated using only the Blue sample, together with the best-fitting Schechter distribution to these data, once weighted by their stellar mass (blue line). For comparison we show the best Schechter fitting using the mass-weighted Full sample (black line, in common with left panel black line). We see that neither the weighting criteria nor the sample have a major impact on the best-fitting distribution. However, the mass-weighted samples allow us to explore 0.5 dex the faint-end slope of the distribution.