We present a spectroscopic analysis of white dwarfs found in the Kiso survey . Spectroscopic observations at high signal-to-noise ratio have been obtained for all DA and DB stars in the Kiso Schmidt ultraviolet excess survey ( KUV stars ) . These observations led to the reclassification of several KUV objects , including the discovery of three unresolved DA+DB double degenerate binaries . The atmospheric parameters ( T _ { eff } and \log g ) are obtained from detailed model atmosphere fits to optical spectroscopic data . The mass distribution of our sample is characterized by a mean value of 0.606 M _ { \odot } and a dispersion of 0.135 M _ { \odot } for DA stars , and 0.758 M _ { \odot } and a dispersion of 0.192 M _ { \odot } for DB stars . Absolute visual magnitudes obtained from our spectroscopic fits allow us to derive an improved luminosity function for the DA and DB stars identified in the Kiso survey . Our luminosity function is found to be significantly different from earlier estimates based on empirical photometric calibrations of M _ { V } for the same sample . The results for the DA stars now appear entirely consistent with those obtained for the PG survey using the same spectroscopic approach . The space density for DA stars with M _ { V } \leq 12.75 is 2.80 \times 10 ^ { -4 } pc ^ { -3 } in the Kiso survey , which is 9.6 % smaller than the value found in the PG survey . The completeness of both surveys is briefly discussed .