If there are primordial black holes in the dark matter halo of our Galaxy, they must collide with the Galactic neutron stars (NS) and turn them into light black holes (LBH), with masses below 1.4 M_Sun. This process has several observational consequences that may be checked by microlensing, by LIGO-Virgo-Kagra iterferometers detecting gravitational waves from collisions of LBH with NS and BH, by detecting LBH in X-ray binaries and from pulsars statistics.