An analysis of high-resolution Stokes observations of two light bridges in the active region NOAA 8990 is presented. The observations were recorded with the La Palma Stokes Polarimeter attached to the Swedish Vacuum Solar Telescope. The stratification of different physical parameters is retrieved using the Stokes Inversion based on Response functions (SIR). Our results confirm the decrease of magnetic field strength and the increase of inclination in light bridges. We find a complex temperature stratification in these structures Coming out from the stratification of the magnetic field strength and the orientation of the magnetic field vector, we suggest a canopy structure above the light bridge. We derive the vertical component of electric current density (Jz). The increase of Jz corresponds to temperature enhancements that might be caused by the energy dissipation stored in the magnetic field.