Hi. In principle, verify a correct alignment of the headlights and their internal condition of the optics that lose their luminosity due to deterioration. Of course it is not a solution to increase the wattage capacity of the lamps, especially in vehicles with wiring of several years, this can cause an overload in the commands or circuits. On the other hand, the cables lose their conductive power due to temperature and aging, in addition it is necessary to verify the corresponding lands with their terminals. For all these situations it can be a high cost to change wiring and improve the factory condition after a check, an alternative is to install additional independent headlights (there are many alternatives and models) to improve the brightness. Salu2.