On the color scale, the SilverStar Sylvania headlights are up to four thousand Kelvin. This means that the light produced by these headlights is more or less like the natural day light. The regular halogen lights can produce a light of about three thousand Kelvin. So as compared to the regular halogen lights, it is always better to use the SilverStar Sylvania headlights. The lifespan of these headlights will depend on how long you are going to drive and it will also depend on the kind of vehicle that you own. Generally, the headlights will not be as bright, as they used to be, with the passing of time.