Another thing to watch out for is excessive shock to the bulbs when they are on or still hot, i.e. closing the hood when they're on or if your regular route is full of pot holes. The bulb filament is just a wee little metal spring and it gets super hot when it is on, any big vibrations will cause them to break. Found this out the hard way on a brand new set of the Silverstars when I shut the hood and they were on.
Plus, as noted on the package, those bulbs do not have a very long life to begin with. If you simply must have that white light, you'll have to deal with the short life span. In the long run it might be cheaper to use longer lasting bulbs and put in a nice set of driving lights for additional lumens on the road.
