A while back, I decided to try some of the Sylvania bulbs that they advertise as being brighter. I think they were called "Silverstar", or some such. Don't waste your money on them. They blew in a couple of months, whereas the OEM bulbs in my truck lasted about 6-7 years. I worked at Auto Zone for a while, also, and have heard many similar stories. Didn't believe them until I had it happen, myself.
I installed some regular Sylvania bulbs, and they've been going strong for a couple of years now.