The 9005 bulbs are high beam bulbs used in vehicles that have 4 headlights. They are slightly different and sometimes you need to trim the tabs to get them to fit.
The problem with 9005 bulbs are that they are designed to be high beams. Most people do not use high beams all the time, so when you use them in the fog lights, they seem to burn out quickly because of the higher wattage.
9005 bulbs are 65 watts with 320 HR life.
9145 bulbs are 45 watts with 1000 HR life.
So, esentially, what you gain in visibility, you loose in life of the fog light bulbs using 9005.
In case you are wondering about Silverstar bulbs, they are brighter then standard bulbs. Do a search on headlights. I few years back, I tested different bulbs under a semi-controled environment and the results were impressive. Someone here talked about the "Eurodezigns" bulbs and said how much brighter they were over Silverstars. I blew that theory into the dirt too.
If you are looking for a relativly cheap upgrade for your headlights, get 9007 HO bulbs.
I have never tested PIAA Hyper White bulbs, so I can't compare them to Silverstars, but Silverstars blew away all the others I tested.
Tom