I purchased PIAA white bulbs for DRL in 2001 and havent had any burnt out or problems with them, I too was amazed how long it lasted, and because its PIAA, the price was not cheap back then. Used over 6-7 years until I changed to yellow drls.
But its definitely worth its price and quality.
Never tried philips, maybe someone else can shed opinions.
With foglights, I dont think yellow are acceptable, possibly white only. But isnt there a law that we cannot turn on fogs during driving, only be used for fog weather? But I do know that yellow fogs do cut into the fog for better visibility.
Good luck with your purchase.
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