Steve pretended :
Ok, being as no one could give a definitive answer I got a couple of each to try. Whilst my eyes can't really see much difference between the two, I have to say that I'm well pleased with the final result. You may think differently but, for my eyes and preference, the 6000K look
*very* bright in our car at night, which is exactly what I wanted. The car has a black leather interior and black carpets so the 'whiteness' of the 6000K against that is excellent. I got them from here and can highly recommend them: