Yellow bulbs FTW!!You're catching on. For the most part any claims for ultra white/pure white, 55W = 100W whatever the hell they say is bullshit and serves the purpose of selling bulbs rather than illuminating the road.
Kelvin ratings are deceiving and the actual color varies depending on the intensity of the light source. The 9011's are definitely not yellow. They will be white and less yellow than whatever is in there now because they simply have a higher light intensity.
HID PNP kits have destroyed any meaning to what color temperature actually implies.
The crystal visions have a bit of a blue filter but IMO it is not as thick as some of the others I've seen. I believe them to be good bulbs but truth be told any time you add a filter you're reducing your output. Phillips makes a quality bulb, so I don't think you're giving up anything going with the crystal vision line.
The exception is HID's of course because their salt mixture actually dictates the color in which they burn at. So it is possible to achieve 3200 lumens from a bulb at 4300K without giving up anything. Generally the more blue salt mixtures (4300K and above) are less efficient and you lose lumens, although the blue color appears brighter it has less illumination power generally and has a tendency to reflect off of surfaces.
Blue colors appear more intense even when they might not actually be because the color is much harder on your eyes and is perceived to be more intense. Hence why everyone seems to think those expensive silverstar/ZXP bulbs are the shit....Well, they are shit.
Why would you put in bulbs with a filter that lets light with more propensity to glare through, but reduces the light that penetrates farther?