I really liked the AllSeason bulbs when I had them on my Passat because it really cut down the glare in the rain and fog. Plus, they look neat during the day because at certain angles you can see the purple reflection of the bulb. There is no purple/blue tint to the light at all. In fact, the light beam is slightly yellow.

Stock H4 bulb Osram Allseason Slight yellow tint Stock vs. Allseason Allseason vs. Stock low beam Allseason vs. Stock low and fog beams Allseason vs. Stock high beam - outside Allseason vs. Stock high beam - inside Sequoia vs. Passat Osram Allseason With the light off, you can see the purple  reflection of the bulb. Osram Allseason With the light on, the purple tint is not visible. Halogen vs. HID Halogen vs. HID