I've wasted a huge amount of money on headlight bulbs over the past two years, and therefore can give you a breakdown of all the ones I've tried:
This post is a copy-and-paste of one I made on the Fiat forum, I'm sure you know most of what I'm saying already :-) But can't harm to have it one here
<<The Legal Stuff>>
Blue light on the road is illegal, white light must not have excessive blue tint for MOT purposes. Many manufacturers fit very high colour temperature HID kits (read: blue) as standard. Make of that what you will.
All blue tinted bulbs will steal light, make the bulb's output dimmer. If you want brighter headlights you don't want blue bulbs. Blue tinted bulbs are good for styling only :-)
These are the bulbs I've tried: in order from white to blue.
-Philips Xteme Vision (Very Yellow, like standard, not much brighter either)
-Osram Nightbreaker (Looks whiter compared to the Philips but still undeniably yellow), a little brighter than stock)
-Ring XenonMax (Is the brightest 55W bulb I've ever tried. It is almost as white as the Arctic White below but you'd still call it yellow...)
-Ring Arctic White (Is noticeably whiter than the previous two but looks yellow still compared to HID or white LED sidelights)
-These bulbs from ebay: LINK
Are what I use currently. They are white, the light they cast on the road looks *slightly* blue sometimes but to look at, in the headlight they look white with a slight blue tint. They have a very strong blue tint on the bulb, but they shine white and look nothing like as blue as a HID conversion would. (i.e. they don't look chavvy!) They ARE E-Marked, unlike most ebay bulbs and they're pretty good quality. The light they give off isn't blue, but they will show up your standard sidelights as looking yellow, even my Philips BlueVision sidelights look very yellow compared to these bulbs. I'm happy with them. After 6 months about 15,000 miles of mostly night driving one bulb has become intermittant. I think that's a pretty good life for an unbranded ebay bulb!
Most importantly, they are near as makes no difference as bright as standard bulbs. (all tints steal *some* light)
It makes the car look so much newer having a clean crisp white light!
As an aside, I use yellow tinted Ring All Weather for the foglights (which should only be on in fog). They don't make that much difference but definitely don't use blue tinted bulbs in foglights! Will just bounce off the fog and make glare!
I use the Ring XenonMax for the full beam and can see for miles! And they've been in nearly 6 months (~15,000 miles of mostly night driving) and haven't gone yet!