Oh, sorry, I hadn't realised you were asking for advice on headlights too.
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Have you only got the stock lenses in place?
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Decision 1: Stay halogen or go HID?
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HIDs will scatter light awfully and dazzle oncoming cars if installed in stock lenses.
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They're better installed in Raybrigs or Rogue units.
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Either way, they may well make you fail your MOT.
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Decision 2: Colour temperature?
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As I said above, the temperature of your
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"white" is what you'll be looking to match.
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The bluer you get, the less light you're putting out onto the road
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- 3000k-3500k tends to give the best illumination.
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Halogens range from about a yellowish 2000k to a nearly daylight neutral 3000k for the premium units.
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Anything bluer than that tends to involve tinting the bulb's glass and thus reducing the light output.
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HIDs Can start as low as 3000k, but, as I said about, 4300k is more common, which is as near as makes little difference daylight neutral.
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High colours
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(6000k and above) reduce light output and again start to look rather blue.
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Decision 3: Finding 501s to match.
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Standard 501s will match standard Halogens.
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Once you get a premium halogen, a standard 501 will look rather yellow, but there are xenon matching 501s around, which should also match 4300k HIDs relatively well.
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Once you're up at 6000k, you really want an LED 501 to even attempt matching the colour.
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My advise would be to avoid a HID install or cheap
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(read c**p) blue tinted bulbs like you posted there and get some quality halogen bulbs, together with some 501s designed to match factory fit HIDs.
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Having driven with standard halogen in stock lenses, 6000k HIDs in Raybrigs and Osram Nightbreakers in Rogue quads
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(each with matching sidelights as detailed above) I can easily and honestly say the best to drive with are the Osram Nightbreakers with the Philips Blue Vision 501s.
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That's what I would recommend to fit to any of the headlight options available, particularly if you're running the standard lenses.
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