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Old 06-21-2009   #1
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Join Date: Oct 2008
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Bi-Xenon bulbs

Just had my Touareg since October, and now the DRL/Lowbeam bulb went out. Dealer quoted 250.00 per bulb and 50.00install. I ordered and OEM Bi-Xenon bulb from partsgeek.com at 105.00. What I am wanting to know is, I've been told that you should change both sides at once, however I just checked my lights, and the one is burned out, but also the high beam doesn't work as well, if the low beam bulb goes out, would that make the high beam go out as well? hopefully I'll just have to replace the low beam/DRL on each side. Help,,thank you in advance

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Old 06-21-2009   #2
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Because the "high beam" isn't really a high beam - it's one bulb which acts as high/low (not to be confused with a dual filament incandescent bulb like on the MkIV Jetta's).

Located in the headlight unit is a flap which flips up when you turn (or flash) your highs on, allowing 100% of your light to be exposed. When the flap is down, and your low beams on, only maybe 50% of your light will shine through. Roll your window down and then flash the highs, you can hear the flap flipping up/down.

So the high beams are really the low beams, but that flap opens up fully to let more light out.
That's also why when you turn your high beams on at night, you don't get more light down low where the low beams were already shining, but rather more light up high (and down the road).

Make sense?

And yes, it would be ideal to change your bulbs at the same time due to temperature change.

Your stock bulbs are (or should be) OEM 4300k. As time goes on, they "heat up" in temperature, turning bluer. Granted, your lights aren't that old, so you will have to make the call on that one. It all depends on how many hours you have on the bulbs, and if your DRL's have been disabled. If they have been disabled, that dramatically decreases the time the hid's have been on - saving the life of the bulb/ballast.

Maybe go elsewhere (your local VW tuner) for bulbs. You should be able to get OEM Bosch bulbs from Germany for MUCH less than the dealer is charging you.

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Old 06-21-2009   #3
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Please review this post: OE Philips bulbs are available for reasonable money.

What do you think about Bi-Xenon OE Phillips bulbs at a compelling value?

Give me a call if you wish?

Geoff
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Old 06-21-2009   #4
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Did I say Bosch(!?). I meant to say Philips. Thanks
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