H7 HID changed colour! - BMW Luxury Touring Community
 
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post #1 of 4 Old Aug 31st, 2012, 5:11 am Thread Starter
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H7 HID changed colour!

I've just noticed over the last couple of days that my H7 low beam HID (bought as part of a Fashtek group buy back in 2007) has started going blueish, probably looks more like 6000+K now, rather than 4300K that I installed.
I've read on some car forums that this is not unknown, although I haven't found an explanation for it yet... maybe our friend mr XenonDepot can advise?

Guess its not bad that it's lasted well over 5 years, but I'll replace it as I don't like blue-tinged headlights.

Looks like I can get a pair of new H7's for $50 in Oz from a place in West Oz. They don't say what brand they are though. I guess any auto-electrical store might carry them too. Jaycar has a H7 globe for around $25 too... guess that's about a standard price?
Seems Philips globes are near twice the price of "standard" globes? Are they really better? What's the difference between a generic H7 and a Philips H7?

cheers

Chris
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post #2 of 4 Old Sep 16th, 2012, 5:52 am Thread Starter
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Re: H7 HID changed colour!

Bought a pair of 4300K H7's on ebay for $26 (exactly same as originally supplied by Fashtek), so now I have a spare for in another 5 years time. :-)
Stripped down the nose cone to access all the wiring easily and installed the new HID. Nice to have "white" light again.

The 5 year old 4300K HID went quite blue....




the new 4300K HID

Chris
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post #3 of 4 Old Sep 16th, 2012, 10:24 pm Thread Starter
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Re: H7 HID changed colour!

finally found what seams to be some reasonably informed information about the colour shift
from: http://faqlight.shopower.com/hl-hid-bulbs.htm
What is color shift?

The labled light color on an HID bulb is an average that it will maintain over 2-3000 hours. After passing around 100-500 hours the phenonmen "color shift" will take place. Color will change slightly from a yellowish tone to a crisper bluer tone. The magnitude of color shift will vary depending on brand, model and rated color. It is a very gradual change and unless paid close attention to, a customer might not notice. OEM 4100K Bulbs manufactured by Philips has been reported to have a more noticeable color shift than OEM 4100K Osram. OEM 4100K Bulbs manufactured by Philips has a colorshift of approx 250K after 500 hours, which will bring it to up to 4350K.

Asian manufactured bulbs has been reported to have little or no color shift. Most of them come with output stealing blue filters, which may be part of the cause.

Chris
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post #4 of 4 Old Sep 19th, 2012, 10:43 pm
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Re: H7 HID changed colour!

That color shift is well known and normal. It is small enough that it usually goes unnoticed unless you have a brand new 4100K one for comparison.
The much larger shift you originally described occurs near the end of life. Often its accompanied by starting behavior changes. When it happens it is your last warning that its time to get a new bulb before it fails completely.
5 years is a fairly typical life for an always on HID in typical driving. Contrary to the belief of some, they don't last forever, just several times as long as a halogen bulb.
The name brand makers have more consistent quality than most of the Asian cheapies but if your basic install already has copycat ballasts I don't see a reason to spring for the more expensive bulbs.

Last edited by racer7; Sep 19th, 2012 at 10:59 pm.
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