Aftermarket HID bulbs in stock HID lamps weirdness - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 03-09-2010, 12:04 PM Thread Starter
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Date registered: Sep 2009
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Lightbulb Aftermarket HID bulbs in stock HID lamps weirdness

One of my stock D2R OSRAM HID headlight bulbs blew recently and I found some aftermarket (Generic) HID bulbs locally for quite cheap. I replaced the burnt out bulb, started the car, turned on the lights and things seemed to work fine.

Since it's recommended to replace these bulbs in pairs, and also because the new ones are 6000K as opposed to the stock 4300K colour temperature, I changed the still working stock bulb as well. Restart the car, try the lights and the just replaced bulb doesn't light up, but the first one I replaced still does. Figuring it's a dud bulb I replace it again with the original stock which ends up working fine again.

Now here's where the weirdness begins and my real question is. In the days following I find that the new generic bulb only lights some of the time. I trace it down to the fact that first thing in the morning when I start the car the generic bulb will never light and I get a "Check Lamps" error. (btw - this is a Canadian model 2002 E320, so it has stock daylight running lights that ignite the headlights when you put it in Drive). However, if I manually turn the headlights off, wait a moment, and then turn them on again they both light up. Furthermore, for the rest of the day both lights will ignite without trouble.

A day or two of this got me thinking that the second generic HID bulb might be fine. I swap it in for the stock HID bulb, start the car, manually turn on the headlights, one headlight ignites. I then manually turn off the headlights, wait a moment and then turn them on again and now both new generic HID bulbs ignite. Again, for the remainder of the day starting and stopping the car I have no more trouble with the headlights until the next day.

The simple answer is likely that I should just stick with the much more expensive stock OSRAM HID bulbs, but I was wondering if anyone has had similar experiences and/or might have an educated guess at what's going on. I've read about problems similar to this with HID conversion kits, but this is a stock HID system.

Thanks for any help.

Last edited by pdodee; 03-10-2010 at 08:14 AM. Reason: Spelling correction
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post #2 of 2 (permalink) Old 03-09-2010, 07:51 PM
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Its either the cheap bulbs or a bad ballast.
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