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07-30-2015, 09:15 AM | #1 |
Scooby Specialist
Member#: 187936
Join Date: Aug 2008
Chapter/Region:
MAIC
Location: Fairmont WV
Vehicle:19 WRX & WRX STi |
HID dark spot
I'm having a beam pattern issue
my drivers side looks like this: and the passenger side looks like this: I've had an issue before where the bulb popped loose, so I pulled the bulb out and reseated it, but that had no effect. My bulb looked like this one on the passenger side: http://forums.nasioc.com/forums/show...36&postcount=8
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07-30-2015, 10:48 AM | #2 |
Scooby Specialist
Member#: 5887
Join Date: Apr 2001
Chapter/Region:
BAIC
Location: Fremont, CA USA
Vehicle:2002 GDAA (bugeye) 797 (blaze yellow) |
It's quite hard to tell what's going on with a projection that close. Note that the beam shape (as seen on a flat surface like that) do not stay fixed as it comes out of the lens onward. You'd need to provide more info:
(1) Pattern on a wall 20-25ft away (or more) (2) What projectors (3) What bulbs (e.g. D2S, D2R, rebased aftermarket like H1, etc.) |
07-30-2015, 11:52 AM | #3 |
Scooby Specialist
Member#: 187936
Join Date: Aug 2008
Chapter/Region:
MAIC
Location: Fairmont WV
Vehicle:19 WRX & WRX STi |
working on the more info
(1) will get picture after work, I'll also swap bulbs from side to side to see if it follows (2) Stock STi projectors (3) Stock style bulbs, D2S |
07-30-2015, 01:47 PM | #4 |
Scooby Specialist
Member#: 5887
Join Date: Apr 2001
Chapter/Region:
BAIC
Location: Fremont, CA USA
Vehicle:2002 GDAA (bugeye) 797 (blaze yellow) |
It is possible that the return wire of the bulb is oriented incorrectly (e.g. bulb is upside down), but at such a close distance, the beam pattern can look very different from the regular driving distance pattern.
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07-30-2015, 09:51 PM | #5 |
Scooby Specialist
Member#: 187936
Join Date: Aug 2008
Chapter/Region:
MAIC
Location: Fairmont WV
Vehicle:19 WRX & WRX STi |
Here is the pattern
And it didn't change when I swapped bulbs, it didn't used to look like this, I just noticed the really reduced output on the passenger side earlier this week. |
07-30-2015, 11:36 PM | #6 |
Scooby Specialist
Member#: 5887
Join Date: Apr 2001
Chapter/Region:
BAIC
Location: Fremont, CA USA
Vehicle:2002 GDAA (bugeye) 797 (blaze yellow) |
^
If the projector's bowl has no obvious burn marks (that can happen even with OE projectors over time), then the position of the arc in the passenger side bulb is a bit off. If it were a biXenon (which it isn't), it would've been easy to check by switching to high beam mode; you'll see the hotspot sit high up above the low beam's cutoff. Many aftermarket bulbs (even one that is D2S based) are not necessarily produced with sufficient process control (or good design to begin with). As a result, the position of the HID arc may be a bit off. Some bulbs are very obvious to spot; those that lack a good support for the glass capsule. See those metal supports at the base of the capsule? Different brands come up with different ways of providing that support. I've seen some budget brands that don't even have that support. Instead, the capsule is fused directly into the plastic base. Not sure how they ensure proper alignment. |
08-01-2015, 10:37 PM | #7 |
Scooby Newbie
Member#: 427124
Join Date: Aug 2015
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Have you tried swapping bulbs from side to side to see if the problem follows the bulb? If you have and it's no different, your passenger side projector bowl is probably toast.
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08-05-2015, 08:31 AM | #8 |
Scooby Specialist
Member#: 198067
Join Date: Dec 2008
Chapter/Region:
Tri-State
Location: RAMSEY, NJ
Vehicle:2009 IMPREZA 2.5i 4d WHITE Premium |
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06-27-2016, 10:42 PM | #9 |
Scooby Specialist
Member#: 187936
Join Date: Aug 2008
Chapter/Region:
MAIC
Location: Fairmont WV
Vehicle:19 WRX & WRX STi |
Bump from the dead, the dark spot was caused by a burnt HID reflector:
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06-28-2016, 09:28 PM | #10 |
Scooby Specialist
Member#: 5887
Join Date: Apr 2001
Chapter/Region:
BAIC
Location: Fremont, CA USA
Vehicle:2002 GDAA (bugeye) 797 (blaze yellow) |
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08-26-2016, 09:49 PM | #11 |
Scooby Specialist
Member#: 64405
Join Date: Jun 2004
Chapter/Region:
E. Canada
Location: QC, Canada
Vehicle:2018 STi WRB |
If the bulb popped loose while turned on it is probably what caused the burn as the bulb could have sit directly on the bowl, or too close and burnt it.
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