Do HIDs lose brightness over time?
#1
Audiworld Senior Member
Thread Starter
Do HIDs lose brightness over time?
My kids refuse to drive the C5 at night because they say the low beams are worthless(their words) especially in rain. Picked up the other car from service tonight and they followed me home. I must say, the beams were not bright at all. With a line of cars behind and me looking in the rear view, it was really apparent. Driver side was definitely not as bright as passenger side.
Even with a proper adjustment, still didn't seem to improve things and driver side does seem less bright. Definitely not as bright as the C6.
Even with a proper adjustment, still didn't seem to improve things and driver side does seem less bright. Definitely not as bright as the C6.
#2
AudiWorld Super User
Yes they do and the pink start up color means the end is near.
I noticed last year the same thing but I lost one so I replaced the original nine year old lamps with new ones and the brightness was on the money again.
I noticed last year the same thing but I lost one so I replaced the original nine year old lamps with new ones and the brightness was on the money again.
#3
Audiworld Senior Member
Thread Starter
Haven't seen the pink start up color yet, but both give a brownish yellow edge to the top of the beam. Since my adjuster screw gears are stripped, wondering if I should replace the entire unit?
#4
AudiWorld Super User
New headlights are very expensive. You may try Bryan from audis4parts.com or Shokan for used ones.
HID bulbs do lose their brightness over time. Depending on usage, but noticeable after 6 years on average.
Another thing that can happen is the reflector will burn out its chrome and will have black spots inside. It will greatly reduce the output of the lights. In this case your option is to replace the headlight or buy a new projector with a reflector and retrofit to yours.
#5
Audiworld Senior Member
Thread Starter
If your adjuster screws are stripped, aren't your headlights dropped pretty much all the way down? That will give you next to nothing in visibility.
New headlights are very expensive. You may try Bryan from audis4parts.com or Shokan for used ones.
HID bulbs do lose their brightness over time. Depending on usage, but noticeable after 6 years on average.
Another thing that can happen is the reflector will burn out its chrome and will have black spots inside. It will greatly reduce the output of the lights. In this case your option is to replace the headlight or buy a new projector with a reflector and retrofit to yours.
New headlights are very expensive. You may try Bryan from audis4parts.com or Shokan for used ones.
HID bulbs do lose their brightness over time. Depending on usage, but noticeable after 6 years on average.
Another thing that can happen is the reflector will burn out its chrome and will have black spots inside. It will greatly reduce the output of the lights. In this case your option is to replace the headlight or buy a new projector with a reflector and retrofit to yours.
#6
AudiWorld Super User
I set them up manually and drove it around a bit (just push and pull the adjuster pins) and it helped a bit, but not much and yes, they do drop as I hit more and more bumps. Looking at the HIDs through the plastic outer cover with lights off, the interior glass (I'm guessing) is almost black on both of them. 10 years 198k miles, very much driving at night, guess it's time.
Someone was touting it a few weeks ago IIRC..lot less expensive than new assemblies.
#7
I set them up manually and drove it around a bit (just push and pull the adjuster pins) and it helped a bit, but not much and yes, they do drop as I hit more and more bumps. Looking at the HIDs through the plastic outer cover with lights off, the interior glass (I'm guessing) is almost black on both of them. 10 years 198k miles, very much driving at night, guess it's time.
If it is, I removed that gear completely and used a small Internal tooth lock washer to secure the post and used grip pliers to turn/level it. never had a problem after that.
HIDs do go "burn out" eventually. The main reason for that perceived reduced output is the fact that over time, the color temperature of the arc/light output shifts due to changes in chemistry inside the bulb (halides & electrodes etc.). A stock Phillips bulb will be around 4100kelvin and it goes up after use. The higher it goes, the less our eyes can see. That's why those people with 7000k etc. aftermarket New HID bulbs will have less "visible" light than the stock bulbs. Nothing to do with wattage here. Best bet is to replace them.
Another reason, the polycarbonate outer lens becomes opaque due to UV. Headlight sanding is the best option. Lastly, like it was mentioned, the projector lens is dirty or reflector bowls have dull/lost chrome. If you are handy, you can replace them. Otherwise, replace headlight.
Last edited by tester123; 01-01-2014 at 02:10 PM.
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#8
Audiworld Senior Member
Thread Starter
Are you talking about the pin where the plastic crown gear is? (see pic) The bottom white round gear..
If it is, I used a small Internal tooth lock washer to secure it and grip pliers to level it. never had a problem after that.
HIDs do go "burn out" eventually. The main reason for that perceived reduced output is the fact that over time, the color temperature of the arc/light output shifts due to changes in chemistry inside the bulb (halides & electrodes etc.). A stock Phillips bulb will be around 4100kelvin and it goes up after use. Best bet is to replace them.
Another reason, the polycarbonate outer lens becomes opaque due to UV. Headlight sanding is the best option. Lastly, like it was mentioned, the projector lens is dirty or reflector bowls have dull/lost chrome. If you are handy, you can replace them. Otherwise, replace headlight.
If it is, I used a small Internal tooth lock washer to secure it and grip pliers to level it. never had a problem after that.
HIDs do go "burn out" eventually. The main reason for that perceived reduced output is the fact that over time, the color temperature of the arc/light output shifts due to changes in chemistry inside the bulb (halides & electrodes etc.). A stock Phillips bulb will be around 4100kelvin and it goes up after use. Best bet is to replace them.
Another reason, the polycarbonate outer lens becomes opaque due to UV. Headlight sanding is the best option. Lastly, like it was mentioned, the projector lens is dirty or reflector bowls have dull/lost chrome. If you are handy, you can replace them. Otherwise, replace headlight.
#9
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