Touched the halogen bulb, should I re-install it? - Mercedes Benz SLK Forum

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#1 Old 07-09-2012
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Touched the halogen bulb, should I re-install it?

Just done changing my low beam halogen bulb, it's really a narrow space and hard to reach, I have to touch the halogen bulbs somehow in order to complete the installation.

I did make sure my hands are clean and "mostly" oil free since I washed my hand with alcohol-base cleaner(I figure even though I wear a glove, the narrow space will still get a little dust on the glove and eventually on the bulbs). During the installation I clean the bulbs with microfiber towel and push the bulbs in the housing. I'm pretty sure during the last step of the entire process I touched the bulb couple times just a tiny little bit to pushed the bulbs in.

I did several researches and found it might cause the bulb to explode or shorten the lifespan.

Question: Should I re-install the halogen bulb again or do i really have to?(I will probably end up touching it again). Will touching the bulb really cause that "Big" of damage to the bulb?

Or should I just replace it with LED low beam?

Thanks in advance, I really don't want to re-do the entire process again since it's really hard to reach, just wondering if i don't re-install it, will it really make a big difference(such as the bulbs explode in couple weeks)?

PS: I rarely drive at night time.

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#2 Old 07-09-2012
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I say to leave it and take the chance on them. Not sure if this is a fair comparison, but my kitchen under-cabinet lights are halogen too, and I installed them after my wife and kids inspected them with their hands, and I didn't clean them and they are still working after 4 years or so.

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#3 Old 07-09-2012
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The contaminant on the glass is what causes the H7 lamp to shorten its life by degrading the glass, especially skin oil, when the lamp is lit.

Did you remove the front tire and front wheel well liner for the installation process? If you are able to clean the glass with isopropyl alcohol and air-dry or blow-dry with hair dryer at low temp. You should be Ok.

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#4 Old 07-09-2012
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Next time get some latex gloves if you feel you must touch the bulbs.

Not sure how the H7 install is different from the D2S, but on that one you can do the entire removal and install by only touching the back end of the lamp, never the glass.
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#5 Old 07-09-2012
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I've used both nitrile and vinyl gloves in the past to change bulbs in the ML350 I've driven. No problems... Nitrile and vinyl gloves are better than the latex ones.
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#6 Old 07-09-2012
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What they said - if you touched it, clean it.



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#7 Old 07-09-2012
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... thought it was... "you touch it you buy it"
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Like Eddy said - if you take the front wheel off first it's all right there in front of you. No access problems at all. Even if you turn the wheels fully and go in through the wheel well with the wheel on it's better than going in from above. Taking the wheels off will lengthen the procedure by an hour, but if you've never done it you'll learn a lot about that area of your car. Take pictures for future reference. In addition to the headlights the fog lights, parking lights, air temp sensors, and brakes are all in that area.

Just remember - use jack stands to hold up the car. If you haven't had the wheel off recently then use Woolly's (or was it John's?) trick of loosening the wheel by backing of the lug bolts a half a turn before you jack it up and work it back and forth a couple of times in drive and reverse with moderately hard braking. Then they'll come off easy.
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#9 Old 07-09-2012
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If you touched it "just a little bit" I wouldn't worry about it. It willnot shorten the lamp life. The concern is that transferred acids can make the quartz material of the lamp matt or theoretically evaporate and make the reflector matt. All more theory if you just touched it a little bit. I worked in the lamp industry for 25 years...
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#10 Old 07-09-2012
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Thanks everyone! I will leave it there for couple weeks and see what happened!
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#11 Old 07-09-2012
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Originally Posted by Helix View Post
If you touched it "just a little bit" I wouldn't worry about it. It willnot shorten the lamp life. The concern is that transferred acids can make the quartz material of the lamp matt or theoretically evaporate and make the reflector matt. All more theory if you just touched it a little bit. I worked in the lamp industry for 25 years...

That's an interesting take. The manufacture says it's to prevent creating hot spots on the glass that can cause excessive thermal stress that can results in cracks.

EDITED : Specifically for high temperature bulbs.



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#12 Old 07-09-2012
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UK-C200, yes that's also correct. Again ...in theory. Imagine a dirty engine oil finger print on the quartz envelop for this case.
These days manufacturer are very carefully with warnings just in case "something" happens and somebody asks for compensation.
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#13 Old 07-09-2012
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Quote:
Originally Posted by UK-C200 View Post
That's an interesting take. The manufacture says it's to prevent creating hot spots on the glass that can cause excessive thermal stress that can results in cracks.

EDITED : Specifically for high temperature bulbs.
That is also what I had heard. I've actually had a bulb in my fridge blow because of this: took it out, mishandled it, screwed it back in. Next time it came on it actually blew up in a few seconds, as in the glass bulb physically broke.
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#14 Old 07-09-2012
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Originally Posted by Durkatlon View Post
That is also what I had heard. I've actually had a bulb in my fridge blow because of this: took it out, mishandled it, screwed it back in. Next time it came on it actually blew up in a few seconds, as in the glass bulb physically broke.
That's some serious "skin oil".

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#15 Old 07-09-2012
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Just took out the low beam bulbs, will clean it later on when I got extra free time!

Also found that the high beam and low beam bulbs are a little different (even though both are H7)

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#16 Old 07-09-2012
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Prolly different manufacturers/suppliers.

Personal preference: I would use Philips X-treme H7 instead of the OEM ones, both for high and low beam application. I have them on my fog lamps that they give out more light/lumens. MB has also the same bulbs supplied by Philips and re-branded MB.

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#17 Old 07-09-2012
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Originally Posted by etyu View Post
Prolly different manufacturers/suppliers.

Personal preference: I would use Philips X-treme H7 instead of the OEM ones, both for high and low beam application. I have them on my fog lamps that they give out more light/lumens. MB has also the same bulbs supplied by Philips and re-branded MB.
Got it. I also agree with you with the Philips X-treme H7, after I purchased four OEM H7 bulbs(cost me $25 total..), a friend of mine told me there's a better option.. So I soon placed order for two pairs of Philips X-treme H7, now I don't know what to do with the four brand new OEM H7 bulbs I just received couple days ago.. wasted $25
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#18 Old 07-09-2012
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..... now I don't know what to do with the four brand new OEM H7 bulbs I just received couple days ago.. wasted $25
Is it not possible to return them to the MB parts department? Clean them up well and re-package them well, so that they are still in sell-able condition, and bring the receipt. Tell them it doesn't give enough light.

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#19 Old 07-09-2012
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Is it not possible to return them to the MB parts department? Clean them up well and re-package them well, so that they are still in sell-able condition, and bring the receipt. Tell them it doesn't give enough light.
Roger that!
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