M-Class (W166) Produced 2012-2015

Replace headlight light bulbs with LED

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Old 01-03-2019, 12:55 PM
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Unhappy Replace headlight light bulbs with LED

Hi,
I would like to replace the original halogen headlight light bulbs with LED light bulbs...
Can someone recommend the right brand and size... it seems like there are so many options. There are LED's with fans and fanless... etc...

I've also read some comments about not being able to fit the LED because they are larger than the regular stuff. Please help me out.

P.S.
Should I stick with HID's? is it better?
Old 01-03-2019, 01:27 PM
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Originally Posted by shevzor
Hi,
I would like to replace the original halogen headlight light bulbs with LED light bulbs...
Can someone recommend the right brand and size... it seems like there are so many options. There are LED's with fans and fanless... etc...

I've also read some comments about not being able to fit the LED because they are larger than the regular stuff. Please help me out.

P.S.
Should I stick with HID's? is it better?
I just did the HID conversion with AZN Optic's kit. The 5500k temperature bulbs look exactly the same temperature as the lighted star -- it's a vastly improved look outside the truck, and from the inside driving at night.
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shevzor (01-03-2019)
Old 01-03-2019, 02:31 PM
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Also, are there any videos online that show how to properly do everything?
Old 01-03-2019, 02:41 PM
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Originally Posted by shevzor
Also, are there any videos online that show how to properly do everything?
Not for the ML specifically, at least in all my looking. But I used this as a guide

Best piece of advice -- don't go in through top of engine, remove access panel in fender lining -- turn wheel all the way to left or right and you'll see the small panel where you can easily get up to the low beam.
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Old 01-07-2019, 12:45 AM
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Read this thread: https://mbworld.org/forums/m-class-w...eadlights.html
I give specific parts to buy. Instaling isn't hard.
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Old 01-15-2019, 05:12 PM
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Originally Posted by we47b1me
I just did the HID conversion with AZN Optic's kit. The 5500k temperature bulbs look exactly the same temperature as the lighted star -- it's a vastly improved look outside the truck, and from the inside driving at night.
How did you install the bulbs?

I've tried to retrofit the lows/highs in my 2015 ML350...it's been a nightmare. The bulbs WILL NOT GO IN. Even with the H7 adaptors. No matter what I do, the bulbs simply will not insert into the sockets.
Old 01-15-2019, 05:15 PM
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Originally Posted by JD101b
How did you install the bulbs?

I've tried to retrofit the lows/highs in my 2015 ML350...it's been a nightmare. The bulbs WILL NOT GO IN. Even with the H7 adaptors. No matter what I do, the bulbs simply will not insert into the sockets.
You're doing something wrong then. Take a picture of existing bulb apparatus and post. Did you buy the AZN kit?
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Old 01-15-2019, 05:18 PM
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I will when I get home. Thanks for the reply. I bought a Fluxbeam kit, though it looks the same as an AZN Optics bulb, at least in photos.
Old 01-15-2019, 05:21 PM
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Originally Posted by JD101b
I will when I get home. Thanks for the reply. I bought a Fluxbeam kit, though it looks the same as an AZN Optics bulb, at least in photos.
If you took out an H7 bulb, and you're replacing it with an H7 bulb, there's no way it won't fit unless you're taking out the high beam and now the low beam. But send pictures later.
Old 01-15-2019, 05:32 PM
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Originally Posted by we47b1me
If you took out an H7 bulb, and you're replacing it with an H7 bulb, there's no way it won't fit unless you're taking out the high beam and now the low beam. But send pictures later.
Thanks.

It's hard to see inside the assembly given the nature of the design. These lights are specifically meant for the low beams. When I push the bulb into the assembly, I hear a lot of metal-on-metal noises (when I push and turn the bulb) but nothing "engages". It feels like one metal disk is spinning on another metal disk.
Old 01-15-2019, 05:38 PM
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Originally Posted by JD101b
Thanks.

It's hard to see inside the assembly given the nature of the design. These lights are specifically meant for the low beams. When I push the bulb into the assembly, I hear a lot of metal-on-metal noises (when I push and turn the bulb) but nothing "engages". It feels like one metal disk is spinning on another metal disk.
Probably bought the wrong adapter. Don't know which one came with that kit, but the AZN one referenced earlier works perfectly. Assume you're going in through wheel well access hatch?
Old 01-15-2019, 05:40 PM
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I bought the adaptor specifically for the ML350 - H7 adaptor. The company I bought it from (they included it with the bulbs) said it should work for all H7 bulbs.

Yes, I'm going through that pain in the *** wheel hatch.
Old 01-15-2019, 11:26 PM
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Originally Posted by we47b1me
Probably bought the wrong adapter. Don't know which one came with that kit, but the AZN one referenced earlier works perfectly. Assume you're going in through wheel well access hatch?
https://i.imgur.com/AW3OXzv.jpg

I should mention that I did have the H7 adaptors on this bulb before I took them off - they didn't really stay in place, and I couldn't get the bulb deep enough into the socket with it on for some reason.

I also have LED's from headlight experts.com for the high beams - same exact problem, except with those the H7 adaptor seems to fit more securely on the bulb.

I've tried literally for hours to get these bulbs to properly install, with and without the adaptors. The stock halogen bulbs screw right in, so I am honestly at a loss as to why these damn bulbs just don't work.

Thanks in advance.

Last edited by JD101b; 01-15-2019 at 11:30 PM.
Old 01-15-2019, 11:33 PM
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Originally Posted by JD101b
Yeah that's not going to work. The dust cover will never close. And hard to tell what I'm looking at without the Euro adapter for the H7 on.
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Old 01-15-2019, 11:56 PM
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Tomorrow I'll see if I can dig out the adaptors. Like I said, despite coming from the company, they didn't seat quite right on the bulb. I'll also take pictures of the headlight express bulbs which I purchased. As I said those H7 adaptors fit well on the bulb, but I tried installing them in the low beams with much the same result (the seller stated that the bulbs would fit both low and high beams).

Thanks.
Old 01-16-2019, 12:00 AM
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Originally Posted by JD101b
Tomorrow I'll see if I can dig out the adaptors. Like I said, despite coming from the company, they didn't seat quite right on the bulb. I'll also take pictures of the headlight express bulbs which I purchased. As I said those H7 adaptors fit well on the bulb, but I tried installing them in the low beams with much the same result (the seller stated that the bulbs would fit both low and high beams).

Thanks.
This is what you bought?

http://www.opt-7.com/fluxbeam-led-headlights/#
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Old 01-16-2019, 12:10 AM
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That looks right.
Old 01-16-2019, 12:11 AM
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Originally Posted by we47b1me
That looks right.

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