Led Bulbs - Mercedes Benz SLK Forum
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#1 Old 6 Days Ago
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Thumbs up Led Bulbs

Hi,

Todays Topic is LED Headlights or more correctly Retrofit LED Replacement Bulbs.

The Market is Starting to Mature and Prices are Falling.

I can buy a Pair, H7/H4 -7,200Lm 60W 6000K Cool White CREE, in the UK for under 40 Kit from Amazon ( Not a known brand though).




The Other End of the Market -

Phillips are offering H4 & H7 LED Bulbs, Philips LUXEON ZES Headlight Kit - 4000 Lumens 6500k, 140.00 Kit Both are CANBUS Friendly.

The Phillips Kit - http://www.horizonleds.co.uk/headlamp-cree-led/5th-gen-4000-lumens

Both of the above examples come as a kit with an adaptor ring to go between the Bulb and the Headlamp Unit.
Also they have Resistor Circuitry to make it Canbus Friendly & an LED driver.
They are fitted with the correct plug to mate with the existing wiring.

-------------------------------------------------------------------------------------------------------------------------------------
TECHNICAL MOMENT
An LED driver is an electrical device that regulates power to an LED . Having one is very important in
preventing damage to your LEDs as the forward voltage (Vf) of a high-power LED changes with temperature.
Forward Voltage is the amount of volts the light emitting diode requires to conduct electricity and light up.
As temperature increases, the forward voltage of the LED decreases, causing the LED to draw more current.
The LED will continue to get hotter and draw more current until the LED burns itself out, this is also
known as Thermal Runaway. The LED driver is a self-contained power supply which has outputs that
are matched to the electrical characteristics of the LED. This helps avoid thermal runaway as the constant
current LED driver compensates for the changes in the forward voltage while delivering a constant current to the LED.

----------------------------------------------------------------------------------------------------------------------------------------------------------
The Dominant Technology that offers this kind of performance at the moment is that based on CREE Inc LED Chips
where a single or small number of chips are used. This makes the design of the Bulb easier to ensure a correct beam pattern.


--------------------------------------------------------------------------------------------------------------------------------------------------------
ANOTHER TECHNICAL MOMENT

A standard H4 Bulb (Halogen) puts out 1100-1500 lumens and draws 55-60 watts to do so.

International regulation ECE R37 specifies the luminous flux of the H4 bulb: 1650/1000 lumens 15% and max allowable wattage
75/68w @ 13.2v. The U.S. regulation 49CFR564 for the 9003/HB2 (U.S. designation for the H4 bulb) is similar: 1580/910 lumens
10% and max allowable wattage 72/65w @ 12.8v. The lumen differences are not the extent of the performance differences; the
filament changes required to make a long-life bulb tend to reduce the beam focus, which shortens seeing distance, and to reduce
filament surface luminance, which makes the light less white and more brown. The opposite filament changes are made to create
the "Plus" or "Hyper" (+30, +50, +80, +90) type bulbs: Lifespan is reduced, but the beam focus is better so seeing distance is longer.
Light color is whiter and less brown. The takeaway message here is that even if all the filaments put out exactly the same amount of
light the same lumens from a long life, a +30, a +50, a regular, an ultralong-life, etc. the headlamp performance and appearance
with the long-life bulb would still be inferior compared to the same headlamp performance and appearance with a regular, or +30, or
+50, or +80, or Hyper bulb.

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
There are some advantages to fitting LED Bulbs -

A/ Colour Choice - It can Vary between 4000k & 6500K (Soft White to VeryWhite)
B/ Most are designed to fit just like factory bulbs, no cutting or splicing any wiring looms. Some come with x2 Bulb Adaptors
C/ Response Time - quicker ON/OFF response compared to traditional bulbs, Xenons and standard SMD LEDs.
D/ Light Output market leaders offer 4000 Lumens per each bulb.Beware of the "Snake Oil"salesmen who make up the numbers.
I've seen some on Ebay claiming 20000 Lumens (10x standard bulb)
E/ Whilst heat output of the LED Chips is lower in the forward direction (better for plastic headlamp bodies)
The Design is such that heat is concentrated at the rear where the Heatsink is.
But watch out for hoses or plastic washer bottles in that Area.

Downsides -

A/ The Legality of Retrofitting LED Bulbs has not been defined in many Countries. This could be a problem with Annual Tests.
B/ The Branded bulbs have a much higher cost at present.
C/ They do not emit all-direction lighting which may cause problems with some reflector's.
D/ They are affected by high temperature.
E/ They are sensitive to electrical surges.
F/ They may flicker on occasions, based on the DC power supply built in the structure of the bulbs.
G/ The one's using cooling fans may have a shorter life than those relying on a larger heat sink. I would see this as a Major Problem.

OVERALL -

LED headlights bulbs can play a large part in improving driving safety. A car armed with LED headlights bulbs can improve
the situation in providing the illumination for it and also make itself visible to passing cars and people. One thing to keep in mind
when buying LED headlights bulbs is that users should never compromise on quality for price. Therefore, it is better to buy
branded LED headlights bulbs.

The above
contains my personal opinions on technology development & related topics.

HAS ANYONE EXPERIENCE OF FITTING LED BULBS ON THEIR SLK ???

PLEASE GIVE ME YOUR VIEWS ON WHEATHER YOU WOULD CONSIDER FUTURE FITMENT ??
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Last edited by ixion; 5 Days Ago at 04:12 PM.
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#2 Old 6 Days Ago
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I have leds in my Spyder H7 headlights and they're great, emitying 360 degrees light...

Here's a video of mine: https://youtu.be/Kp2t4lc17VY

What do mean by that they come with an adapter ring that goes between the bulb and the headlight unit?


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I just wonder if these bulbs are 'plug and play' or if any 'ammendment' needs to be made to accomodate the heat sinks?
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Some LED Bulbs need a Plastic to go between them and the hole in the Headlamp.

This allows them to make 1 Model of Bulb and fit it to many Models of car.
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No interest in them for either of my cars, given that I've only driven after dark once in the last 6 years (early morning run to Walmart after Mr. Coffee decided it was a good day to die). FWIW, house is a different matter. Aside from those in appliances where LEDs won't work, every light bulb in the place is LED and all my flashlights are LED too.

My biggest concern would be how 4000 lumen headlights might affect other drivers, given how blinding the light from a 900 lumen flashlight can be. Also wonder how often any safety benefit better nighttime vision provides will be negated by folks deciding they can now drive faster.
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Also wonder how often any safety benefit better nighttime vision provides will be negated by folks deciding they can now drive faster.


Nope, just want to see where I'm going, get's a bit dark out here in the countryside!
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And if the car coming the other way is dazzled by non-compliant lights, the LED equiped driver may get a great view of the car that crashes into them.

Lighting is a trade off between seeing better without impacting upon others.

Anytime when driving on a two-lane two-way road with the sun low behind and the vision out front is glorious, remember the car coming towards is staring straight into the sun and can't see much at all.

Same principle.

The lighting Arms Race will not serve us well. Only Manufacturer's well engineered and checked, modern adaptive lighting lighting offers real benefits, but that means buying a new car.

The effective filament position of LED bulbs does not reproduce that of the original bulbs, and as such in the very finely designed reflector, light will be projected not in the designed pattern, for sure.

Older drivers, any one over 50, are increasingly affected by glare as they age, that impares perception, so dazzling oncoming headlights is really dangerous.

The reason replacement headlights are not approved, and fail annual roadworthy checks, is because of this, not because "they" are out to spoil others fun.
Yet they are sold here marked " not certified", well what are people going to do with then, if not fit them illegaly to cars?

LED brake lights, that's another case altogether, because they light up so fast they give more warning to following drivers, at 100kph, even 1/10 second is 2.7 m more braking distance available.
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If the Headlamps are correctly set up using a Beam Pattern Machine there should be no problem.

However the same as HID's if they cannot be setup OK then forget it.

Be nice to hear from someone who had them fitted and aligned properly.
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Ixion,
Very good point.
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Been running led lights for both my dip/main beam bulbs and inner spot lights on my mustang since October. Really impressed so far plus it didn't need headlamp washers etc like hid lights.
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The problem with led light bulbs and the standard Slk headlights is that the bulb holder in the headlights is a piece of metal that slots under two screws

Xenon HID H7 Bulb Base Retainer Clips for BMW Mercedes Audi Saab VW Holders | eBay

and these cannot be fitted on the led buld due to the way they are constructed.
On the Spyder type headlights they can be fitted as they use the metal wire/spring type of fixing...


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Quote:
Originally Posted by curro101 View Post
The problem with led light bulbs and the standard Slk headlights is that the bulb holder in the headlights is a piece of metal that slots under two screws

Xenon HID H7 Bulb Base Retainer Clips for BMW Mercedes Audi Saab VW Holders | eBay

and these cannot be fitted on the led buld due to the way they are constructed.
On the Spyder type headlights they can be fitted as they use the metal wire/spring type of fixing...

So it would appear that these bulbs WON'T fit an SLK headlamp? True or false?
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Quote:
Originally Posted by grimree View Post
So it would appear that these bulbs WON'T fit an SLK headlamp? True or false?

I cannot be Absoutly certain as I do not have one in my possession.

Certainly on the Phillips Brand you can slide the heat sink off.

Click to the right under the main picture onto a small icon and you will bring up a diagram of this-
LINK 4000 Lumens LED Headlight Kit | Reversible Base

Shows Heat Sink Removeable.You will then have a Standard H7 Base to work on Which will take the ring and screws as normal. Then replace Heat Sink.



PHILLIPS 5th Generation H7

I've also had a look at a few on Amazon/Ebay and they seem to have the same capability.

Ultimatly Only answer is for someone to Buy a Pair and Report back to us
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Thumbs up Majority would be OK

Quote:
Originally Posted by grimree View Post
So it would appear that these bulbs WON'T fit an SLK headlamp? True or false?
Quote:
Originally Posted by curro101 View Post
The problem with led light bulbs and the standard Slk headlights is that the bulb holder in the headlights is a piece of metal that slots under two screws

Xenon HID H7 Bulb Base Retainer Clips for BMW Mercedes Audi Saab VW Holders | eBay

and these cannot be fitted on the led buld due to the way they are constructed.
On the Spyder type headlights they can be fitted as they use the metal wire/spring type of fixing...
================================================== =============
That may well be the case if you have the Xenon HID Headlamp Assemblies.

Certainly on my SLK (a R170) The Halogen bulbs are held by wire spring clips and I believe this is the case on R171 & R172 Model's.

So the Majority of SLK's Would accept the Upgrade
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Quote:
Originally Posted by ixion View Post
================================================== =============
That may well be the case if you have the Xenon HID Headlamp Assemblies.

Certainly on my SLK (a R170) The Halogen bulbs are held by wire spring clips and I believe this is the case on R171 & R172 Model's.

So the Majority of SLK's Would accept the Upgrade

Nope sorry, I had the standard H7 r171 headlamps and they use the metal clip as I mentioned rather than the spring, so no, the normal led bulbs aren't going to fit, but there's a pretty good chance that the type shown above with the removable base might. The other type that might fit are some of the ones that use the metal strips as their cooling system...


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My Sincere appologies - I own a R170 with spring clips so it was partly presumption on my part.

I was also going on someone's comment that a R171 Headlamp Bulb change was the same procedure as an R170.

I have since looked at a Clip in You Tube that clearly shows a Bulb Change on a R171with the Metal piece & 2 Screws being clearly visible.

Regards

Mike.
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No need to apologise at all, I only found out when I tried to fit some led bulbs before changing my headlights for the Spyer style ones!


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These MIGHT work, as the fixing is held in place first and then the bulb is slotted in place, but someone will have to be the Guinea pig and try them...:

CREE 160W 16000LM LED H7 Car DRL Headlights Hi Lo Beam Bulbs 6000K Super Bright | eBay


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led bulbs and fittings

Hi i have a 172 and my light filaments are held in with a spring and not the plate and 2 screws as per above. i have two pictures just need to make there size smaller to upload.
Attached Images
File Type: jpg IMG_2397.JPG (34.8 KB, 0 views)
File Type: jpg IMG_2396.JPG (30.6 KB, 0 views)

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