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01-05-2016
Ok is led from <a href="http://ru.aliexpress.com/item/Runstreet-TM-9600lm-H7-Xenon-White-6000K-LED-Car-Automotive-Headlight-Lamp-Kit-Cree-XHP-50/32440082796.html" target="_blank">AliExpress</a> <br />
Old 06-07-2018   #15
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Re: LED Headlight

Quote Originally Posted by g8rpi View Post
Aftermarket LED replacements for halogen bulbs will nver have "good focus" or correct beam patterns. As of May 2018 the UK MOT includes a specfic check for headlight conversions so they are now much more likely to result in an MOT failure.

Robert G8RPI

This is an over-simplification for LEDs. Though if we were discussing HID burners I could only agree as the light source is HUGE compared to a halogen bulb filament HID burners in ordinary headlights are very bad news.

The latest LED bulbs have a row of three emitters on each side of an aluminium post. The emitters are the same size and height as the halogen filament. Not surprisingly, the dip beam focus is the same as with a halogen.

Technically they do not meet the Construction And Use rules so technically they are not roadworthy. However, they now focus just as well as halogen so the dangerous glare argument is debunked.
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Last edited by DaveMcT; 06-07-2018 at 22:07.
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Old 06-07-2018   #16
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Re: LED Headlight

Quote Originally Posted by DaveMcT View Post
This is an over-simplification for LEDs. Though if we were discussing HID burners I could only agree as the light source is HUGE compared to a halogen bulb filament HID burners in ordinary headlights are very bad news.

The latest LED bulbs have a row of three emitters on each side of an aluminium post. The emitters are the same size and height as the halogen filament. Not surprisingly, the dip beam focus is the same as with a halogen.

Technically they do not meet the Construction And Use rules so technically they are not roadworthy. However, they now focus just as well as halogen so the dangerous glare argument is debunked.

This shows a complete mis-understanding of these light sources (Halogen HID and LED). HID lamps have tiny light source, much smaller than the couple of square mm of a Halogen headlight filament. This the big advantage of HIDs The smaller the light source the more accurately you can shape the beam. Both HID and Halogen are effectively spherical (4pi) emitters. LED replacements for halogen lamps have much larger light sources than Halogen. The LED chips in the lampsstruggle to acheive a 100 degree conical illumnation so at least two are rquired. This is not an issue when the optics are designed for it but it's almost impossible to acheive a correct pattern in a lamp designed for halogen. Please don't spread this mis-information. I've designed lighting systems for laboratory instruments using all these light sources (including patented ones for specialist Halogen and HID applications) so know what I'm talking about.



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Old 27-12-2018   #17
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Re: LED Headlight

i find many people who complain of dazzle drive far too close to the centre of the road. if they moved closer to their own side of the road they would not be in direct line with oncoming headlights.
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Old 26-01-2019   #18
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Re: LED Headlight

Hi !

I have recently bought these LED "bulbs" from aliexpress :



link (as of 2019-01-26) : https://fr.aliexpress.com/item/Super-H7-Led-lamp-h1-h3-h11-h27-hb3-hb4-H4-Led-auto-Bulbs-Car-Light/32820845291.html?spm=a2g0s.9042311.0.0.40696c37RRO AVJ
for my Punto Sporting 2002.
(be aware that the "9000 lumen" mention on the box is for the two bulbs).


Each boxes contains 2 "bulbs" and is sold 15 euros, so I bought 2 boxes for 30 euros to get 4 "bulbs" for both low beam and high beam.
(Notice that on my 2002 Sporting, 1.2 16V, the format of the bulbs is H1, not H7)

There are two LED chip by "bulb".
Electrical power consumption is 32 watts for each "bulb" : that is coherent with the alleged 4500 lumen of luminous flux knowing that the efficiency of LEDs are commonly above 100 lumen/watt.

Installation is "finger is the nose" as long as you drop the front bumper (count an hour).
The cooling fan of each LED "bulb" is not too big to prevent the optical hood from closing, but it's just.


It lights up much better without dazzling other drivers and when in high beam, night vanishes (when in high beam, low beam "bulbs" stay on).

In France, we have no trouble with the law or with the "contrôle technique" (what you call "MOT").

Cheers and drive safe !

PS (note to G8RPI) : I don't understand your "dislike" but nevermind (the ********), I don't care ;-)
Likes AnteLo liked this post
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Last edited by Lightning; 26-01-2019 at 21:08.
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Old 27-01-2019   #19
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Re: LED Headlight

Quote Originally Posted by Lightning View Post
Hi !

I have recently bought these LED "bulbs" from aliexpress :



link (as of 2019-01-26) : https://fr.aliexpress.com/item/Super-H7-Led-lamp-h1-h3-h11-h27-hb3-hb4-H4-Led-auto-Bulbs-Car-Light/32820845291.html?spm=a2g0s.9042311.0.0.40696c37RRO AVJ
for my Punto Sporting 2002.
(be aware that the "9000 lumen" mention on the box is for the two bulbs).


Each boxes contains 2 "bulbs" and is sold 15 euros, so I bought 2 boxes for 30 euros to get 4 "bulbs" for both low beam and high beam.
(Notice that on my 2002 Sporting, 1.2 16V, the format of the bulbs is H1, not H7)

There are two LED chip by "bulb".
Electrical power consumption is 32 watts for each "bulb" : that is coherent with the alleged 4500 lumen of luminous flux knowing that the efficiency of LEDs are commonly above 100 lumen/watt.

Installation is "finger is the nose" as long as you drop the front bumper (count an hour).
The cooling fan of each LED "bulb" is not too big to prevent the optical hood from closing, but it's just.


It lights up much better without dazzling other drivers and when in high beam, night vanishes (when in high beam, low beam "bulbs" stay on).

In France, we have no trouble with the law or with the "contrôle technique" (what you call "MOT").

Cheers and drive safe !

PS (note to G8RPI) : I don't understand your "dislike" but nevermind (the ********), I don't care ;-)
this is why some people in the UK don't like the eu they make these rules on what bulbs can be used our mot follows them but no other country in the eu does.
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Old 27-01-2019   #20
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Quote Originally Posted by Lightning View Post
Hi !

I have recently bought these LED "bulbs" from aliexpress :



link (as of 2019-01-26) : https://fr.aliexpress.com/item/Super-H7-Led-lamp-h1-h3-h11-h27-hb3-hb4-H4-Led-auto-Bulbs-Car-Light/32820845291.html?spm=a2g0s.9042311.0.0.40696c37RRO AVJ
for my Punto Sporting 2002.
(be aware that the "9000 lumen" mention on the box is for the two bulbs).


Each boxes contains 2 "bulbs" and is sold 15 euros, so I bought 2 boxes for 30 euros to get 4 "bulbs" for both low beam and high beam.
(Notice that on my 2002 Sporting, 1.2 16V, the format of the bulbs is H1, not H7)

There are two LED chip by "bulb".
Electrical power consumption is 32 watts for each "bulb" : that is coherent with the alleged 4500 lumen of luminous flux knowing that the efficiency of LEDs are commonly above 100 lumen/watt.

Installation is "finger is the nose" as long as you drop the front bumper (count an hour).
The cooling fan of each LED "bulb" is not too big to prevent the optical hood from closing, but it's just.


It lights up much better without dazzling other drivers and when in high beam, night vanishes (when in high beam, low beam "bulbs" stay on).

In France, we have no trouble with the law or with the "contrôle technique" (what you call "MOT").

Cheers and drive safe !

PS (note to G8RPI) : I don't understand your "dislike" but nevermind (the ********), I don't care ;-)
Thanks for recommending those blubs, my punto is also 2002 and it has H1 lightbulbs. Do they fit under headlights cover?
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Old 27-01-2019   #21
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Re: LED Headlight

Slightly off topic but still on illumination, personally its those cars with rear LED clusters that are overly bright that irritate me, behind a stationary vehicle with the driver sitting on his foot brake just does my head in. Some modern cars have the rear indicator & all the other lights merging into one very bright flash.

Does any one else come across motorists turning off either left or right & only seem to indicate as they are actually at the very point of turning, all merging into the already extremely bright red mass of LED bulbs. In some cases you cannot make out the amber indicator light until the last minute or not all.

That's my morning rant over.... Apologies for the high jack.
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Old 27-01-2019   #22
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Smile Re: LED Headlight

Quote Originally Posted by AnteLo View Post
Thanks for recommending those blubs, my punto is also 2002 and it has H1 lightbulbs. Do they fit under headlights cover?
Yes, it's a matter of millimeters, but you can close the headlight covers.
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Old 27-01-2019   #23
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Quote Originally Posted by Lightning View Post
Yes, it's a matter of millimeters, but you can close the headlight covers.
What about light clip? How do you "lock them down"
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Old 27-01-2019   #24
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Smile Re: LED Headlight

Quote Originally Posted by AnteLo View Post
What about light clip? How do you "lock them down"
There is no problem because the bulbs are delivered with a plastic part that is fixed with the clip, then you insert the LED in the plastic part. It's fixed in a safe way because there are small nipples in the plastic part.
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Old 27-01-2019   #25
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Re: LED Headlight

Quote Originally Posted by Lightning View Post
Yes, it's a matter of millimeters, but you can close the headlight covers.
That will help the airflow from the fan - not.
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Old 27-01-2019   #26
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Talking Re: LED Headlight

Quote Originally Posted by g8rpi View Post
That will help the airflow from the fan - not.
The fact is the airflow is sufficient since I have checked the headlight covers temperature after an hour drive in city driving conditions...
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Old 27-01-2019   #27
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Re: LED Headlight

Quote Originally Posted by Lightning View Post
The fact is the airflow is sufficient since I have checked the headlight covers temperature after an hour drive in city driving conditions...
Another lack of understanding. It's the temperature of the LED chips that matters, not the headlight covers. Basic physics says for a given power dissipated inside the housing the average surface temperature of the housing will be the same regardless of the fans operation. The LED chips could be well over their maximum rated operating temperature due to poor fan airflow but you can't tell by measuring the lamp housing temperature. The design of the LED appears to suck air in at the rear and blow it out the circumference so flow will be restricted by a close cover near the inlet but this area will stay cool because the hot air outlet is not blowing on it.

Robert G8RPI.
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Old 27-01-2019   #28
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Talking Re: LED Headlight

Quote Originally Posted by g8rpi View Post
Another lack of understanding. It's the temperature of the LED chips that matters, not the headlight covers. Basic physics says for a given power dissipated inside the housing the average surface temperature of the housing will be the same regardless of the fans operation. The LED chips could be well over their maximum rated operating temperature due to poor fan airflow but you can't tell by measuring the lamp housing temperature. The design of the LED appears to suck air in at the rear and blow it out the circumference so flow will be restricted by a close cover near the inlet but this area will stay cool because the hot air outlet is not blowing on it.

Robert G8RPI.
You are wrong.
If the LED was too hot, the cover and the face of the headlight will show exceeding temperature.
This is not the case showing that there is no excessive heat.
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Old 27-01-2019   #29
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Re: LED Headlight

So how many semiconductor cooling systems have you designed?

The power dissipated in the light housing is constant and the LED "chip" is tiny compared to the housing. A typical Cree 15W COB LED has a maximum operating temperature of 150 deg C. and a thermal resistance of 1.7 C/W so the absolute maximum temperature of the mounting base is 125C. For 2 chips and an ambient of 20C the thermal resistance of the "stem" would have to be less than 3.5 C/W This is pretty low and a more realistic 50 deg under bonnet temperatur it would have to be 2.5 just to keep it below absolute max temperature. A 3C/W finned aluminum heatsink might be 100mm x 50mm with 15mm fins.The thermal resistance to the headlight outer case is much higher so it is impossible to infer the LED temperature from the outer case temperature. Ambient temperature will have a much larger effect than the LED chip temperature.
I would have thought a physics teacher would have a better grasp of basic thermal theory.


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