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LED Headlight
AllCity
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 3 Weeks Ago   #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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