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oem led's use a pad of led's and use a projector or reflector to output the light onto the road. the control unit controls the level and also any left or right shifting of the light.
what i noticed with the oem LED headlights:
- light output is consistant. there are no shadows, shades, bright spots, that you would normally see even with a HID xenon headlamp.
- they tend to light the road up right in front of you better, farther away for distance wise, you need that oem control unit to control the level. eg. MB system adjusts the level further if it detects no on coming traffic (so you dont blind them). there is a second system for automatic highbeams as well
So thus, if you are doing a retrofit from halogens to LED, the projector will help (if your doing a full retrofit), but you do need the otherside of the system, the auto leveling part, to make full use of them.
The super high end oem LED systems have a 2ndary control unit, using sensors and cameras and such, to cut out part of the LED pad to prevent glaring of on coming traffic. pretty cool system. basically can use the cameras to track the oncoming traffic as it moves, and cuts out that part of the pattern while keeping the rest lit up. you can think of it as censoring off.
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