LEDs or hids Headlights
Link
http://www.vleds.com/new-products/h7-cxa.html
I'm not too familiar though and don't want my car to be the test subject, but I'm curious too. Post updates if you give it a try.
http://item.mobileweb.ebay.com/viewi...d=321118359394




I'm not too familiar though and don't want my car to be the test subject, but I'm curious too. Post updates if you give it a try.
LEDs generate much less heat than Halogen or HID bulbs. The reason they need the fan is because the heat they do generate in concentrated in the element and even moderate heating causes long term degradation.
So the heatsink and fan are to save the LED elements. Your reflectors are safe.
Last edited by beejAMG; Jan 31, 2014 at 06:40 PM.




LEDs should last a long time, as long as they don't get hot (and unfortunately "HOT" is must over 150 Deg C at the element.
The elements used to dope the semiconductor migrate faster as the heat goes up. As they migrate the PN junction becomes more diffuse and the efficiency of the LED goes down.
Trending Topics
The Best of Mercedes & AMG




I really don't know. You would have to compare the total efficiency of the HID vs. LED set up.
My guess is the LED would be brighter, and 35W of HID is a better than 55W of Halogen and 15W of LED is about 55W of halogen (If I remember correctly)
Of course each set up may or may not reach typical efficiency for its technology.




How so?
LEDs don't need ballasts at all. They use constant current sourest since the element uses less than 12V whereas HIDs need high voltage and hence the ballasts (always AC, because DC does not go through transformers) to take the 12V up to the several thousand needed to fire the bulb.
For the record I would definitely go for LEDs over HIDs if it was possible, especially with parts from DDM Tuning it's been a pain in the *** to get it working correctly and I sort of regret spending so much money on a pretty unreliable setup. Finally got it corrected by soldering in a capacitor between each power input and ballast, but it's been hell and still flickers a little bit.
Last edited by AMGAffalterbach; Feb 1, 2014 at 11:13 PM.




The car expects to see the relatively constant draw of a incandescent bulb, but instead sees the draw of the electronic ballast with its high starting current and then lower operating current. It assumes something is wrong.
The usual fix is a resistor across the line to "use" (waste) enough extra power that the total looks constant enough to keep the car happy.
No more yellow old school lights. The whole expressway it bright white now. Really happy with then. Def recommend them to anyone. Here are some pics







Sorry.
Most of the CAN BUS fixes I have seen just use a resistor. As long as the HID system draws enough power on the average to keep the system happy, the capacitor is a good solution.
LEDs don't need ballasts at all. They use constant current sourest since the element uses less than 12V whereas HIDs need high voltage and hence the ballasts (always AC, because DC does not go through transformers) to take the 12V up to the several thousand needed to fire the bulb.
Thanks for this. for less than a hundred bucks i MIGHT go and try the LED. if i dont like it, i can always put the HID set up back.
also, you mentioned that LED's dont need ballasst but when Im looking at the link the OP pasted, it looks like they have ballasts as well. Im not really familiar with the LEd so most likely im wrong but can you pls confirm? cheers mate!




also, you mentioned that LED's dont need ballasst but when Im looking at the link the OP pasted, it looks like they have ballasts as well. Im not really familiar with the LEd so most likely im wrong but can you pls confirm? cheers mate!
LEDs require a constant current. most cheep display LEDs running off 12V just have a resistor, but since with high currents the current changes quite a lot with small voltage changes and brightness follows current, an electronic circuit is used to set an specific current across a relatively wide voltage range.
To most these will look like "ballasts" used in gas discharge (HID) lights even though they are doing a very different job.




So a 55W ballast with 35W bulbs will still run at 55W but your bulb life will probably be shortened.
Some ballasts may be able to sense the bulb and adjust actual power to match, with eth rating being the maximum.
Anyone know more about the actual operation of automotive HIDs?
No more yellow old school lights. The whole expressway it bright white now. Really happy with then. Def recommend them to anyone. Here are some pics
Attachment 277872
Attachment 277875
Attachment 277873
Attachment 277874
I could have installed a 55w but I did alittle research and the get pretty hot and some times melt or damage the clear plastic head lamps.
I'm very happy with the 35w. Lights up my whole block.


