Originally Posted by ShaunJ
Unsure of what the bump on this thread was for... but! with the Jeep WK you are going to want to use a relay harness with a capacitor. All because of the PWM headlight system.
Although I also must say I highly recommend using the type of bulb the housing was designed for. You will glare other drivers (regardless whether they flash or not. Most don't flash because people with PnP HID's never seem to care about others).
The 08+ OEM HID headlights can be made to fit on the 05-07's. There is little to buy. You will need to find something to cover the gap.
I would point you toward a projector retrofit. This will project the light where it needs to go and how it needs to go. They can be done for a rather low cost if you do a budget build.
If a projector retrofit is something that you don't have the time/money/energy to do I would recommend a HIR conversion. Following the below picture (Trimming of the base can be done with a file or nail clippers):
Here are some facts about the HIR conversion. All of this extra light with no glare!
9005 -> 9011
9005: 1,860lm +- 12 %
9011: 2,500lm +- 15 %
Potential max increase of 75.6% more lumens
Best bulb: regular Philip
9006 -> 9012
9006: 1,095lm +- 15 %
9012: 1,875lm +- 15 %
Potential max increase of 131.7% more lumens
Best bulb: Volstra +30 HIR2
For a fog light you definitely DO NOT want HIDs (or LED pods). They act exactly how a fog pattern shouldn't by scattering light. If you are looking for a nice alternative to fog lights maybe take a look at my build using Morimoto LED assemblies here (Tutorial can also be used for JW Speaker assemblies):
How-to: Morimoto LED Fog Lights on a WK
I will gladly answer any questions if people have them. I may or may not see them if it's posted here but certainly a PM will be seen quickly.
I can provide some tips and tricks or maybe a list of parts you would need to complete one of the options above. Hopefully this post was helpful in some way and someone will choose NOT to put HID's in a halogen reflector (headlight or fog light).