I'm curious about the LED DRL/Fog conversions out there. The thing I don't understand is, if I already have non-LED parking/fog lights, why do I need all that wiring and control module? Why can't the LED housing be swap in place of the stock ones, using the stock wiring? I mean, LED's use less power. So, having a ballast doesn't seem necessary, and since the wiring is already in place to control when each type of light is turned on, I don't understand the need for a separate control module. Examples of the kits I'm talking about are....


http://www.outmotoring.com/mini-halo...light-kit.html

http://www.outmotoring.com/led-front...light-kit.html

 

The "ballast" control module drives the LEDs and the DRLs. Without it, you would burn out the LEDs from over voltage or over current. It's just the nature of LEDs. The control box also talks with the footwell module to trick the bulb out errors.

You could just replace your fog bulbs with plug-n-play LEDs, but you won't get the same output from them.