Quote Originally Posted by Tiger
I don't see how light switches are affected... that is why we have relays in the LKM... Light switches are simply nearly no load circuit... merely signal the relay to rurn on or off.

You also must consider how old our cars are... E32 and E34 where we turn on and off headlights daily for at least 11 years or so. Don't you think 10+ years is a good reliability of a simple switch?
Switches like any electrical component are rated for a certain amperage or current rating. I am not familiar with the amperage that is required for HID lights or the rating of the switch but it is very possible to run too much current through a switch not rated for that current. I agree that switches wear out but it would need to be determined how the switch failed to know for sure. In other words, you could be right but who knows? Maybe someone can chime in on the switch rating and the current drawn by HID lights etc.