Recently I have changed all of my stock incandescent exterior and interior lighting to LED. I kept halogen headlights though. If you want to see a comparison of what it looks like before and after you can watch a video i made here: I am pleased with the result as it modernizes my 2005 F350 truck a bit more. If you're interested in seeing how i did it, i also did a HOW TO video here:
What do you think?