interior bulb size
 

I am thinking about having all my car interior map lights, dome lights, step courtesy lights changed to Xenon White LEDs.

I have checked the Osram Guide but still a little bit confused about the bulb sizes I need. Can someone who has did this help me out, thanks a bunch!

You'll need to make sure the power source of your car has enuff power to run all those heavy duty bulbs. :)