BUT,
Note that these led only work in one direction!
Indeed, they have no diode bridge that allows work around this problem. As for me, I tinkered a led him to add a diode bridge as in the cockpit, opening a door, current flows in one direction. but if I turn the lamp manually through the switch, current flows in the other direction! So that means that whatever the direction of connecting the LED, it will light up if one opens a door OR via the switch. Most cars are made like that.