The interior lamp uses white LEDs (Light Emitting Diodes. These solid state devices will never burn out,

This is the circuit board with the LEDs and two constant current power supply regulators.

Here is the circuit board mounted in the lamp base I got from Classic Industries in Garden Grove CA.
Power on smoke test.

 

There was no fire or smoke - that's a good thing.

Installed in the car.

Now I can proceed with the headliner project.

Pretty cool - eh?