Running two bulbs I got off ebay ages ago - cant remember there specs, but they have a small single front facing led, then some even smaller ones around the edge.. not annoyingly bright - just perfect! And also utilizing a red LED Festoon bulb in the center with down firing LED's as well. Did this 2 years ago, and figured I might as well post it up and show you what I've got on it!
Gives the majority of the truck a nice ambient red glow, safe on the eyes - plenty of light to see when you need to.. when the dome light is switched over to passenger or driver its a nice soft color pointed directly where it needs to be, and doesnt bug the person not using it!
Sorry for the grainy image of the inside of the truck - had to bump the iso up to 400 and then dropped it to about a 1/4 frame rate to pick up how my own eyes see it.. :-)