I use Ikea under counter lighting.
No. Really.
Slightly warm LED bars. Four of them from one hub. They happen to be 12v, and they are wired into the stock dome light switch. They pull about .3 amps. I put two up front, behind/over the driver and passenger. Then two in the back, up on the side molding against the roof, so they reflect off the roof. The whole thing gives off a nice diffused light that fills the whole cabin. I might put a small LED over the top of the rear cargo door, but otherwise, I'm done.