Getting small LED's and powering them is no problem. The problem is where to jam the battery, circuit board to control the lights, and some kind of switch, in a Crown Vic. I could strip the whole interior and paint the windows black to get the room but that looks kind of tacky. With the new, small light bars, like the one on the Charger, the only way to do them realistically is with fiber optics, which takes up even more room and batteries, since you'd need at least one red and one blue LED. It sure would be a lot easier in 1:43 scale or if I was modeling an earlier era, where one Federal Beacon Ray on the roof is all I'd need. I've seen some really amazing lighting effects from guys who are building 1:25 scale models.