What you need more than anything else is the eclipse effect of a dark shape over the light source center. The afterburner effect is like a solar eclipse. A black round or tail light lens shape in front of the bulb would probably be pretty close to the concept car effect. It's indirect lighting showing around the dark center. Whether that would be legal or not is another issue. It might not be bright enough.
Or the other more important issue is it might be so good looking that drivers would be distracted by looking at the "cool effect" and slam into the back of you (or somebody in the lane next to you) because they forgot they were looking at brake lights instead of special effects. I'd be more concerned over that actually than anything else.
Blue Angel is here!!
1SS/RS LS3 M6 IBM