I think I can help you here!
I used a liquid tint on my rear tail lights & then clear coated them. The cops can't touch me either since it'* not covers (which are illegal in my little part of this world).
I thought when I bought this car that the tail lights were too bright & distracted your view of the car as a whole. You kept wanting to focus on the tail lights not the car itself. My lights are now 5 shades darker than stock, even darker than the GTP'*. Check it out for your self:
About half way down this page. AND YES that'* what I really look like!