Don't go the tinting route, a lot of people have problems with it bubbling up from the heat of the lamps......while some don't (i assume they didn't drive the car for 4 days after tinting it)
The best course of action that all my friends use is called VHT Nightshades spray paint.
you can use maybe 2 coats of the paint, and then 1 coat of clear coat when you are finished......... you can put more coats of the paint on, but be advised, the more you put on the darker it gets and the harder for the light to come out of.... my friend put 5 coats on his taillights and the clear coat and in the daytime you can hardly see him braking....
Also be sure to remove the housings when you do it, so you don't spray up your car (shady)