Tail lights failing can be a dangerous thing in many situations. It can get you pulled over or worse, it can get you into an accident. Newer cars are fitted with LED lights throughout but older cars didn’t have this technology. Retrofitting LEDs into older cars can be a safety precaution that costs next to the same price as new halogen bulbs.
I am putting LEDs into my 1985 Volvo 240’s tail light and am going to compare brightness and longevity compared to the halogen lights. This process could be repeated on any car and would look and function in a nearly identical fashion. This service could be marketed for any car that is fitted with old or deteriorating halogen systems.