The LED's arrived for the Mustang and I tested them with a 9v battery and they lit up really well. I installed one to see the effects I was highly impressed. The only down side was the adhesive did not stick well enough, so I'm going to have to strap it down.
I liked the lights so much I bought 3 more packs. I am going to light the inside of the trunk so when you pop the lid it will light up all around seal and show off the sound system.
I also picked up some white lights to help highlight the rear seat but haven't decided what exactly to do yet .