I changed my bulbs to LED items, but the Stop/Tail fits in perpendicular to the others, and with a normal bulb this isn't an issue but with directional LED's it is. I modified the lamp so that it pointed towards the back of the car, but they just weren't bright enough, they were a better shade of red but only about half as bright. The indicators were even worse.
I changed back to normal bulbs, because I imagined that if someone were to rear end me, I might be liable because of the decreased output. Not worth it