Main problem with LED bulb substitutes in a taillight is that the LED is more of a "point source" of light, while a regular bulb throws out a lot of light in at least 180 degrees (half sphere).
LED's work well in most turn signals because the light is more "focused" and directional.
I have come to terms with the possibility of dying while riding, life has a 100% death rate. I would rather live having fun and end up dead in a motorcycle crash than never do anything fun because it's dangerous and I might get killed. No one makes it out alive anyway. - From a friend on another forum, used with his permission.