Those LED "conversion" bulbs are cool because they turn on and off so fast, like they do on newer big rigs and buses around the town. LED's operate in that "window" of wattage...bla bla bla...thats why i like them...

i tried a set of them in my rear turn signals, but they only shine light in one direction, meaning they wont reflect inside your bulb housing, which means they cant be seen very well....

there was a post about it somewhere, but i forgot...hope i helped