I have to disagree with people saying LED's are bad. I've made my own LED sidemarkers, my brake lights are LED stock, and I just got done fabricating my own LED turn signals
Sequential LED Rear Turn Signal - G35Driver
But I am using high current (70mA) LED's on all of mine, not the kind you buy from superbrightleds.com or vleds.com. My turn signals are at least as bright as stock. In that link I have a video comparing the two.