so many different kinds. ex. Flat square top, bullet type (round) and all of these direct the light differently I had light distribution issues where it was dark in some area and bright in others. Not only that, but the LED's went out completely after some time and aren't LED's suppost to last practically forever.. LOL Anyways, after spending $125 or so for my NRauto's, another 30 in LED's I got fed up with it.