led bulbs blowing fuses

can anyone tell me why a 3157 led tail light bulb blew my fuse when i tried to use my blinker ? is there a module or something i have to use, or are they not dual filament(sp?). i have clear lenses on my car and i like the way they look, just not the red bulb. too many people ask me why i have euros and its starting to make me mad.