LED's draw far less wattage than the original 1157 bulbs. In many cars that will cause the flasher to "hyper flash", meaning flash at a rate that is two to three times normal. In cases such as this it is possible to install a ballast inline with the LED bulb that will draw more juice and cause the flasher to flash at its normal rate. Then again, LED automotive lights have come a long way from their first introduction. Some have a built in ballast. In some applications the flasher unit can be changed to correct the hyper flashing. You need to ask some questions before you buy to be sure they won't create an issue for you.
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