1157 LED Lamps

BobW said

You just need to replace the flasher with an electronic one for LED's. Note: If the flasher doesn't work when you first plug it in you need to reverse the wires in the plug. LED bulbs and flashers are polarity sensitive.

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that's true about the polarity. I had to flip around 2 of mine to get them to work. Mine don't have fans, probably because they are just brake lights not headlights. They do have a metal heat sink built into them. The ones I was really impressed with were the #921 LED's I put into the backup lights. WAY brighter, whiter lights which my old eyes appreciate when backing up at night.