The catalog writeup said that you needed to use their flasher too. Maybe this install didn't use the new flasher causing it to blink fast?
That makes sense. I wonder if the "tall and skinny" of the actual light adds to the effect?
I had a quick look on their website when I purchased. It mentioned needing the flasher if you have both front and rear led's. I have normal globes up front at the moment but purchased the flasher just in case and to save on shipping.
I will post back once I install them to let everyone know if you do need the flasher with only rears. I'm sure I read someplace (perhaps a review) that the rears were installed without flasher and worked correctly.
This is for the non sequential.