Originally Posted by ElectroBoy

There are resistors built into these bulbs so they look like incandescents to the dumb flasher and there’s no hyperflash. LASFIT erroneously calls them “Canbus”. Since these bulbs are driven so hard to get them so bright they will get hot with extended use, like 10 minutes or so on a hot summer day. There’s also some type of built-in thermal switch that opens up to protect the resistors in this case (they are physically small and can only dissipate so much heat even with aluminum heat sinking). When that happens you will hyperflash but when turning off the blinkers for a short time, maybe 30 seconds, the switch resets and all is well. I’ve had mine over a year and the only time I could get them to hyperflash was by leaving the emergency flashers on for about 20 minutes.