High Intensity Red Rotating 1157 Bulb

Do you have the entire part no. ? The 1157s I looked at are either 6V or 24V. You might have a 24V LED.
 
There is no stamp on the bulb and there is no mention of volts on the original packing.

The bulb works perfect when I start it up, then if I drive a couple of blocks it starts to fade.

I tapped this circuit from my modified undertail LED brake/tail lights as a third light. I'm actually using the original turn signal housing as the 3rd light. I attached it to my custom license plate frame and I thought the housing was grounded through circuit. I'm not sure if I had to add a resistor to the circuit or not.
 
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