i would like more information about a resistor that has come with the LED bulbs.

the LED's are red and they flash.
the colours of the resistor blue body with 5 colour bands on it, it either goes ( Closes to the LED ) green-red-black-black-red or green-brown-black-black-brown.

we know that the LED's are for 12v but we would like to know more about this resistor as we have looked online and cant find it anywhere.

 

If the LEDs flash when you apply power, then there is more than a simple resistor in the circuit. If there are only 2 pins then it might be some sort of bimetalic strip that heats up and disconnects. When it cools down it reconnects. Way old school...

What are you trying to do?

 

they came already like this......we are going to be putting them on a f1 slot car. and trying to work out if the voltage will be right.

 

That picture does little to help understand. Where did you buy them? What voltage were they spec'd for? I think it's safe to assume that they will only work for the spec'd voltage but you can test them on other voltages to see if they work.

 

The resistor, from the colours is 510Ω. With a standard LED and a 12V supply that would result in an LED current of about 20mA which is reasonable. The flashing circuit is built into the LED.

 

But a flashing LED is NOT a standard LED.

 

But a flashing LED is NOT a standard LED.

Clearly true, but nobody said they were standard LEDs.
The TS says they were specified for 12V and a resistor value of 510Ω is consistent with that.

 

510R will produce between 10mA and 15mA. The voltage across the flashing LED will be about 3.3v to 3.9v

High Bright Flashing LEDs will produce very good brightness at this current.