22Ohm Resistor x 10
22Ohm 0.25w Carbon Resistors 1/4w Resistor 20R
These resistors have been chosen to work with our LEDs and our batteries.
In our experience the resistors are not strictly necessary but will slightly increase the already significant longevity of the LED.
The batteries are nominally 3v and the LEDs typically 3v to 3.6v