Each board has an LED and an 820-Ohm resistor in series to protect the LED from over-currents. The color of the board reflects the color of the LED for quick identification. An LED symbol is printed on the front and back to identify the orientation of the LED. You will get two blue LEDs and two white LEDs.
We are providing these merely for convenience. Regular LEDs with leads can be used with miniTesla without any alterations. However, these LED boards allow a more compact and neater build when LEDs are needed.
