![blue led](https://i0.wp.com/www.exploringarduino.com/wp-content/uploads/2013/06/blue-led.jpg?resize=350%2C278&ssl=1)
Image courtesy of SparkFun Electronics
An average 5mm Blue LED has a 3.4V forward voltage drop, and a forward current of 20-30mA. They are generally brighter than other LED colors. Don’t forget to use a current-limiting resistor when you connect an LED to your Arduino!