![green led](https://i0.wp.com/www.exploringarduino.com/wp-content/uploads/2013/06/green-led.jpg?resize=350%2C214&ssl=1)
Image courtesy of SparkFun Electronics
An average 5mm Green LED has a 2V forward voltage drop, and a forward current of 20mA. Don’t forget to use a current-limiting resistor when you connect an LED to your Arduino!
Buy green LEDs from Amazon, SparkFun, Adafruit, or Newark.