How much voltage is required to glow an LED? - Quora
What is an LED? | All About LEDs | Adafruit Learning System
How Many Volts are Needed to Power an LED? - KitHub
Light-Emitting Diodes (LEDs) - learn.sparkfun.com
Do I Need an LED Driver? — 1000Bulbs.com Blog
Light Emitting Diode or the LED Tutorial
Basic Light Emitting Diode guide - DP
How Many Volts are Needed to Power an LED? - KitHub
How to use LED circuit in basic ways | ElecCircuit.com
How much voltage does a green LED need to be supplied? Will it handle 5V? - Electrical Engineering Stack Exchange
How Does a 5mm LED Work? - LEDSupply Blog
Why do you need a current limiting resistor to drive an LED if the LED draws only as much current as it requires? - Quora
How Does a 5mm LED Work? - LEDSupply Blog
Which Resistor Should I Use with my LED? – Kitronik Ltd
Light-Emitting Diodes (LEDs) - learn.sparkfun.com
Green led is very dim - General Electronics - Arduino Forum
LED circuit - Wikipedia
How do I calculate what resistors I need for RGB LEDs with 3.7V? - Electrical Engineering Stack Exchange
How Does a 5mm LED Work? - LEDSupply Blog
Light-Emitting Diodes (LEDs) - learn.sparkfun.com
Forward Voltage and KVL | All About LEDs | Adafruit Learning System
