What is an LED?

Inside each LED is a small bit of chemicals. When electrons are passed through it, it emits light.
By changing this chemical compound, you can in effect change the wavelength emitted – infrared, red/green/blue (RGB), near ultraviolet, etc. By combining red, green and blue (RGB) LED’s you actually see a white light. Hence the method is called multi-colored white LEDs or RGB LEDs.

Another method to produce white light involves coating an LED of one color (usually blue) with phosphor of different colors to produce white light. The resultant LEDs are called phosphor-based white LEDs.

RGB LED	WHITE LED