The following are the different types of RGB LEDs:
R/G/B/W - Has an additional white LED. This is often used where you need a pure white as well other combined colors.
RGB / 3 in 1 LED - Uses a red, a blue and a green LED chip are mounted within a common light engine and focused through a lens to produce a more uniform hue across the beam of light.
RGBW / 4 in 1 LED - similar to the RGB LED but with a warm white LED integrated in the light engine to offer more color tones.
