The addition of neutral white LEDs results in a more continuous spectrum in which red, green and blue peaks can be managed to find a precise tint. Adding amber to the color mix creates a fourth peak in the spectrum, enabling a large range of warm white tints.
An obvious benefit of RGBW and RGBA fixtures is the possibility that they can change instantaneously from white light to any dynamic color, therefore increasing the number of potential scenarios in a lighting design.
In addition to the millions of saturated colors achievable with standard RGB lighting fixtures, RGBW fixtures provide an extended range of subtle pastel colors. While a single pastel color was a specific combination of red, green and blue channels in RGB, it can now be made by using the white channel at close to its maximum. It means that the flexibility to play with the three other channels is kept, allowing greater accuracy in creating a specific shade.
The channel of amber LEDs blends with the channels of red, green, and blue LEDs to produce a significantly expanded color palette thanks to a bigger range of colors. As a result, RGBA fixtures make it possible to create intense yellows and oranges.