LED Colour Mixing Explained  LEDs have had a long association with colour, from the advent of visible spectrum red LEDs in the early 1960’s to the ground breaking development of the blue LED by Shuji Nakamura. As soon as blue LEDs became commercially available, lighting manufacturers like Pulsar started to experiment with colour mixing, creating a vast palette of colours from a few carefully chosen light sources. Fast forward to the present day, and LED colour mixing has become the standard for architectural and stage lighting. So why are LEDs so effective at colour mixing? Most light sources produce a broad spectrum of light which has to be filtered out to make specific colours, whereas LEDs are very efficient at making precise specific colours directly from the source. Adding these colours together rather than having to remove large portions of the light spectrum is far more energy efficient, controllable and convenient. Simply by changing the levels of each LED, a massive