Pulsar Knowledge - Colour Temperature Series Pt. 1   What is Colour Temperature?   Colour temperature is a way to measure the colour of the colour of white light. But wait, isn’t white light just one colour? The short answer is no. In the 17th century, Isaac Newton showed that white light is a combination of many different colours. Later, Max Planck, another physicist, showed that the exact mix of those different colours is determined by temperature. White light comes in many different shades, from the warm glow of a fire or tungsten bulb to the cool clarity associated with daylight, or a laboratory. Here, temperature refers to how hot you’d have to heat up a material (this could be a filament) to create that specific colour of white light. Lower colour temperatures tend to be closer to amber, and higher colour temperatures become bluer. Why do we consider these colours to be white, rather than amber and blue? This is simply because these light sources still