Colour Temperature

Colour Temperature

You know when you look at different lamps and find they have a distinctively cool blue colour or a warm yellow colour? We call this the light's colour temperature (CCT), and the CCT rating for a light is expressed as a temperature in Kelvin (K). Warm candle light is about 1,900K and a brilliantly lit blue sky is 10,000K.

Open an Aurora Lighting catalog or browse lamps online and you'll see a "colour" specification, generally ranging from warm (2700K) to neutral (4000K). You might even find some products available in cool (6400K).

Let's pause for a moment to answer a quick question: Why is light colour expressed as a temperature?

Think about the heating of a metal object. At a high enough temperature, the object will begin to glow. You'd notice red first. Then, as the temperature gradually increased, the glow would change from red to orange, yellow, green, and blue.

Take a look at that brilliantly colourful graph here, which is called a colour space chromaticity diagram. Notice the chromaticity tolerances specified in the middle, defined by the quadrangles along the upward arching line. Also note the values: from 10,000 on the left to 1,500 on the right.

The quadrangles of this curve result in quadrants of colour, which leads us directly into the topic of binning and sub-binning.

Watch our Light Byte on CTA Dimming

Colour Xchange Technology

Aurora Lighting's CX products allow you to adjust the colour temperature of white light independently of, or in conjunction with, the brightness.

Learn more

Colour temperature in lighting relates to the perceived colour of the light source, expressed in Kelvin (K) and ranging from warm white (2700K) to neutral white (4000K) to cool white (6400K).


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