Technical Info: Colour Temperature

The term used in general illumination is correlated colour temperature (CCT). CCT relates to the colour of light produced by a light source, and uses the Kelvin temperature scale. It describes the relative colour appearance of a white light source, indicating whether it appears more yellow/gold (“warm”) or more blue (“cool”), in terms of the range of available shades of white.

Colour temperature can affect the “feel” of a lit object and influence its perceived colour. Retailers choose their light sources, colour temperatures and CRI carefully as it can have an effect on what you perceive. The fruit fresher, the meat redder and the jewels have more sparkle. Colour temperature is one aspect of this practice and adds to the perceived warmth or coldness of the light.
Colour temperature tends to be a personal decision as people choose the temperature that makes them feel best. Some of the basic colours temperatures commonly found are outlined in the chart below

Knowledge Centre

The sections below may allow you to understand some basic lighting concepts and cover the basics in allowing you to select products. IES files are available on request.

Colour Temperatures
Rating Description Applications Light Source LED
2700K Warm,White Restaurants, Bars, Residential for cosy atmospheres Incandescent, HID Yes
3000K Warm,White Restaurants, Bars, Residential for cosy atmospheres Halogen, Fluorescent, HID Yes
4000K Neutral,or Natural White Retail, Residential, Office, Commercial, Workshop for clear feeling Fluorescent, HID Yes
5000K Neutral,or Natural White Retail, Office, Commercial, Workshop, Medical for cool feeling Fluorescent, HID Yes
6000K Cool,White or Daylight Retail, Office, Commercial, Workshop, Medical for cool feeling Fluorescent, HID Yes
This list is by no means definitive. There can be many variations and gradations of colour temperatures. It is to be used as a rough guide to possible selection of colour temperatures. Colour temperature can be a very personal choice and those decisions may vary according to the application, seasons and location.

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