What is CCT or Kelvin in Lights?

CCT, or Correlated Color Temperature, serves as an indicator used to categorize the color of a light source. It represents the color of visible light emitted by the source. As objects heat up, they emit light, and their colors change based on temperature, from orange and yellow to blue. Color temperature is measured in Kelvin (K) and reflects the heat of a black object, providing a color tone similar to the light source.

Kelvin, an international temperature unit like Celsius, considers absolute zero as -273.15 °C. Conversion from Celsius to Kelvin is achieved through the formula [K] = [°C] + 273.15. Color temperature is expressed in Kelvin, denoted by the symbol K, and is commonly used in the lighting sector, photography, and publishing.

In lighting, color temperature categorizes shades of white, where lower Kelvin values result in warmer, more orange tones, while higher values yield cooler, bluer hues. Common color temperatures range from 1000 K to 12,000 K. Warm white (2700 K – 3500 K) is suitable for spaces like living rooms, bedrooms, and restaurants, while cold white (4500 K – 6500 K) is preferred in offices, work areas, and learning spaces.

Different color temperatures offer various advantages. Warm white lightings create a relaxing atmosphere, while cold white lightings contribute to increased concentration. The choice of color temperature depends on the specific usage area and its purpose.

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