What is Kelvin

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The colour of light is expressed in Kelvin and in point of fact, we are talking about colour temperature.

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What tangible examples can be provided for this colour temperature? At a higher colour temperature, the light becomes a deeper blue (cooler), whereas the light becomes more yellow (warmer) at a lower colour temperature.

Please refer to some examples below.

Candle light 1200K
Sunrise 2000K
Sunrise after 1 hour 3500K
Day light 5000K
Mid-day sun 5700K
Neutral white light 6500K

The colour temperature has a great influence on the atmosphere in spaces. For example: warm light makes you quieter, whereas blue light increases your concentration.

Please refer to this overview of colour temperatures that Calex provides:

Flame 2200K
Extra warm white 2100-2500K
Warm white 2500-3000K
Cool white 4000K
Day light 6500K

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