The colour of light is measured in Kelvin (K). In fact, we are talking about the colour temperature of a lamp.
How does colour temperature work?
At a high colour temperature, the light appears bluer and cooler, while at a low colour temperature, the light appears yellower and warmer.
Some tangible examples:
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Candlelight: 1200 K
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Sunrise: 2000 K
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Sunrise after 1 hour: 3500 K
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Daylight: 5000 K
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Midday sun: 5700 K
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Neutral white light: 6500 K
Colour temperature has a significant impact on the atmosphere of a room. Warm light is relaxing, while blue light can increase concentration.
Overview of our colour temperatures:
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Flame: 2200 K
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Extra warm white: 2100–2500 K
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Warm white: 2500–3000 K
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Cool white: 4000 K
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Daylight: 6500 K