Kelvin (symbol: K) is the unit of thermodynamic temperature, one of the seven base units of the SI system. It is named after the British physicist William Thomson (1824–1907), known as Lord Kelvin.
Kelvin (K) is a unit used to measure temperature , but it is also used in lighting to indicate the color temperature of light sources. The Kelvin scale begins at absolute zero (0 K), the theoretical temperature at which all molecular motion ceases, and has no negative values.
In lighting, the Kelvin value indicates how "warm" or "cold" the light appears. The lower the Kelvin value, the warmer (yellowish) the light; the higher the Kelvin value, the colder (bluer) the light.
Color temperatures in Kelvin:
- Low Kelvin values (approximately 2700 K - 3000 K) : This light is warm, yellowish, and similar to incandescent light. It creates a cozy, intimate atmosphere.
- Neutral Kelvin values (approximately 3500 K - 4100 K) : This light is whiter and more similar to natural daylight. It is suitable for workspaces and living rooms.
- Higher Kelvin values (approximately 5000 K - 6500 K) : This light is cool, bluish, and resembles daylight. It is often used in environments where bright, energetic light is needed, such as offices or workspaces.
Summary:
Kelvin (K) helps describe the color of light, from warm and yellow (low K) to cool and blue (high K). It allows you to create the right atmosphere or working conditions with lighting.