Light Bulb Color Temperature - WHAT ARE KELVINS? 2700K, 3000K, 5000K

The Kelvin is a unit of measure in lighting, but it goes much further than that. Where Fahrenheit and Celsius deal with thermal heat in relation to the boiling point and freezing point of water, the Kelvin scale deals with the freezing point of all matter. You don’t say “0 degrees Kelvin,” instead you say 0 Kelvin. 0 Kelvin deals with the absolute point in which all matter stops moving. With no movement of matter there is no way to generate heat, so while that is not realistically possible to measure, it is possible to conceptualize.

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The man who came up with the Kelvin scale, physicist William Thomson, was the first person to make a correlation between heat and color. He heated metal, and noticed that at certain temperatures, the metal emitted a certain color. The lower the temperature, the more red the color - and the warmer the temperature the more blue the color.

KELVIN IN LIGHTING

In lighting, the Kelvin scale tells us at what color emission will occur in any light source. On the low end of the scale you have 1,000-2,000 Kelvin. This is comparable to a match being lit, or the color of metal when it is first heated up to a glow - a reddish orange. When you move up the scale the 3,000-4,000 Kelvin range is more of a yellow hue. Then moving up to around 5,000-6,000 scale you get to the “white-hot” zone. Above that, from 7,000-10,000 Kelvin, light appears more blue.

Most lamps/bulbs you buy from a store, nowadays, will have a Kelvin color rating on them identifying what color spectrum you can expect from them. Just keep in mind that the lower the Kelvin number, the more red the color will be. Conversely the higher the Kelvin rating, the more blue the color.

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#lighting #kelvin #electrical
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