Ever wonder why “color temperature” is called that?
A meter is defined by how far light travels in a vacuum in 1/299,792,458th of a second. A second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of Cesium 133. So, it should come as no surprise that the color composition of light is measured by comparing it to something. That something happens to be the light radiated by a theoretical black body when heated.
And there’s more information where that came from.
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