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The color temperature scale describes only the color of light emitted by a light source, which may actually be at a different (and often much lower) temperature. [1] [2] Color temperature has applications in lighting, [3] photography, [4] videography, [5] publishing, [6] manufacturing, [7] astrophysics, [8] and other fields.
Priest proposed to use "the scale of temperature as a scale for arranging the chromaticities of the several illuminants in a serial order". Over the next few years, Judd published three more significant papers: The first verified the findings of Priest, [7] Davis, [8] and Judd, [9] with a paper on sensitivity to change in color temperature. [11]
The range of isothermal color temperatures for both diagrams is from 1000 K (1000 MK −1) to 10 000 K (100 MK −1). Contracted from the term micro reciprocal degree , the mired ( / ˈ m aɪ r ɛ d / [ 1 ] ) is a unit of measurement used to express color temperature .
This presented a continuous range of color temperatures to choose a reference from. Any chromaticity difference between the source and reference illuminants were to be abridged with a von Kries-type chromatic adaptation transform. There are two extent versions of CRI: the more commonly used R a of CIE (1995) (actually from 1974) and R96 a of ...
The mired value associated with a given color temperature is computed as the reciprocal of the color temperature, in Kelvin, multiplied by : M = 10 6 T {\displaystyle M={\frac {{10}^{6}}{T}}} The shift is the difference in the mired values of the film and light source.
The text on retail LED lamp packaging may show the light output in lumens, the power consumption in watts, the color temperature in kelvins or a color description such as "warm white", "cool white" or "daylight", the operating temperature range, whether the lamp is dimmer compatible, whether the lamp is suitable for humid/damp/wet conditions ...
Incandescent light bulbs have a color temperature around 2700 to 3000 kelvin; daylight is around 6400 kelvin. Lower color temperature lamps have relatively more energy in the yellow and red part of the visible spectrum, while high color temperatures correspond to lamps with more of a blue-white appearance.
Color temperatures and example sources Temperature Source 1700 K Match flame, low pressure sodium lamps (LPS/SOX) 1850 K Candle flame, sunset/sunrise: 2400 K Standard incandescent lamps: 2550 K Soft white incandescent lamps 2700 K "Soft white" compact fluorescent and LED lamps 3000 K Warm white compact fluorescent and LED lamps 3200 K
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