Some early morning and evening light (golden hours) has a lower color temperature due to increased low wavelength light scattering by the Tyndall effect. The blue color of the sky is caused by Rayleigh scattering of the sunlight from the atmosphere, which tends to scatter blue light more than red light. The changing color of the Sun over the course of the day is mainly a result of scattering of light and is not due to changes in blackbody radiation. The color temperature of sunlight above the atmosphere is about 5900 K.Īs the Sun crosses the sky, it may appear to be red, orange, yellow or white depending on its position. The effective temperature, defined by the total radiative power per square unit, is about 5780 K. The Sun closely approximates a black-body radiator. The below table is a helpful reference for knowing the color of your typical light source. Warm in this context refers to radiated heat flux rather than temperature the spectral peak of warm-coloured light is closer to infra-red and most natural warm-coloured light sources emit significant infra-red radiation. The CIE 1931 x,y chromaticity space, also showing the chromaticities of black-body light sources of various temperatures (Planckian locus), and lines of constant correlated color temperature.Ĭolor temperatures over 5000 K are called cool colors (bluish white), while lower color temperatures (2700–3000 K) are called warm colors (yellowish white through red).
In practice, color temperature is meaningful only for light sources that do in fact correspond somewhat closely to the radiation of some black body, i.e., those on a line from reddish/orange via yellow and more or less white to blueish white it does not make sense to speak of the color temperature of, e.g., a green or a purple light.Ĭolor temperature is conventionally expressed in kelvins, using the symbol K, a unit of measure for absolute temperature. The color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of comparable color to that of the light source.Ĭolor temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, manufacturing, astrophysics, horticulture, and other fields. Color Temperature(Kelvin) For LED Strip Lights
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