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Do you know the difference between D65, CWF, TL84, U30, HOR?

Date:Dec 21, 2020

Common light sources in the printing and dyeing industry


Description of common light sources: D65, A, C, D50, D55, D75, F1, F2, F3 are often used in color measurement and color matching software at home and abroad.


CWF, WWF, TL84, U30, HOR are commercial light sources frequently used internationally.


When the relative spectral power distribution curves of some light sources are close to specific illuminators, these illuminators can be used to describe some typical important light sources. For example, use D65 for average daylight, A for tungsten lamp, F2 for CWF, and F11 for TL84.


See the table below for details:

Light source namebrief introduction
A(Incandescent)A typical tungsten halogen lamp (incandescent lamp), with a color temperature of 2856K. The main light source used in homes or shopping malls is a typical incandescent lamp for metamerism testing.
C(Sunlight)Filter tungsten halogen lamp, color temperature 6770K. The early average fluorescent lamp, but its relative spectral power distribution in the near-ultraviolet region does not conform to the average daylight, and has been gradually replaced by D65.
D65(Daylight-Neutral)The simulated average northern sky daylight is a set of relative spectral power distribution data summed up based on a large amount of data from the spectral radiance measurement of daylight at different locations on the earth. The color temperature is 6500K, which approximates the average natural daylight. It is the average relative spectral power distribution of sunlight anywhere from 2h after sunrise to 2h before sunset, and from cloudy to clear sky.
D50(Daylight-Red Shade)Color temperature 5000K
D55(Daylight-Warmer)Color temperature 5500K
D75(Daylight-Blue Shade)Color temperature 7500K
F1—F12(fluorescence)Compared with daylight and tungsten filament lamps, 12 different types of fluorescent lamps, due to the addition of fluorescent materials, will exhibit band-shaped radiation at certain wavelengths, which is a discontinuous spectrum.
CWF(Cool white fluorescence)American commercial fluorescent lamp, color temperature 4150K, typical American store and office lamp, typical fluorescent lamp for metamerism test.
WWF(Warm white fluorescence)American commercial fluorescent lamp, color temperature 3000K, typical American shopping mall and office lamp, typical fluorescent lamp for metamerism test.
TL84(TL84 fluorescence)European commercial fluorescent lamps, color temperature 4100K, rare earth commercial fluorescent lamps, used in shopping malls and office lighting in Europe and the Pacific surrounding areas, equivalent to American commercial fluorescent lamps U41.
U30(Ultralume 3000 fluorescence)American commercial fluorescent lamp, color temperature 3000K, rare earth commercial fluorescent lamp, used for shopping mall lighting, equivalent to European commercial fluorescent lamp TL83.
HOR(Horizon)Tungsten halogen lamp (incandescent lamp), with a color temperature of 2300K, which simulates the sunlight rising in the morning and sunset in the afternoon. It is the same light source used in homes or shopping malls as A. Lamps for metamerism testing, commonly known as twilight fluorescent lamps.

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