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                                         Basic knowledge

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luminous flux

ΦLmThe sum of light emitted per second, simply speaking is the amount of light
Luminous intensityICdThe intensity of light which means the amount of radiation in a particular direction angle.
IlluminanceELm/m2The amount of incident light by per unit area
Color temperature(CCT)KKWhen the color of the light emitted from light source is the same with the "blackdody" radiation color at a certain temperature,the higher temperature of the "black"is,the more blue and less red in the spectrum.For example,incandescent light color is warm white,CCT is 2700K, but CCT of the daylight  fluorescent will be 6000K

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