What is the meaning of the brightness unit K in LED strip lights?

In the purchase of LED strip often see a parameter, is how much K, common 2000K-6000K, as a white, of course, can not understand what this K represents the meaning.

Today is the state photoelectric to answer your doubts.

"K" actually represents the color temperature

Color temperature is a physical quantity used in lighting optics to define the color of the light source. That is, a black body heated to a temperature, the color of the light emitted and a light source emits the same color, the temperature of the black body heated called the color temperature of the light source, referred to as color temperature. Its unit is expressed in "K" (Kelvin temperature units).

Color temperature (colo(u)r temperature) is visible light in photography, video, publishing and other fields with important applications of characteristics. The color temperature of a light source is determined by comparing its color with a theoretical thermal blackbody radiator. The Kelvin temperature when the thermal blackbody emitter matches the color of the light source is the color temperature of that light source, which is directly related to Planck's blackbody radiation law.

LED strip light color temperature 4000K is cold white. According to China's "national standard for lighting": 2700-4000K belongs to warm white. 4000-5700k belongs to white. 6000-7000k belongs to white. 8000k belongs to cold white. The color temperature of the lights in large shopping malls and hotels is basically about 4000K. 4000 official is generally called cold white, household 4000-5000 (neutral white) are good.

Add: color temperature is a unit of measurement that indicates the color components contained in the light. Theoretically, the color temperature refers to the absolute black body from the absolute zero degree (a 273 ℃) after the start of heating the color. Black body in the heat. Gradually from black to red, turn yellow, white, and finally issued a blue light.

Usually the human eye to see the light of the lamp, is composed of a spectrum of seven colors of light. But some of the light is blue, some are red, color temperature is specifically used to measure and calculate the color composition of the light method.