Color temperature of lighting terms

Color Temperature: When the color of light emitted by a light source is the same as the color of light emitted by a black body at a certain temperature, the temperature of the black body is referred to as the color temperature of the light source. Because most of the light emitted by the light source is commonly known as white light, the color table temperature or correlated color temperature of the light source is used to refer to the degree of its light color relative to white to quantify the light color performance of the light source. According to Max Planck's theory, heating a standard blackbody with complete absorption and radioactivity, the temperature gradually increases as the luminosity increases; the black body locus on the CIE chromatic coordinates shows the blackbody from red-orange-yellow - Yellow white - white - blue and white process. The temperature at which the black body is heated to the same or close to the light color as the light source is defined as the correlated color temperature of the light source, and the color temperature is expressed in absolute K (Kelvin, or Kelvin) units (K=°C+273.15). ). Therefore, when the blackbody is heated to red, the temperature is about 527 degrees Celsius or 800K, and other temperatures affect light color changes. The more bluish light color, the higher the color temperature; the lower the color temperature, the more reddish it is. The light color of the day changes with time: 40 minutes after sunrise, the light color is yellow, the color temperature is 3,000K, the snow is white at noon, it rises to 4,800-5,800K, and it is about 6,500K at noon on cloudy days. The light color was red before sunset and the color temperature dropped to 2,200K. The relative color temperature of other light sources. Since the correlative color temperature is in fact a black body radiation close to the light source light color, the evaluation value of the light source light color performance is not an accurate color contrast, so the two light sources with the same color temperature value may still have a light color appearance. There are some differences. Only Feng Shuangwen can not understand the color rendering ability of the light source on the object, or how the object color is reproduced under the light source. Light source color temperature is different, light color is also different, color temperature below 3300K has a stable atmosphere, warm feeling; color temperature in the 3000 - 5000K as the middle color temperature, there is a refreshing feeling; color temperature above 5000K has a cold feeling.