(K)
A thermometric scale used to measure light temperature. 0 degrees K is absolute zero (a hypothetical temperature representing the complete absence of heat); water freezes at 273.15 degrees K, which is 0 degrees C or 32 degrees F. The most common use of Kelvin temperatures in the graphic arts is to describe lighting sources for viewing and analyzing color. The color of light sources is measured in Kelvin temperatures. A standard balanced light source (neutral in hue and with the brightness of midday sunlight) measures 5000K.