The color temperature refers to how warm or cool a color is. Light warmth is measured in Kelvin. 2. The smaller the Kelvin degree, the more yellowish the shades, the larger the degree, the more bluish the shades. 3. Low color temperatures of 2700-3000K give warm lighting, intermediate temperatures of 4000-5000K give daylight, and high color temperatures of 5000-6500K give cool lighting.