The following table shows the correlated colour temperature of common light sources: Color Temperature Light Source 1000-2000 K Candlelight 2500-3500 K Tungsten Bulb (household variety) 3000-4000 K Sunrise/Sunset (clear sky) 4000-5000 K Fluorescent Lamps 5000-5500 K Electronic Flash 5000-6500 K Daylight with Clear Sky (sun overhead) 6500-8000 K Moderately Overcast Sky 9000-10000 K    Shade or Heavily Overcast Sky    Here is a visual representation of the Kelvin temperature scale. Notice how lower temperatures are very warm, and following the color spectrum, increase in numeric value as they become cooler. PDF: The Kelvin Temperature Scale